Design and Drawing of Reinforced Concrete Structures - May 2015

MU Civil Engineering (Semester 8)

Total marks: --
Total time: -- INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary 1 (a) Figure below shows a typical framing plan for a office building. The design live load is 4KN/m² and floor finish load is 1.5KN/m². All external beams and beam Bm4 and Bm10 are supporting 230 mm thick brick wall. Floor to floor height is 3.2m. Grade of concrete M20 and steel Fe415. All columns are 300 mm × 300mm in size.
Design and draw suitable sketches showing designed reinforcement for,
a) slab sb₁-sb₂
b) Beam Bm₇-Bm₈
Draw to the scale suitable sketches showing designed reinforcement. 40 marks

1 (b) Design by approximate method a rectangular R.C.C water tank 6.0m × 4.0m in plan and 3.3m in height. Tank is resting on firm ground. Design side walls and base slab. Grade of concrete is M 25 and steel is Fe 415. check the design for safe stresses. Draw plan @ 1.0m above base showing reinforcement. Also draw necessary sections showing reinforcement detail. 40 marks

1 (c) Explain with sketches various types of joints for water tanks. 40 marks

2 Design a dog legged staircase for a office building as shown in figure given in Q No1. Also show arrangement of flights giving details. Draw reinforcement details for both flights. Use M20 grade concrete and Fe415 steel. 40 marks

3 A reinforcement concrete cantilever retaining wall is supporting a backfill of height 4.2 m above ground level with, density of soil=16.5 kN/m³, Angle of repose=30°, S.B.C of soil=195 KN/m² and coefficient of friction between concrete and soil=0.45 design stem and toe of wall and show all stability checks. Draw reinforcement details of toe and stem showing curtailment of reinforcement. Use M25 grade concrete and Fe500 steel. 40 marks

4 (a) Design a circular water tank using IS code method for the capacity 350m³. Depth of water in tank is limited to 4.0m including free board. The connection between wall and base slab is rigid. Use M25 grade concrete and Fe 500 steel. 40 marks

4 (b) 1) Explain when following types of foundation are preferred-
1. Isolate footing
2. Combined footing
3. Raft foundation
2) Explain with neat sketch difference in the behavior of cantilever and counterfort type retaining walls. 40 marks

5 Design and draw with the data given Q No.1. Raft foundation as shown in figure by doted line supporting the columns with working loads as given below. Net bearing capacity =65 with
A1,A,C1 & C3=800 kN
B1,A2,B3 & C2=1000 kN
B2=1600 kN.
Refer PDF for Tables 40 marks