s aa gen cdf (civ design fundamental) (rev.0 2009)

8/2/2019 S AA GEN CDF (Civ Design Fundamental) (Rev.0 2009)

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S-AA-GEN-CDF (Civ Design Fundamental) (Rev.0-2009).doc Page 1 of 17

STANDARD TECHNICAL SPECIFICATIONS FOR ELECTRIC WORKS

GENERAL REQUIREMENTS

( SPECIFICATION )

CIVIL DESIGN FUNDAMENTALS

ADDC/AADC STANDARD : S-AA-GEN-CDF (REV.0-2009)


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Civil Design Fundamentals


CONTENTS

STANDARD TECHNICAL SPECIFICATIONS FOR ELECTRIC WORKS........................... 1

1 INTRODUCTION.......................................................................................................3

2 STANDARDS CODES AND REFERENCES FOR CIVIL WORK..........................3

3 MATERIALS...............................................................................................................5

4 GENERAL DESIGN GUIDELINES ..........................................................................64.1 Substations above 11 kV................................................................................................6

4.1.1 HSE Requirements ........................................................................................................9

4.2 Substations 22 kV and below.........................................................................................9

4.3 Distribution Lines........................................................................................................104.4 Underground Cables....................................................................................................10

5 DESIGN CRITERIA.................................................................................................115.1 Substations ..................................................................................................................11

5.2 Distribution Lines........................................................................................................12

5.3 Underground Cables....................................................................................................13

6 LOAD AND DESIGN ASSUMPTIONS ...................................................................146.1 General Assumptions...................................................................................................14

6.2 Seismic Load...............................................................................................................146.3 Crane load ...................................................................................................................14

6.4 Wind Load ..................................................................................................................15

6.5 Increase in Soil Bearing Capacity/ Pile Capacity..........................................................15

6.6 Under-Ground Water Retaining Structures...................................................................16

7 PARTICULAR SPACE REQUIREMENTS ............................................................16

8 ROADS, PAVEMENTS AND PARKING AREAS ..................................................16

9 BOUNDARY WALLS & PERIMETER FENCING................................................16


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CIVIL WORKS FUNDAMENTALS

The general information given hereunder applies to all civil works in addition to the General

Design Fundamentals, and unless specified in greater detail in sections on special conditions or

specific installations.

1 INTRODUCTION

The civil works are governed by the conditions of the electromechanical part, and as far as they

are not supplemented by data, by the conditions or specifications stipulated hereafter. However,any local laws and regulations shall prevail, such as the "Abu Dhabi Municipality Building

Regulation and Guide Lines for Structural Design (1994)".

Detailed execution features of the civil work are described in the relevant sections of the

Specifications.

This document shall represent the basic specification and information for calculating the lump

sum price of the works concerned, but they should not be considered to be a completedescription in every respect. Tender drawings indicate the intended layout of the works, but are

not to be taken as a complete and dimensional reference.

The price offered shall be understood as the total sum for the complete civil and finishing works

to suit the requirements and the functions of the Works concerned. Design and choice ofconstruction materials shall consider and ensure the reduction of future maintenance works, and

therefore, all civil elements shall be designed to minimise maintenance and to result in a durable

construction with a minimum design life of 40 years.

The Bidder/Contractor shall prepare all necessary design and detail drawings in accordance with

the Project requirements. However, the following guidelines design criteria shall be strictly

followed and applied in view of the proposed equipment, and are having priority over the Tender

drawing details.

2 STANDARDS CODES AND REFERENCES FOR CIVIL WORK

Except where otherwise stipulated, all civil works materials, tests of works, investigations on

Site, installation and construction methods, and also manufacturing procedures shall comply as a

minimum with the following codes and standards:


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EUROCODE CEN

European Committee for Standardisation

Central Secretariat

Rue de Stassart 36

B - 1050 Brussels

Belgium

DIN Deutsches Informationszentrum fr Technische Regeln (DITR) in DIN

Deutsches Institut fr Normung e.V.Burggrafenstr. 4 10

10787 Berlin

Tel. +49 (0)30 2601-0 / Fax 2601-1260

ACI American Concrete Institute

P.O. Box 4754, Redford StationDetroit, Michigan 28219, U.S.A.

