Hall Ticket No:
Question Paper Code: A1141
(AUTONOMOUS)B. Tech VIII Semester Supplementary Examinations, May 2018
(Regulations: VCE-R11/R11A)ADVANCED STRUCTURAL DESIGN
(Civil Engineering)Date: 01 May, 2018 FN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.
A RCC retaining wall with counter forts is required to support earth to a height of 7m above ground level. The top surface of the backfill is horizontal. The trial pit taken at the site indicates that soil bearing capacity 220kN/m2 is available at depth of 1.25m below the ground level. The weight of earth is 18kN/m3 and angle of repose is 30o. The coefficient of friction between concrete and soil is 0.58.use M20 concrete and steel grade Fe415. Design the retaining wall.
15M
2.
Design a rectangular water tank 5m X 4m with depth of storage 3m. resting on ground and whose walls are rigidly joined at vertical and horizontal edges. Assume M20 concrete and Fe415 grade steel. Sketch the details of reinforcement in the tank.
15M
Unit II
3.
Design a concrete chimney of height 70m with the external diameter of the shaft being 4m at top and 4.8m at the base is required to withstand an intensity of wind pressure of 1.8 kN/m2. The thickness of the concrete shell at top is 200mm and 400mm at the base. The thickness of brick lining is 100mm with an air gap of 100mm. The temperature difference between inside and outside the chimney is 70o . Permissible bearing pressure on the soil is equal to 200kN.m2. Unit weight of bricks is 20kN/m3. Use M25 concrete and Fe 415 steel. Design the reinforcement for the chimney. Sketch the reinforcement details.
15M
4.
Design the side wall of a rectangular bunker of 250mm depth to resist a moment of 33KN-M using M20 concrete and fe 415 steel. Sketch the reinforcement details.
15M
Unit III
5.
a)Explain the various factors to be to be considered involved in the design of steel truss bridges.
7M
b)Design a deck type welded plate girder bridge to suit the following data:
Effective span of the girder 32m
Dead load Open floor) 8.0 kN/m
Equivalent total live load for BM
Calculations/ track 3000 kN.
Top of rail level 108.00
Side slope of embankment 1.5 1
Foundation level 100.50
Width of abutment 4m
Design the main plate girder with intermediate and bearing stiffners and lateral bracings. Sketch the details of plate girder.
8M
Cont…2
2
6.
a)Design a steel truss bridge to suit the following data:
Effective span 25m
Road way 7.5m two lane)Kerbs 600mm
Loading IRC Class AA tracked vehicles
Material M20 concrete and Fe415 steel for deck slab. Rolled steel sections with fy =230N/mm2. Sketch the details of truss bridge.
8M
b)List and explain the various possible failures of steel truss railway bridges with neat sketches.
7M
Unit IV
7.
a)Briefly discuss the economic span for bridges.
7M
b)Explain the various components of a bridge.
8M
8.
A reinforced concrete simply supported slab is required for the deck of a road bridge having the following data.
Clear span 5.5m
Width of carriage way 7.5M
Foot path on either side 1m wide
Materials M20 concrete and Fe415 steel
Type of loading IRC class AA. Design the deck slab. Show the reinforcement details.
15M
Unit V
9.
a)What are the measures one can take for the improving the ductility of a reinforced concrete structure.
8M
b)What are the objectives behind the special detailing provisions?
7M
10.
What are design requirements of beam column joints in earthquake resistant design?
15M