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[M19 ST 1105]
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I M. Tech I Semester (R19) Regular Examinations
DESIGN OF REINFORCED CONCRETE FOUNDATIONS
STRUCTURAL ENGINEERING
MODEL QUESTION PAPER
TIME: 3 Hrs. Max. Marks: 75 Marks
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Answer ONE Question from EACH UNIT
All questions carry equal marks
UNIT -1
- a). Explain the design requirements of the foundation. CO1 | K4 | 5
b). Design a concrete pedestal for supporting a steel column carrying a total factored load of 1700kN. The size of the base plate is 300 mm square. Assume grade 25 CO2 | K6 | 10 concrete and Fe 415 steel.
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(OR)
- a). Explain the general procedure for design of square or rectangular footing. CO2 | K4 | 5
b). A solid footing has to transfer a dead load of 1000kN and an imposed load 400kN from a square footing 400 X 400 mm (with 16 mm bars). Assuming CO2 | K6 | 10 fy= 415 N/mm², fck = 20 N/mm²,and safe bearing capacity to be 200 KN/m² .Design the footing.
UNIT - II
- a). Explain the types of foundations of partitions walls'in ground floors CO1 | K4 | 5
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b). A brick wall of 250mm thick of a two-storeyed building is to rest directly on a R.C strip footing. Design the footing assuming the soil is sandy and its safe CO2 | K6 | 10 bearing capacity to be 100kN/mm².
(OR)
- a). Explain the different methods of analysis of continuous strip footing for un CO1 | K4 | 5 symmetric loading.
b). A series of five columns is'to be supported on a 20m x 2m strip foundation. Determine the Shear force and Bending moment for design. Assume safe bearing | CO2 | K5 | 10 capacity as 100kN/m². The loads are 300,350,400,450 and 500kN at 2,7.5,11.5,15,18 m from one end.
UNIT - III
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- a). Explain about the rigid and Flexible Foundations. CO1 | K4 | 7½
b). Explain about the deflection requirements of beams and slabs in rafts. CO3 | K4 | 7½
(OR)
- a). Explain the different types of raft foundation. CO3 | K4 | 5
b). Design a flat slab raft with edge beam for a layout of column loads by Direct Design Method. Assume the safe bearing capacity from settlement considerations | CO4 | K6 | 10 as 50kN/m² Assume columns are 300 x 300 mm enlarged to 600 x 600 mm as capital
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UNIT - IV
- a). Discuss about the estimation of settlement of piles in detail CO3 | K3 5
b). A bored pile of total length 13.2 m is with enlarged base has a shaft diameter of 600 mm and in the last 1.2m, it is enlarged to 1200 mm diameter. If the SPT (N) value of clay in which the shaft is installed is 13 and that of the enlarged portion is 15, estimate the settlement at the ultimate load of the pile. CO3 | K5 | 10
(OR)
- a). Explain about the conventional analysis of annular rafts. CO4 | K4 | 5
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b). The load from a circular water tank supported by six columns rests on a ring beam, which in turn, rests on an annular raft. Assuming the mean radius of the centres of column line is 8m and the total load from the tank is 30,000kN. Design the ring beam. CO2 | K6 | 10
UNIT -V
- a). Explain about the significance of under -reamed piles for expansive soils. CO3 | K4 | 5
b). The main brick wall of a room of a residential building is 225 mm thick and has a loading of 40kN/m at the foundation level. Another cross wall of the same thickness joins it and transmits a concentrated load of 35 kN. Design a layout of under reamed piles and grade beam for the foundation of the main wall CO3 | K6 | 10
(OR)
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- a). Discuss about the significance of Earth pressure on rigid walls CO1 | K3 5
b). Design a cantilever retaining wall with level backfill to retain 4 m of earth (f =30°) of unit weight of 19 kN/m³ CO2 | K6 | 10
CO: Crse Outcome
KL: Knowledge Level
M: Marks
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This download link is referred from the post: JNTUK M.Tech R19 2020 Model Question Papers || JNTU kakinada (All Branches)
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