ASTM American Society of Testing Materials

1916 Race Street, Philadelphia

Pennsylvania 19103, U.S.A.

AISC American Institute of Steel Construction

101 Park Avenue, New York

N.Y. 10017, U.S.A.

ASHRAE American Society of Heating, Refrigeration and Air-conditioning Engineers Inc.1791 Tullie Circle, N.E., Atlanta, GA 30329 USA

Phone: (404)636-8400, Fax: (404)321-5478

ASHTO American Association of State Highway and Transportation Officials,

444 North Capitol Street, Suite 249,

Washington, D.C. 20001, USA,

Tel: +1 202 624-5800

NFPA National Fire Protection Agency

1 Batterymarch Park

P. O. Box 9101,

Quincy, Massachusetts, USA

Tel: +1 617 770-3000, Fax: +1 617 770-0700

BS British Standard

CIRIA Construction Industry Research and Information Association

Abu Dhabi Abu Dhabi Municipality Building Regulation and Guide Lines for


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Municipality Structural Design (1994)

The Bidder/Contractor shall clearly identify in his offer which of the acceptable Standards shall

be applied during design and execution for each part of his works. Standards for one type of

materials shall be of the same grouping, i.e. only BS, DIN or ASTM. Only if the selected group

of Standards does not offer guidelines for specific parts of design or execution, alternative

standards may be proposed.

The Bidder/Contractor shall ensure that the design and execution of civil works adheres at leastto the minimum requirements based on BS.

Execution of concrete works shall normally either follow BS or DIN Standards. All concreteworks shall further be executed in line with the CIRIA publication Guide to the construction of

reinforced concrete in the Arabian Peninsular.

Structural Steel works shall normally be designed and executed according to EUROCODES 3

and 4.

Other Standards may only be applied after explicit approval through ADDC/AADC.

The Bidder/Contractor shall provide all required drawings for Town Planning Department, Civil

Defence, ADDC/AADC, Municipality and other Authorities, which are mandatory to obtain

required (building) permits.

In addition to the basic tendered design to be offered, the Bidder/Contractor may proposealternative type(s) of building and structures to be applied within the Project.

It is the Bidders/Contractors obligation to carry out complete Geotechnical Investigations to

determine all relevant soil conditions and parameters required for a sound and durable structural

design, including the bearing capacity of the ground to determine type and size of foundations

and to determine the chemical soil and groundwater aggressiveness.

3 MATERIALS

All materials proposed and their colours selected to be used within the Project shall be subject to

ADDC/AADCs approval and shall comply with the Technical Specification and the definedStandards.

Application of materials shall be in line with this Specification, but Manufacturers specific

instructions for the use and application of his material shall be complied with.

All work shall be executed by skilled workers in a workmanlike manner. Prior to the start of

execution the Bidder/Contractor shall verify that all conditions are suitable for the timely andeffective carrying out of his work.

Specified or requested testing of material shall only be carried out by a licensed office or institute

or an approved laboratory, conforming to accepted standards in accordance with the technical

data and approved by ADDC/AADC. Selection of samples for testing shall be made by

ADDC/AADC at Site.


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For site testing of fresh concrete, at least equipment equivalent to "Set B" of "Der Deutsche

Beton Verein e.V." shall be provided and used.

If no approved laboratory for the further testing of concrete materials is available, equipmentequivalent to that listed as "Set C or Set D" of "Der Deutsche Beton Verein e.V." shall be

provided in addition.

4 GENERAL DESIGN GUIDELINES

4.1 Substations above 11 kV1. Substations shall normally be designed as concrete skeleton structures. Walls shall be

made of insulated block/brick work or concrete panels of adequate insulation. The roof

shall normally be designed as flat concrete roof.

2. Foundations shall be designed according to the findings of the soil investigations and shall

consider the requirements of the buildings. In weak soils, pile foundations have to be

considered. Ground improvement, such as vibro compaction, vibro soil replacement, stone

columns, etc., may be proposed for ADDC/AADCs approval.

