STUPIDSID
1(a)
Explain P-line and C-line with neat sketches.
4 M
1(b)
A simply supported prestressed concrete beam 350mm×800 mm has span of 10m and supports a live load of 25 kN/m. The beam is post tensioned by cable having cross sectional area 1200 mm2. The cable eccentricity is zero at support and varies parabolically to 250 mm at the mid-span. The initial prestressing force is 1350 kN and loss ratio is 0.78 determine the stresses at transfer and service condition at mid span. Take unit weight of presressed concrete as 24 kN/m3.
6 M
2(a)
Explain the concept of prestressing a structural element. Also explain pretensioning and post tensioning methods with neat sketches.
6 M
2(b)
The overall dimension of an end block of a post tensioned beam is 400mm×800mm. The girder is prestressed by a signle cable comprising of 12 strands. The strands used are 12.7 mm; 7-ply strand with the nominal area of 92.9mm2 and breaking load of 160 kN as per IS 6006. Design the bearing plate given that fck = 35 MPa and fci = 28MPa.
4 M
Solve any one question from Q.3(a,b) & Q.4(a,b)
3(a)
Determine the ultimate moment of resistance of a post tensioned box section having bonded tendons. The box section has outer dimensions of 750mm×1200mm and inner dimensions of 550mm×800mm. The total cross sectional area of the tendons is 1000 mm2 with the centroid at the distance of 100 mm from the soffit. Take fck = 40MPa, fp =1800 MPa and f fpe = 0.7 f p.
4 M
3(b)
A four storey buildings has the following data:
Overall plan dimension = 20m&16m
Number of bays 4m each in X direction = 5
Number of bays 4 m each in Z direction =4
First storey height =4m
Height of 2nd , 3rd, and 4th storey = 3.0m
Size of beams = 300 mm× 600mm
Size of coumns = 500mm×400,mm
Slab thickness =150 mm
Live load = 3.5 kN/m2 on floors and 2kN/m2 on proof
External masonary walls of thickness 230 mm and internal walls of 115 mm thickness have been provided.
Building loacated in Pune on hard strata with 5% damping evaluate the seismic weight of each floor and hence total seismic weight of building calculate the base shear using seismic coefficient method.
Overall plan dimension = 20m&16m
Number of bays 4m each in X direction = 5
Number of bays 4 m each in Z direction =4
First storey height =4m
Height of 2nd , 3rd, and 4th storey = 3.0m
Size of beams = 300 mm× 600mm
Size of coumns = 500mm×400,mm
Slab thickness =150 mm
Live load = 3.5 kN/m2 on floors and 2kN/m2 on proof
External masonary walls of thickness 230 mm and internal walls of 115 mm thickness have been provided.
Building loacated in Pune on hard strata with 5% damping evaluate the seismic weight of each floor and hence total seismic weight of building calculate the base shear using seismic coefficient method.
6 M
4(a)
How are lateral loads analyzed in multistoried buildings? Explain any one method.
4 M
4(b)
Design the three span continous beam PQRS for combined effect of lateral and gravity loads for flexure only. The three beam have equal span of 5m. The design data for the beam is Mp (-)= 88.07 kNm; MQ(-) = 137.92 kNm; MPQ (+)= 84.41 kNm and MQR(+)= 61.45 kNm. Moments due to lateral load is 108 kNm.Draw the details of reinforcement as per IS 13920.
16 M
Solve any one question from Q.5& Q.6
5
A T-shaped retaining wall is to be provided to retain a horiziontal leveled backfill of height 4.5m. The backfill has unit weight of 17 kN/m3, angle of repose = 30°, coefficient of friction between concrete and soil =0.55, SBC of soil = 180kN/m2, depth of foundation = 1.0m. Perform stability analysis and design the stem. Sketch the inforcement along with curtailment of reinforement.
16 M
6
Desing an inverted L-Shaped retaining having steam and toe to retain a backfill of 2.8m. The backfill is horiziontal and the unit weight of the soil is 17kN/m3, angle of repose = 30° SBC of soil = 180 kN/m2, good foundation is available at a depth of 1.0m. Design and sketch the details of reinforcement in the wall and toe slab
16 M
Solve any one question from Q.7& Q.8
7
Two columns C1 and C2 of size 400mm×400mm are spaced at 3.0m apart carrying a service load of 650kN and 80kN respectively. C1 is boundary column, Design a slab beam type combined footing. Safe bearing pressure on soil is 180 kN/m2. Use M30 grade of concrete and steel of grade Fe 500.
16 M
8
Design a slab type combined footing two columns spaced 3m apart carrying a service load of 800 kN and 1000kN each. The columns are 230 mm× 400mm and 230mm×500mm respectivey. The SBC of soil is 180 kN/m2 Use M30 grade of concrete and steel of grade Fe 500.
16 M
Solve any one question from Q.9& Q.10(a,b)
9
Design a rectangular water tank resting on ground. The tank dimemsions are 7m×3m×3m high. Use M30 and Fe 500 grade material. Sketch details of reinforcement.
18 M
10(a)
Design the circular water tank of 10m diameter ant 5m height with rigid base. Use M 30 and Fe 500 grade material. Sketch details of reinforcement.
10 M
10(b)
Explain step-by-step procedure of finding crack width for a wall of reactangualr water tank.
8 M
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