Third Semester M.E. (Civil) (Structural Engg. PSC/Earthquake) Degree Examination, January 2015 2K8SE 302 : ADVANCED DESIGN OF BRIDGES
Time : 3 Hours
Max. Marks : 100 Note : 1) Answer any four full questions. 2) Assume any missing data suitably. 3) Use of IRC codes and IS codes and charts are permitted.
1. Design a RCC Tee beam girder bridge to suite the following data Clean width of roadway = 7.5 m Span = 16 m Live load : IRC class AA tracked vehicle Average thickness of wearing coat = 80 mm Concrete mix : M25 grade Steel : Fe 415 grade using Courbon’s method, compute the design moments and shear and design main girder and sketch the reinforcement details. 2. a) Outline the steps involved in the design of prestressed concrete bridges.
25 10
b) Design a deck slab for the following perticulars Clear span = 5.5 m Width of the foot path = 1 m on either side Wearing coat = 100 mm Loading : IRC class AA (Tracked) Materials : M35 concrete and Fe415 Steel.
15
PED – 084
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*PED084*
3. a) Explain in detail the different types of anchored system in Cable Stayed bride.
10
b) A reinforced concrete slab deck for a culvert of effective span 6.5 m is 500 mm thick with two lane road way 7.5 m wide and footpath 1m wide. Height of kerb = 300 mm. Wearing coat is 100 mm thick with asphalt concrete. If M20 grade concrete in used in the deck slab. Compute the natural frequency of the slab deck and check for the safely of the deck against failure due to dynamic effect.
15
4. Design an elastomeric pad bearing to support a Tee-beam girder of a bridge using the following data Max dead load reaction per bearing = 300 kN Max live load reaction per bearing = 700 kN Longitudinal force due to friction per bearing = 45 kN Effective span of the girder = 16 m Estimated rotation at bearing of the girder due to dead and live load = 0.002 radians. Use M20 grade concrete. Total estimated shear strain due to creep, shrinkage and temperature = 6×10 –4. Fig. 5 shows the section of a stone masonry abutment used for a highway bridge together with the forces acting per unit length of abutment. SBC of soil = 150 kN/m2 Coefficient of friction between masonry an soil =- 0.5
25
*PED084*
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PED – 084
Density of stone masonry = 25 kN/m3. Compute the stresses developed at the base and check for the stability of the abutment.
25
6. Write short notes on :
(5×5=25)
a) Expansion joints. b) Types of piers. c) Fly overs. d) Discuss about dynamic response of bridge. e) Explain Courbon’s theory. __________________
5 shows the section of a stone masonry abutment used for a highway. bridge together with the forces ... Main menu. Displaying Advanced design of briges.pdf.
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