3. Cable basements shall be considered under all 11 kV, 22 kV, 33 kV switchgear rooms.

4. Raised modular flooring shall at least be foreseen for Control-, Protection-, LDC- & PLC-,Charger -, Telephone - & LV Station Supply Rooms.

5. The station design shall provide adequate provisions for offices, kitchen, toilets and storage

facilities, as further detailed within the scope of works.

6. A comprehensive HVAC System shall be provided for station.

7. Station ground level are to be defined according to local laws or to ADDC/AADC's

instructions, and unless specified otherwise. The minimum Station level shall be 50 cm

above any adjacent (within 250 m) asphalt road.

8. Finish floor level (F.F.L) shall not be less than 50 cm above external ground (station) level.

9. In general, the underside of basement slabs should not be deeper than 2.0 m below finalground (station) level, and should normally also be at least 30 cm above the highest ground

water level.

10. Minimum free height (clearance) of basements is to be 2.2 m in traffic areas/escape routes

after completion of all installations.

11. An adequate number of doors/emergency exits to comply with means of egress

requirements and sufficient loading spaces have to be provided.

12. Switchgear, Control and Auxiliary room walls not bordering transformer bays are to be

provided with glass blocks for daylight illumination. Fire rating of the glass blocks panels

shall be in accordance with the local regulations or NFPA, at least, however, 90 minutes.13. Installation of double glazed windows shall be limited to offices, kitchens and toilets.


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14. All basements/cellars and cable trenches to be executed with at least 1% slope towards

drainage points or pump sumps, which shall be provided for each section or at least at both

ends of the trench or basement.

15. Concrete roof slabs shall be provided with sufficient slopes (minimum 2 %), and proposals

for diagonal roof slopes of (1% towards rain water outlets) made by lean concrete may be

provided. Diagonal slopes of 1% are not required if a provision of gutter is adopted in the

design.

16. Normally a recessed/flush installation shall be foreseen for all cabinets and panels, e.g. for

indoor fire hose reels, breathing apparatus, fire extinguishers, annunciator/repeater panels,CO2 lock off units, alarm/detection equipment, etc.

17. A minimum slope of 1% and Floor Drains/Pits shall be provided in all rooms /areas, where

surface water may occur, e.g. the H.V.A.C. Plant Room, Fire Pump Room, Battery Rooms,

trenches, bathrooms, kitchens, and Insulator Washing Equipment Room, etc..

18. SWG/SVC-hall floors and the transformer/shunt reactor basements shall have rigid

foundations to minimise differential settlements. If separate basements are provided, the

Bidder/Contractor shall provide proof for the maximum settlements, and shall provide

sufficiently sized compensators in the Switchgear (GIS). Reference is made to the GIS

specification.

19. External block walls, roofs, aluminium or metal clad walls and roofs, as well as all doorsand windows of all building shall provide adequate thermal insulation and shall be

approved by ADDC/AADC. The thermal transmission coefficient U of walls, including allwindows and doors, shall be equal to or less than 1.2 W/(m2 *K).

20. Distances and room partitions shall be designed according to the specified fire protection

standards. The design layout shall follow the requirements of preventive measures as

outlined in the relevant sections.

21. Unless local regulation require differently, all fire rated doors shall be designed in

accordance with NFPA, and all reinforced concrete structure members (slabs, beams,

frames, columns, etc) shall be designed in accordance with DIN V 18230, DIN 4102, or

NFPA 220 type 1, table 3, and to withstand at least the below listed fire ratings:

Structure/concrete 180 min.

External walls 120 min.

Internal fire barrier wall 120 min.

Glass blocks 90 min.

Fire rated steel doors

Fire rating 90 min.


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Integrity/stability of insulation/core 20 min.

Raised floor 30 min.

22. Transformer foundations shall be designed as a solid block foundation (not separate

beams/walls) and reinforced properly for all straining action including the effects duringcasting and service life of the transformer.

