A 2.2 m wide x 0.47 m thick RC footing is to be provided for a250mm thick RC wall. The wall carries a dead load of 245 kN/mand a live load of 261 kN/m of the wall. The gross allowable soilpressure is 302 kPa. The bottom of the footing is 835 mmbelow the ground. Use f'. = 21 MPa and fy = 420 MPa. Unitweight is 23.6 kN/m3 for concrete and 18.4 kN/m3 for the soilbackfill.Calculate the ratio of the actual soil pressure to net effectivepressure. (q/qeff ).Answer in four decimal places. (i.e. 1.6125, 1.5140, 0.8461,etc.)You Answered1.2356Correct Answer0.8093 margin of error +/- 1%

Answer Let us first draw the diagram of RC wall footing based on the given data Calculation of…

A 2.2 m wide x 0.47 m thick RC footing is to be provided for a 250mm thick RC wall. The wall carries a dead load of 245 kN/m and a live load of 261 kN/m of the wall. The gross allowable soil pressure is 302 kPa. The bottom of the footing is 835 mm below the ground. Use f'c = 21 MPa and fy = 420 MPa. Unit weight is 23.6 kN/m³ for concrete and 18.4 kN/m³ for the soil backfill. Calculate the ratio of the actual soil pressure to net effective pressure. (q/qeff). Answer in four decimal places. (i.e. 1.6125, 1.5140, 0.8461, etc.)

A 2.2 m wide x 0.47 m thick RC footing is to be provided for a 250mm thick RC wall. The wall carries a dead load of 245 kN/m and a live load of 261 kN/m of the wall. The gross allowable soil pressure is 302 kPa. The bottom of the footing is 835 mm below the ground. Use f'c = 21 MPa and fy = 420 MPa. Unit weight is 23.6 kN/m³ for concrete and 18.4 kN/m³ for the soil backfill. Calculate the ratio of the actual soil pressure to net effective pressure. (q/qeff). Answer in four decimal places. (i.e. 1.6125, 1.5140, 0.8461, etc.)

