calculation note 29 11-2014

Calculation Note

SUEZ CEMENT COMPANY-SCC

FOUNDATIONS AND RETAINING WALLS

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Table of Content: PAGE

I- Introduction and General Design Notes---------------------------------------------------2

Introduction--------------------------------------------------------------------------------------3

1-General Design Notes-----------------------------------------------------------------------3

1.1-Design Method and Standards----------------------------------------------------------3

1.2 –Loads----------------------------------------------------------------------------------------3

1.3-foundation conditions--------------------------------------------------------------------4

1.4 -Specifications of Materials--------------------------------------------------------------4

II-Mechanical Drawings---------------------------------------------------------------------------5

III-Conveyor Foundation Design---------------------------------------------------------------12

IV- Retaining Wall and strap footing Design------------------------------------------------29

VI-Design Drawings--------------------------------------------------------------------------------49

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Introduction and General Design Notes

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Introduction This report has been prepared for structural design of conveyor and storage area foundations, retaining

walls and slab on grad ,its popose to briefly describe the the structural system, names of various

applicable codes of structural engineering practice are mentioned, the design criteria are described in

detail including all types of gravity loads to be considered in design, Methods of structur al analysis and

design to be followed are explained with reference to the use of personal computer in organizing all

calculations, The types of structural materials and their corresponding strengths are mentioned briefly.

All the design procedures were done by taking into account the Egyptian code Specifications

Foundation type is selected as single and combined footing for conveyor and as strap footing for retaining

walls.

Plan dimensions of foundations are determined by taking into consideration the soil bearing capacity

which is defined by geotechnical site research.

This structural system has been designed by using Excel sheets , MathCad and static analyze programs

SAP2000 and SafeV.12

1-General Design Notes

1.1 Design Method and Standards:

The design and works shall comply with:

Loading

If no higher loads will be requested by the Client or by the Supplier, the loads shall be applied based on

the Egyptian Code for 'Computation of Loads and Structural Forces & Building.

Reinforced Concrete

The design method to be taken into consideration is the limit state design method, covering the Egyptian

Code of Practice for the design of reinforced concrete as well as the load specifications.

Foundation

The design of the foundation concerning safety against overturning, uplift and sliding has to be

established according to the Egyptian Code Volume 3 'Shallow Foundations'

1.2 Loads

Load categories

1.2.1-Dead load (permanent loads)

Dead load of deck, equipment, lining and other well -defined installations (in terms of both load and

location).

1.2.1.1 Dead loads / weights

Working values of dead loads:

o Concrete, un-reinforced 24 kN/m3

o Concrete, reinforced 25 kN/m3

o Soil, for soil pressure 20 kN/m3

o Soil, for stability 18 kN/m3

1.2.2 -Live loads, normal (variable loads)

Normally occurring loads from e.g. plant operators, furniture and equipment, traffic, material (stored,

transported, occasional accumulations,dust, fillings, etc.).

When a dynamic load is approximated to an additional static load, this additional load, which stems from

normally occurring conditions of impacts and vibrations, is included in this load category.

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1.2.3 -Loads from meachinery and equipment(variable loads)

The working loads as shown on mechanical drawings, these loads include nature loads like wind and

seismic loads.

1.3-foundation conditions

The soil condition and foundation recommendations are spcified in the geotechnical investigation report

the allowable net soil pressure are recommended as 250 kN/m2

In case of design due to permeanent and probabilistic/dynamic Loads of either wind or eart hquake the

maximum net soil pressure can be increased by 20% either on Serviceability Limeit States/allowable or on

Ultimate Limit State/design whenever is more economical for the foundation design.

1.4 Specifications of Materials

1.4.1 Reinforced concrete

Material properties of concrete:

The concrete grades for foundations and structures have to be as follows :

Concrete class Concrete designation 28days standard compresseve strength

cube 150*150*150 mm Application

A Fcu 350 350 kg/cm3 Grouting

B Fcu 300 300 kg/cm3 Reinforcement

concrete

C Fcu 200 200 kg/cm3 Plan concrete

Thermal expansion coefficient = 10-5 per ° C. Poisson's ratio of concrete = 0.2

Material properties for reinforcement:

Rebars complying with the requirements of Egyptian Standard 262 (steel bars for concrete reinforcement)

can be used, provided, that its characteristics shall be considered in design. The following indicates the

characteristics of the Egyptian steel.

Type of steel Yield stresses (fy N/mm2)

Ultimate design strength (Fu N/mm2)

Min elongation

Deformed bars 400/600 (ribbed high grade steel)

400 600 12%

smooth bars 240/350

(normal mild steel) 240 350 20%

Elastic modulus: ES = 200'000 N/mm2

Following diameters of deformed bars shall be used for the design: Y 10, 12, 16, 18, 22, 25.

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II-Mechanical Drawings

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III-Conveyor Foundation Design

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3.1 Design of Conveyor Foundation

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Design using Excel Sheets

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Check Design using MathCAD Sheet

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Design Combined footing F4 using Safe program

Loads input

Check Stresses under Foundation in each Load combination

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F4- Rienforcement

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Design F6 using Safe program

Loads input

Check Stresses under Foundation

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F6- Rienforcement

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IV- Retaining Wall and strap footing Design

4.1 Retaining Wall Design using Sap 2000 program

3D View

Steel Columns and moving Floor Loads

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Earth pressure Loads

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Uniform Loads

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Deformed Shape

Check stresses Under Strap Footing

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Check stresses Under Strap Footing

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Check stresses Under Strap Footing

Strap Footing Rienforcement using Y12@150mm in X direction

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Strap Footing Rienforcement using Y12@150mm in Y direction

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Wall horizontal Rienforcement using Y12@150mm

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Wall vertical Rienforcement using Y12@150mm

For the structure model, the program SAP v. 14.1 was used, which is based on the finite element method.

The finite element model consists of a main truss carrying the conveyor supported on truss towers

The main truss modeled as continuous top and bottom chords members with bracing members ha ve pinned ends.

The truss towers modeled as continuous columns with bracing members have pinned ends.

The loads are introduced in the model using nodal, frame and shells loads.

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Wall 4 horizontal Max moment

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Wall 4 vertical Max moment

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Wall 4 top Beam Max moment

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Design of Wall 4 top Beam

Design of Wall 4 vertical and horizontal rienforcement

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VI-Design Drawings

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