23. Transformer bays/shunt reactor shall be designed and executed - in view of fire protection

and the required oil and water collection capacity - as follows: Double walls shall be used between transformer bays and building walls, whereby

both walls shall be designed as fire separation

Each transformer bay shall be enclosed by reinforced concrete fire protection walls

on three sides. All walls shall be at least 0.5 m higher than the highest transformer

part (e.g. top of tank). Design of the Bays, the Fire Walls, the Oil Tanks and the FireFighting equipment shall meet NFPA and local regulations

The capacity of the oil collection area incorporated in the foundation has to be

designed according to the oil capacity of the transformer as well as the maximum

expected fire fighting water

If specified and approved, joint oil/water separator tanks may be provided for groups

of transformer foundations. Reference is made to below listed sample drawing,which is provided in the Drawings Section.

Drawing No. Title

DWG AA GEN 01 01 Typical Oil Separator

If specified, transformer bays shall be covered by a light-weight roof construction

over the full bay ensuring shading, but not obstructing necessary ventilation and air

circulation. Costs for this construction must be clearly indicated in the BOQ/PTS.

24. Access to transformer bays shall be through lattice steel fences and doors/gates, with amaximum spacing of the lattice steel works of 7.5 cm. Fence, doors and frames shall be hot

dip galvanised after manufacture and welding, and shall be coated (corrosion protected) as

per the General Specifications Part :

S-AA-CORR - Corrosion Protection and Painting Color Codes

Alternatively, such gates and fences may be constructed utilising powder coated

aluminium sections and profiles.

25. Each substation has to be equipped with fire alarm and fire fighting systems, which meet

NFPA regulations.


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26. Wherever the soil investigation indicate a groundwater table within one (1) meter below

the lowest slab level, all reinforced concrete structures below ground level (e.g. basement

slabs & wall, trenches, etc.) shall be designed as water retaining structure in accordance

with BS 8007 and BS 8110. For substations within the City of Abu Dhabi, the ground

water level shall generally be considered at the finish ground level.

27. Cable trenches shall be designed and provided for the foreseen future extension of the

Station (including consideration of all MV, LV, HVAC, F/F. and control cables).

28. All cable recesses and openings to be provided for foreseen future extension (including

MV, LV and control cables) shall be made watertight and fire protected by an approvedmethod.

29. Provisional recesses and openings in floors of Switchgear, Control and Relay Rooms and

prepared for the foreseen future extension of the Station shall be covered by heavy duty

chequered plates, fire protected and if required thermally insulated.

30. Foundation and floor slab reinforcement shall have projecting galvanised earthing flags to

enable connection to the earthing grid of the Station.

31. All substation metalwork including transformer tank, cable screens, feeder pillar, doors and

any internal structural steel work shall be securely bonded together so that a firm metallic

connection existing between each of them and the substation earthing terminal.

32. External earth points as per requirement for equipment and system earthing shall also be

arranged to keep earth resistance to less than two ohms.

33. A/C unit mounted on roof / top roof shall be surrounded by screen walls ( i.e. clustra block,GRP, aluminium sections).

34. External/internal stair to roof/top roof to be provided.

4.1.1 HSE Requirements

Specifying emergency response equipment for substation buildings such as, but not limited to:

A. Breathing ApparatusB. First Aid Kits

C. Spillage Control Kits/Products

D. Fire Fighting Equipment, etc.

is a relative phenomenon depending upon the configuration of the substation building.

The type/nature of equipment used in the building, the normal/average occupancy of the building,

location of the building, etc.

4.2 Substations 22 kV and below

This section refers to additional, deviating specific civil works requirements related to theconstruction of Substations of the voltage level 22 kV and below.


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1. For the buildings, preference will be given to a standardised pre-fabricated scheme,

ensuring fast completion and maintaining the required high quality of works.

2. It may be noted that experience has proven that in the past in most cases, a bearingcapacity of 50 kN/m2 could in the past be assumed in Abu Dhabi, and 100 kN/m2 in Al

Ain.

3. For not air-conditioned stations, lattice steel doors ensuring adequate ventilation, shall be

provided. The minimum door opening shall be 3.0 m x 2.3 m.

4. For air-conditioned stations, doors for Switchgear rooms shall be double leaf, insulated

steel doors.

5. Thermal insulation of all walls, roofs, doors, glass blocks, etc. shall be adequately designed

and shall be approved by ADDC/AADC. The thermal transmission coefficient U of walls,including all windows and doors, shall be equal to or less than 1.2 W/(m2 *K).