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A 1.4 m wide x 0.33 m thick RC footing is to be provided for a 250mm thick RC wall. The wall carries a dead load of 170 kN/m and a live load of 338 kN/m of the wall. The gross allowable soil pressure is 330 kPa. The bottom of the footing is 625 mm below the ground. Use fe = 21 MPa and fy = 420 MPa. Unit weight is 23.6 kN/m3 for concrete and 18.4 kN/m3 for the soil backfill. The diameter of main bars is 16mm and that of the shrinkage and temperature bars 10mm Calculate the required spacing of the main bars in mm Answer in four decimal places. (i.e. 230.2112, 102.3292) DO NOT ROUND OFF FINAL ANSWER IN MULTIPLES OF 10mm You Answered 237.6619 Correct Answer 203.4027 margin of error +/-0.5
A 2.8 m wide x 0.42 m thick RC footing is to be provided for a 250mm thick RC wall. The wall carries a dead load of 161 kN/m and a live load of 224 kN/m of the wall. The gross allowable soil pressure is 260 kPa. The bottom of the footing is 1,031 mm below the ground. Use f'. = 21 MPa and fy = 420 MPa. Unit weight is 23.6 kN/m3 for concrete and 18.4 kN/m3 for the soil backfill. Calculate the ratio of the actual soil pressure to net effective pressure. (q/qeff ). Answer in four decimal places. (i.e. 1.6125, 1.5140, 0.8461, etc.)
A 300 mm concrete wall supports a dead load of 300 kN/m and a live load of 220 kN. The allowable bearing pressure is 240 kN/m². and the level of the bottom of the footing is 1.2 m. below the ground surface. Assume concrete weighs 24 kN/m³ and that of soil is 16 kN/m³. fc' = 28 MPa, fy = 248 MPa. Use 28 mm ø reinforcing bars. Thickness of footing = 600 mm, steel covering 100 mm. a. Compute the width of the wall footing b. Assuming the depth is safe in shearing, what is the moment at the critical section
A 1.6 m wide x 0.46 m thick RC footing is to be provided for a 250mm thick RC wall. The wall carries a dead load of 160 kN/m and a live load of 225 kN/m of the wall. The gross allowable soil pressure is 323 kPa. The bottom of the footing is 670 mm below the ground. Use f'= 21 MPa and f, = 420 MPa. Unit weight is 23.6 kN/m3 for concrete and 18.4 kN/m3 for the soil backfill. Diameter of main bars is 16mm and that of the shirnkage and temperature bars 10mm Calculate the ratio of the Demand Shear Force to Shear Capacity in one- way shear. Answer in four decimal places. (i.e. 1.6125, 1.5140, 0.8461, etc.)
3. A concrete wall footing is to supports a dead load including its own weight of 324 kN/m and a live load of 240 kN/m. The wall has thickness of 300 mm. The footing base is designed to be laid 1.8 m below ground surface. Assume allowable bearing capacity of soil to be 195 kPa, weighing 16.8 kN/m³ and concrete with weight of 23.5 kN/m3, Use factors 1.2 for dead load and 1.6 for live load. Fy = 415 MPa, f'e = 20.7 MPa 300 300 Ground Surface Ground Surface H= L00 m D-? qu =7 d=7 Figure 2b Figure 2a Which of the following is the width of the concrete footing? (Trial depth, D= 550 mm, concrete cover =75mm) 3.1 A. 161.92 kPa C. 159.82 kPa B. 162.76 kPa D. 161.10 kPa
A 1.9 m wide x 0.35 m thick RC footing is to be provided for a 250mm thick RC wall. The wall carries a dead load of 289 kN/m and a live load of 328 kN/m of the wall. The gross allowable soil pressure is 313 kPa. The bottom of the footing is 954 mm below the ground. Use f'c = 21 MPa and fy = 420 MPa. Unit weight is 23.6 kN/m3 for concrete and 18.4 kN/m3 for the soil backfill. Calculate the ratio of the actual soil pressure to net effective pressure. (q/qeff ).
A square footing 2.5m x 2.5 m supports a square column 300mm x 300mm at its center. Concrete cover to bar centroid = 100mm. Ultimate load combination is 1.2DL + 1.6L. Column loads aee service conditions:DL = 680 kN LL = 400kNf'c = 20.7 Mpa fy = 275 MPa Calculate the nominal punching-shear stress acting at the critical section of the footing slab if the thickness of the slab is 450 mm. (Correct Answer 1.99)
6.A 350mm concrete wall supports a DL = 220kN/m and LL = 145kN/m. The allowable bearing pressure is 215kPa and the bottom of the footing is 1m below the ground level. Weight of concrete is 24kN/m3 and that of soil is 16kN/m3. Thickness of the footing is 325mm with an effective depth of 250mm. a. Determine the effective soil pressure. b. Determine the required width of the wall footing. c. Determine the nominal shear stress of the wall footing.
A square footing 2.5m x 2.5 m supports a square column 300mm x 300mm at its center. Concrete cover to bar centroid = 100mm. Ultimate load combination is 1.2DL + 1.6L. Column loads aee service conditions: DL= 680 KN LL = 400KN f'c = 20.7 Mpa fy = 275 MPa Calculate the nominal punching-shear stress acting at the critical section of the footing slab if the thickness of the slab is 450 mm.
A 500 mm wall supports a dead load of 800 KN/m and live load of 780 KN/m and a horizontal dead load of 15 KN/m and horizontal live load of 20 KN/m subjected to a distance 0.50 m from the center of the footing. The allowable soil bearing pressure is 300 kPa. The base of the footing is 2 m below the grade. Assume concrete weighs 23.5 KN/m3 and that the soil has a specific gravity of 2.60, porosity of 0.60 and degree of saturation is 60%. Above the natural ground surface lies a tank half full of oil with specific gravity f 0.80 and the tank is 5 m high (oriented as vertical right cylinder). The total depth of footing is 600 mm with a steel covering of 100 mm. Use fc=21 MPa and fy = 275 MPa. Determine: a. dimension of wall footing rounded to the nearest 0.10 m. b. Adequacy in beam shear c. Steel reinforcement area required
A 300 mm concrete wall supports a dead load of 400 kN and a live load of 300 kN. The allowable bearing pressure is 250 kPa and the bottom of the footing is located 1.5 m below the ground surface. Assume concrete and soil weighs 24 kN/cu.m and 16 kN/cu.m, respectively. If f'c = 27.5 MPa, fy = 415 MPa, thickness of footing = 500 mm, steel covering = 75 mm using 25 mm diameter steel bars, a.) Compute the width of the wall footing. b.) Compute the spacing of bars at critical section.
Answer the following problem and show your solution 1. A 400 mm concrete wall supports a DL= 200 kN and LL =146 kN. The allowable bearing pressure is 216 kPa at the level bottom of the footing which is H=1.2m below the grade. Weight of concrete is 24 kN/m^3 and that of soil is 16kN/m^3. Thickness of footing is 300mm with an effective depth of 225mm. use load combination of U=1.4DL+1.7LL f'c-28 MPa, fy=248MPa. Use 28 mm diameter reinforcing bars. Normal weight concrete λ=1.0 a. Determine the effective soil pressure b. Find the width of the wall footing c. Compute the spacing of 28mm diameter steel reinforcement