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EC/OCT2012/ECS318

UNIVERSITI TEKNOLOGI MARA FINAL EXAMINATION

COURSE

STRUCTURAL CONCRETE DESIGN

COURSE CODE

ECS318

EXAMINATION

OCTOBER 2012

TIME

3 HOURS

INSTRUCTIONS TO CANDIDATES 1.

This question paper consists of four (4) questions.

2.

3.

Do not bring any material into the examination room unless permission is given by the invigilator. Please check to make sure that this examination pack consists of: ) ) )

the Question Paper an Answer Booklet - provided by the Faculty Design Appendix - provided by the Faculty

DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO This examination paper consists of 6 printed pages © Hak Cipta Universiti Teknologi MARA

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2

EC/OCT2012/ECS318

QUESTION 1 a)

There are two types of partial factor of safety that is considered in the design process which are partial factor of safety for loads and partial factor of safety for materials. In your own words, explain why partial factor of safety for loads are considered in the design process. (3 marks)

b)

List two types of limit states that are considered in the design process. (2 marks)

c)

Figure Q1 shows a plan view of a building. Listed below are the design data: Concrete class Characteristic strength of main reinforcement, fyk Exposure condition Fire resistance requirement Main reinforcement bar, 0 bar Shear reinforcement, 0[ink Size of beam, b w x h Slab thickness, hf Structural class

= C25/30 = 500 N/mm2 = XC1 = R90 = 20 mm = 8 mm = 2 0 0 x 4 0 0 mm =125 mm = S4

Characteristic permanent action (without self-weight) on beam B/1-4 = 10.5 kN/m Characteristic variable action on beam B/1-4 = 9.5 kN/m i)

Calculate the ultimate load acting on beam B/1-4. Compute and sketch the shear force and bending moment diagrams. (5 marks)

ii)

Compute the effective flange width for the beam B/1 -4. Design the bending reinforcement under maximum positive moment. (10 marks)

iii) Sketch the cross-sectional view showing the arrangement of reinforcement for mid-span. (5 marks)

© Hak Cipta Universiti Teknologi MARA

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EC/OCT2012/ECS318

3

A

B 4000 mm

4000 mm

3500 mm 2

v

/\

3500 mm w ~?\ 3500 mm JL Figure Q1

QUESTION 2 A layout plan of beams and slabs for the first floor of a reinforced concrete building is given in Figure Q2. The concrete for the slabs and beams are cast together. Using the data design provided, Slab depth Finishes, ceiling, partitions etc. Density of concrete Variable load (computer room) Characteristic strength of concrete, fa Characteristic strength of steel, fyk Nominal concrete cover

= = = = = = =

150 mm 1.0kN/m2 25 kN/m3 5.0 kN/m2 25 N/mm2 500 N/mm2 25 mm

a)

Calculate the ultimate design load acting on slab panel 1-2/B-C. Hence calculate all the values of bending moments for the panel. Draw the bending moment diagrams for both directions. (8 marks)

b)

Design the reinforcement required for bending at mid-span of the shorter span of panel 1-2/B-C. Assume 0 b a r = 10 mm. (7 marks)

c)

Check whether the slab depth of 150 mm is sufficient to resist deflection. (6 marks)

© Hak Cipta Universiti Teknologi MARA

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d)

EC/OCT2012/ECS318

Sketch the reinforcement details for plan and cross sectional views. (5 marks)

6m f^

4m ^ = — — -

Meeting room

5m -==\$-

Office room

10

drop 50 mm *

=T

Computer room

4-

¥ Balcony

4 Figure Q2

© Hak Cipta Universiti Teknologi MARA

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5

EC/OCT 2012/ECS318

QUESTION 3 A braced column shown in Figure Q3 with the dimensions of 350 x 400 mm is subjected to a design moment of 55 kNm (bend towards minor axis) and carries an ultimate axial load of 2900 kN. The materials used are concrete class C35/45, characteristic strength of steel of 500 N/mm 2 . The exposure condition is XC1 and fire resistance of R60 is required. a)

Carry out a calculation on the slenderness ratio and categorize whether the column is short or slender. (10 marks)

b)

Design the main reinforcement and links for the column. (10 marks)

c)

Sketch the arrangement of reinforcement provided in the column. (5 marks)

Beam size (b x h) 300 x600 mm

A v

Lbeam = 4 m

3.5 m ->

<-

350 mm

Beam size (b x h) 300 x 600 mm

v

A V

Lbeam = 4 m

Figure Q3 350 mm

K d' = 50

H

±

A

400 mm

>|

K

v d' = 50

Column cross section © Hak Cipta Universiti Teknologi MARA

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EC/OCT2012/ECS318

6

QUESTION 4 A short braced column with 200 mm x 200 mm cross-section is carrying an axial load, N of 450 kN characteristic permanent action and 200kN characteristic variable actions as shown in Figure Q4. The column is rested on a pad footing of 300 mm thick. The safe bearing pressure on the soils is 150 kN/m2 and the characteristic material strengths are fck= 30 N/mm2 and fyk= 500 N/mm2. Given the concrete cover = 35 mm and 0 bar = 16 mm. Base on prescriptive design method, a)

Identify the size of the footing to resist the load. Assume the footing weight as 50 kN. (4 marks)

b)

Take a base size as a 2 meter square, design the bending reinforcement of the pad footing. (8 marks)

c)

Check the strength of the pad footing against punching shear. (8 marks)

d)

Sketch the reinforcement detailing. (5 marks)

200 mm x 200 mm column

300mm

Figure Q4

END OF QUESTION PAPER

© Hak Cipta Universiti Teknologi MARA

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## universiti teknologi mara final examination course ...

COURSE CODE. EXAMINATION. TIME ... Answer ALL questions in the Answer Booklet. Start each answer ... Density of concrete. Variable load (computer room).

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