6. All cables, ducts and conduits entering the Station shall normally be routed horizontally

and below ground level, Adequate provision shall be made to seal the cable entries against

ingress of water and to prevent animals, etc. from entering.

7. A/C unit mounted on roof / top roof shall be surrounded by screen walls ( i.e. clustra block,

GRP, aluminium sections).

8. External/internal stair to roof/top roof to be provided.

4.3 Distribution Lines

1. OHTL Tower foundations shall normally be designed as single-leg foundation, i.e. one

foundation per tower leg.

2. OHTL foundations shall reach at least (50-75) cm above the final ground level at the tower

location site.

3. If required, pile foundations shall be provided with permanent casings wherever the ground

down to the bearing strata is highly aggressive or cannot support the newly cast pile.

4. Whenever required for the execution of the works, access roads shall be provided by the

Bidder/Contractor.

5. Maintenance access roads may be ordered by ADDC/AADC along sections of the line.

4.4 Underground Cables

Civil works shall be carried out in line with the General Specifications Part and shall be subject

to approval by ADDC/AADC.


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5 DESIGN CRITERIA

Following fundamental design criteria shall be strictly followed and applied in view of the

proposed equipment, and are having priority over the Tender drawing details and dimensions.

5.1 Substations

1. Design Criteria to be submitted shall include a description of the following:

Soil investigations

Codes and standards to be adopted in the design Loading to be adopted for the various elements of the structure

Load factors and load combinations

Description of the design method and theories to be adopted.

2. Architectural scheme design

3. Base calculation of the structural design and general arrangement drawings shall include

the principle framing and loading calculations, as well as the information concerning theexpected forces in the relevant elements of the structure.

4. Architectural detail drawings (for Substations only) covering the electrical equipmentrequirements shall be co-ordinated with Mechanical, Electrical and Plumbing (MEP)

drawings and shall include the following:

Plans, elevations and sections detailed enough to enable construction without

difficulties

Stair case details

Roofing and water proofing detail

Doors and windows schedules

Finishing schedules.

5. Structural detail drawings shall include the following:

Detailed structural calculations for the analysis and the design of all members and the

full structure

General notes and typical detail drawings that are applicable the majority of works.Reference shall be made to the below listed sample drawing, which is provided in the

Drawings Section.

Drawing No. Title

DWG AA CIV 00 01 General Notes

Load drawings, showing all dead, equipment and live loads, including line loadsfrom walls


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Reinforcement details, bar bending schedules, following ACI simplified methods for

detailing, except where seismic/ductile connections are required

Concrete protection details

Structural steel details of all members, their welds and other connections

Coatings and corrosion protection details

Detailed lists of steel structure members, plates, bolts

Details of sheet metals and claddings for walls and roofs, etc.

Details of walls, stairs and other members

Formwork drawings/calculations shall be submitted for information.

The design procedure for the project shall be as described above, but not necessary limited to the

above and shall be approved by ADDC/AADC before proceeding.

5.2 Distribution Lines

1. Design criteria to be submitted shall include a description of the following:

Soil investigations

Codes and standards to be adopted in the design

Loading to be adopted for the foundations based on the approved Tower design

Load factors/load combinations for foundation and stub angle design

Description of the design method and theories to be adopted

Foundation tests to be applied and their details.

2. Base calculation of the foundation design and general arrangement drawings shall include

the principle loading calculations resulting from the tower design, as well as the

information concerning the expected forces in the relevant foundation.

Foundation forces along the slope of the tower leg and in the global axes shall be providedin a table format for all types of towers and their extensions.

3. Structural details shall include the following:

Detailed structural calculations of all members of the foundation showing that the

ultimate earth bearing capacity is not exceeded by the maximum pressure due to

loads, acting on the tower, multiplied with the corresponding safety factor, and due

to the dead weight of the tower and foundation

Prove that the uplift forces on the foundation do not exceed the weight of the fictive

anchor body in the soil, assumed to be in the shape of an inverted pyramid/conestarting 25 cm above the toe of the pile. Alternative, methods of design can be

adopted subject to ADDC/AADC approval


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Calculations and drawings showing the bearing capacity and stresses at each critical

section of the concrete and the steel reinforcement

Type of foundation selected for each tower location

Reinforcement details, bar bending schedules


Structural steel details of stubs and cleats

Detailed lists of steel structure members, plates, bolts, etc. for the stubs

Coatings and corrosion protection details for the stubs.

