This question paper consists of four (4) questions.
2.
Answer ALL questions in the Answer Booklet. Start each answer on a new page.
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
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
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)
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)
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)
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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