۸ 03000300 01 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Fifth semester B.Tech degree examinations (S) September 2020

Course Code: CE301
Course Name: DESIGN OF CONCRETE STRUCTURES I
Max. Marks: 100 Duration: 3 Hours

Use of IS 456-2000 is permitted

PARTA
Answer any two full questions, each carries 15 marks. Marks
1 ച Why are over reinforced sections not used in practice? (5)

b) A concrete beam has 300 mm breadth and 500 mm effective depth; effective (10)
cover 50 mm, reinforced with 3 nos. 20 mm diameter steel bars at tension side.
M20 concrete and Fe 415 grade steel are used. Determine the moment of
resistance.
2 a) What is the purpose of providing development length? (5)
b) Design the shear reinforcement for a beam section of width 200 mm லாம்‌ (10)
effective depth 500 mm. The factored shear force is 100 KN and it is reinforced
with 3 Nos 16 mm diameter bars on the tension side at the critical section. Use

M20 concrete and Fe 415 steel.

3 ஐ Explain characteristic strength of concrete and steel. (5)
b) Explain with figure the stress strain relationship of mild steel. (5)
c) Explain anchorage of reinforcing bars. (5)
PART छ
Answer any two full questions, each carries 15 marks.
4 8) What are T and L beams? (5)

b) Design a rectangular beam section of width 200 mm to resist a bending moment (10)
of 30 kNm. Use M20 concrete and Fe 415 steel.
5 ஐ Differentiate between one way and two way slabs. (5)
b) Design a one way slab with 3.5 m clear span supported on 230 mm thick walls (10)
on all four sides. The edges are simply supported. The live load on the slab is 2
kN/m?. Use M 20 concrete and Fe 415 steel.

6 9) When do you require a doubly reinforced beam? (5)

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