The design procedure for the project shall be as described above, but not necessary limited to the

above and shall be approved by ADDC/AADC before proceeding.

5.3 Underground Cables

1. Design criteria to be submitted shall include a description of the following:

Soil investigations

Codes and standards to be adopted in the design

Loading to be adopted for structure

Load factors and load combinations

Description of the design method and theories to be adopted.

2. Structural details shall include the following:

Detailed structural calculations of all members and structures

Type of foundation to be applied

Reinforcement details, bar bending schedules, prepared in line with ACI simplifiedmethods for detailing, except where seismic/ductile connections are required. These

have to be elaborated and presented in more detail.


Structural steel details of all elements

Detailed lists of structural steel elements, welds, plates, bolts, and other connections

Coatings and corrosion protection details

The design procedure for the project shall be as described above, but not necessary

limited to the above and shall be approved by ADDC/AADC before proceeding.


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6 LOAD AND DESIGN ASSUMPTIONS

6.1 General Assumptions

Further to the data given in the Section on General Design Fundamentals, the minimum

requirements for loads to be applied for the static analysis of both sub-and superstructure works

shall be as follows, whereby equipment and installation loads always shall be considered

additionally:

- Live load for building roofs

(A/C equipment and foundations to be considered additionally)1.5

kN/m

2

- Battery rooms, stores 10.0 kN/m2

- Control Rooms 5.0 kN/m2

- Switchgear Rooms 10.0 kN/m2

- Offices 5.0 kN/m2

- Kitchens, corridors, staircases, etc. 5.0 kN/m2

- Plant Rooms 10.0 kN/m2

- Additional dead load for suspended ceiling, pipes, AC system,

etc

1.0 kN/m2

- Roads and pavements, gutters SLW 60, DIN 1072

- Water tanks, septic tanks, etc. in road areas SLW 60, DIN 1072

6.2 Seismic Load

Static analysis shall be carried out for seismic loads calculated as static shear forces based onseismic coefficient of 0.075 in accordance with Zone 1 of Uniform Building Code (latest

Version). The Seismic Importance Factor shall be considered as 1.0. All other parameters must

be determined in accordance with UBC and highlighted in design criteria. Structural analysis and

design shall be started after approval of such parameters.

The buildings and structures shall meet the serviceability requirements of UBC.

6.3 Crane load

Vertical load will be considered for a maximum approach of crane hook towards the building

columns. An impact factor of 25% of wheel load shall be considered for design of crane girder.

Longitudinal surge forces parallel to the crane runaway girder shall be 5% of wheel load sharedequally on both sides.


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Lateral surge force (perpendicular to crane runaway girder) shall be 10% of lifted weight +

trolley weight.

6.4 Wind Load

Wind loads shall be calculated in line with BS-6399 Part-2. The maximum wind speed shall be

taken from the specification as defined under

S-AA-GEN-GDF - General Requirements: General Design Fundamentals

The site wind speed (Vs, as defined in BS-6399- Part2) shall be taken equal to the maximumwind speed as mentioned above. Other parameters shall be considered in line with above

mentioned standard for calculation of Effective Wind Speed and Wind Pressure. Load

Combinations

Following basic load combinations shall be considered in the analysis of framed structures forbuildings:

a) DL + LL + EL

b) DL+ LL+ EL+ CL.( Working condition)

c) DL+ 50%LL+ EL SL.x/z+ CL. (50% lift capacity + self weight of crane) Any bay may have crane.

d) DL + EL SL x/z

e) DL+ 50%LL+ EL + WL.x/z + CL. (50% lift capacity + self weight of crane) Any bay may have crane.

f) DL WL.x/z

g) DL + EL WL.x/z

DL = Dead Load

LL = Live Load

EL = Equipment Load

SL.x/z = Seismic load in X or Z direction

WL.x/z = Wind Load in X or Z direction

CL = Crane Load

For the design of buildings with crane, the longitudinal frame shall suitably consider surge loads

in longitudinal direction, from crane.

