design & drawing of rc structures jan 2014

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Sixth Semester B.E. Degree Examination, Dec.2013 lJan.2ol{Design and Drawing of RG Structures

Time: 4 hrs. Max. Marks:100

Note: 7. Answer anJ) TWO full questions from Part-A und ONE question from Pqrt-&.,..2. (Ise of 15456-2000 and SP-16 is permitted.'r. Ot,tru e missing data suitarrl.r_^

I Prepare a centre line drawing showing foundation layout for columns and walls of a buildingshown in Fig.Ql. Size of footing for column Cr : 1 .2m xl.5m and fur column Cz :1.0m x 1.0m.Concrete bed for footing is 100 mm thick and project 75 mm beyond the footing. Width offoundation trench foi wails = 900 mm and for corridor basement = 0.5m. Also draw the slab andbeam layout with suitable dimension and notations.

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:' Fig.QlRectangular RC beam.of'Cross-section 300 x 450 mm is supported on four columns which are

equally placed at 4 m centre to centre. The columns are 300mm- x 350mm with 8 bars of 12 mmand stirrups of 8 mm diameter at 250 c/c. The beam reinforcement consists of 4 bottom bars of20 mm at midspan and top hanger bars of diameter 72 mm two nurl,rbers throughout the beam.The additioaal reinforcement at all supporls (-ve reinforcement) : 3 baqs of 16 mm diameter.Two bars of positive reinforcement have been curtailed near each support. Vertical stirrups of8 mm diameter are placed at230 mm c/c. Use Mzo concrete and Fe 415 grade steel. Draw thelongitirdinal section of continuous beam and cross sections of beam at midspan, support sectionsand column section as well. Give the bar bending schedule for the beam. (20 Marks)

3,,,, The dog legged stair of a building provided in between ground and first floor of height 3.3 m has

the following details:Size of stair room : 25mx 4.5m Thickness of stair hall wall: 300 mmThickness of waist slab: 160 mm Area of main steel required: 900 mm2

M26 grade concrete and Fe 415 steel are used.Draw:a. Plan showing geometry of the stairb. Sectional elevation of each flightc. Bar bending schedule.

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(20 Marks)

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PART - B

Design a counterfort retaining wall for the following details :

Height of wall above ground level: 5.20 mSafe bearing capacity of soil: 180 kN/m2Angle of repose of the soil: 30o

Coefficient of friction between soil and concrete : 0.50

Unit weight of soil: 16 kN/m3Use Mzo concrete and Fe 415 grade steel.

Draw to a suitable scale;

a. Cross section midway between counterfortsb. Crois section througir counterforts.c. Sectional'elevation.d. Sectiondl,lilan.

Design a portal fiame having an effective span of 9 m and an effective height of 4.50 m. Theportals are spaced at:3"5 m c/c. The imposed load on slab iS 3 kN/m2. Assume SBC of soil as

125 kNim2. The base of columns are fixed. Use Mzo concrete and Fe 415 grade steel. Adoptdepth of slab : 125 mB, size of column 300mm x 450mm and size of beam :300mm x 600mm. Floor finish =",0.'15 kN/m2,'.prn* to a suitable scale

a. Sectional elevation showing details of reiffircement in beam columns and footings.b. Sectional elevation of slab shoWin$.details of reinforcement in slab.

c. Cross section of beam and colurln':a1 important sections.

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(60 Marks)

(60 Marks)

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design & drawing of rc structures jan 2014

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