6.5 Increase in Soil Bearing Capacity/ Pile Capacity

For load combinations with wind and seismic loads, soil bearing capacity can be increased by

25% over the values mentioned in the Soil investigation report.

For load combinations with wind and seismic loads, pile capacity can be increased by 25% as per

pile design.


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6.6 Under-Ground Water Retaining Structures

Water retaining structures below ground shall be analysed considering earth outside with ground

water up to the maximum assumed level, but no water inside. Additionally, a surcharge load of2000 kg/m2 shall be considered for structures located very near to roads, or else a surcharge load

of 1000 kg/m2

shall be considered. In case the structure has compartments, the structure must be

analysed for the condition that water is present in one compartment only.

Earth pressure for under ground structures will be calculated using coefficient of active earth

pressure (Ka) or earth pressure at rest (K0) depending on boundary condition.

Reinforced concrete members shall be designed with a crack width not more than 0.2 mm inaccordance with BS 8007.

7 PARTICULAR SPACE REQUIREMENTS

Dimension of Switchgear rooms, and control rooms shall be determined under full consideration

of the equipment requirements and listed in the relevant part of the Specification.

Pipes, lighting installations, air conditioning ducts and glass block panels have to be located in a

way that sufficient (shadow-free) lighting is provided after completion of all installations.

8 ROADS, PAVEMENTS AND PARKING AREASRoads within the substation limit shall be either concrete or asphalt roads of at least 6.0 m widthwith kerbstones on both sides. Around all buildings, curb-stones and walkways in interlocking

tiles shall be provided. Road radii in relation to the outer curb shall not be less than 21.00 m.

sufficient slopes for surface water drainage of all paved areas shall be provided.

For paved and marked parking areas, suitable passage and kerbstone shall be arranged with at

least 1.00 m distance to the nearest building.

The construction of an asphalt access road from the end of internal roads inside the station

boundary to the nearest external road and as detailed in the scope of works shall be included in

the scope of works, unless explicitly stated otherwise in the scope of work. Road widths here

shall be at least 7.5 m. The road section shall be as per Municipality/Town Planning approval,

with kerbstones, shoulders and/or 1.5 m wide walkways on both sides. The roads are to be

designed for loads of SLW 60 (DIN 1072).

9 BOUNDARY WALLS & PERIMETER FENCING

Where specified, Boundary Walls shall be arranged at the perimeter of the plot. The boundary

walls shall be at least of 2.75 m high, and made of pre-fabricated concrete panels of

approximately four (4) meter length painted from both sides . At the top of the boundary wall,

100 mm height of spikes option shall be fixed of metal strip encased/fixed on top the panel.

Boundary walls shall normally be arranged at a distance of not less than 1.5 m from the plotlimits unless specified differently in the scope of works.


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S-AA-GEN-CDF (Civ Design Fundamental) (Rev 0-2009) doc Page 17 of 17

On filled plots (or plots to be filled) the boundary wall shall keep a distance of at least 3 m from

the edge of fill, where it has reached the final fill level.

Alternatively, ADDC/AADC may specify security fencing around the plot. Such fence shall beat least 3.00 m high chain link or if approved or specified within the scope of works - mesh

fence, with additional arms for four strands of barbed wire at the top. The bottom of the fence

mesh shall be encased in a ground beam.

For every plot, at least two entrance gates have to be arranged within the boundary wall orsecurity perimeter fence. Each gate shall be a double winged road gate of at least 6.0 m clear

opening, with a separate pedestrian gate of 1.2 m width each. Transportation requirements for theequipment may require larger openings and have to be considered.

Boundary wall shall be provided with external type of light fitting

For details, reference shall be made to the below listed drawing and specifications, provided in

the Civil Drawings Section:

Drawing No. Title

DWG AA CIV 13-03 Details of Pre-Cast Boundary Wall

Specification Title

S-AA-CIVIL-FENCE Security Fencing

s aa gen cdf (civ design fundamental) (rev.0 2009)

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