A 16 in square concrete column carries factored ultimate column loads of PU = 370 k andMU = 70 k@ft. The vertical service load is 310 k. The footing will be made of concrete withf′c = 3,000 lb/in2 and reinforcing steel with fy = 60 k/in2 . The soil has an allowable bear-ing pressure for bearing capacity of 8,200 lb/ft2 (based on LRFD methods) and an allowable bearing stress for settlement of 5,400 lb/ft2 . The groundwater table is at a great depth. Deter-mine the required footing, width, thickness, size of the flexural reinforcement, and show your design in a sketch.

A 16 in square concrete column carries factored ultimate column loads of PU = 370 k andMU = 70 k@ft. The vertical service load is 310 k. The footing will be made of concrete withf′c = 3,000 lb/in2 and reinforcing steel with fy = 60 k/in2 . The soil has an allowable bear-ing pressure for bearing capacity of 8,200 lb/ft2 (based on LRFD methods) and an allowable bearing stress for settlement of 5,400 lb/ft2 . The groundwater table is at a great depth. Deter-mine the required footing, width, thickness, size of the flexural reinforcement, and show your design in a sketch.

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter11: Load And Resistance Factor Design (lrfd)

Section: Chapter Questions

Problem 11.3P: Repeat Problem 11.1 based on LRFD using the following factors: load factor for dead load = 1.25 load...

See similar textbooks

Similar questions

Design round column footing for 18 in diameter that supports loads of PD = 240 k and PL = 140 k. The bottom of the footing is 6 foot below final grade, reinforced concrete weight is 150 lb/ft3 and the soil weighs 100 lb/ft3 the allowable soil pressure is 5 ksf. The concrete strength is 4,000 psi and the steel is Grade 60. 2
3. A W16×50 steel column with a 22-inch square base plate is to be supported on a square spread footing. This column has factored the ultimate vertical column load of 320 k. The vertical service load is 250 k. The footing will be made of concrete with f' = 2,500 lb/in² and reinforcing steel with fy = 60 k/in². The soil has an allowable bearing pressure for bearing capacity of 5,200 lb/ft² (based on LRFD methods) and allowable bearing stress for settlement of 3,400 lb/ft². The groundwater table is at a great depth. 3.A. Determine the required footing width after checking both the allowable bearing stress and serviceability (settlement) limit state. 3.B. Calculate the footing thickness after checking both the two-way and one-way shears. 3.C. Calculate the factored moment at the critical section. 3.D. Find the required steel area of the footing. 3.E. Compute the reinforcement ratio and check the minimum required steel. 3.F. Select the number and diameter of steel rebars and…
A proposed column has the following design loads:Axial load: PD = 200 k, PL = 170 k, PE = 50 k, PW = 60 k (all compression)Shear load: PD = 0, PL = 0, PE = 40 k, PW = 48 kCompute the design axial and shear loads for foundation design using ASD.
A footing of size 2.5 m x 2.5 m and 500 mm thick resists characteristic axial loads of 800kN dead and 300 kN imposed from a 400 mm square column. The safe bearing pressure on the soil is 230 kN/m2 and the characteristic material strengths are fcu = 35 N/mm2, fy=460N/mm2. Density of concrete is 24 k N/m3. Cover to all reinforcement is 50 mm. Determine the design load b) Check whether the base pressure is safe c) Design the bending reinforcement, assuming 16 mm diameter bars.
3. A W16×50 steel column with a 22-inch square base plate is to be supported on a square spread footing. This column has factored the ultimate vertical column load of 320 k. The vertical service load is 250 k. The footing will be made of concrete with f'c = 2,500 lb/in² and reinforcing steel with fy = 60 k/in². The soil has an allowable bearing pressure for bearing capacity of 5,200 lb/ft² (based on LRFD methods) and allowable bearing stress for settlement of 3,400 lb/ft². The groundwater table is at a great depth. 3.A. Determine the required footing width after checking both the allowable bearing stress and serviceability (settlement) limit state. 3.B. Calculate the footing thickness after checking both the two-way and one-way shears. 3.C. Calculate the factored moment at the critical section. 3.D. Find the required steel area of the footing. 3.E. Compute the reinforcement ratio and check the minimum required steel. 3.F. Select the number and diameter of steel rebars and check the…
20. Determine the nominal load when the concrete strain of 0.003 and tensile steel strain is 0.002075. A. 1090 kN B. 1554 kN C. 1168 kN D. 1401 kN
roportion a trapezoidal combined footing for uniform pressure under dead load plus reduced live load with the following data in table. Distance c/c of column is 6 m and projection beyond column not exceed 0.5 m DL+Reduce dLL=175Kn/m2 DL+LL=230KN/m2 columnA DL=620KN LL=390KN column B DL=670KN LL=815KN
A proposed column has the following design loads: Axial load: PD = 200 k, PL = 170 k, PE = 50 k, PW = 60 k (all compression)Shear load: PD = 0, PL= 0, PE = 38 k, PW = 48 k Compute the design axial and shear loads for the foundation design using ASD & LRFD load combinations.
1. Design a two-way slab having a dimension of 3m x 4m. The slab is to carry a uniform live load of 1900 Pa. Assume fc' fy = 27.6 MPa and 280 MPa for main bars. The slab is exposed to earth or weather. Use Unit weight of concrete yc = 23.5kN/m³ 3m 3m 3m 4m 4m 4m
2. Design a two-way slab having a dimension of 3m x 4m. The slab is to carry a uniform live load of 1900 Pa. Assume fc' = 27.6 MPa and fy = 280 MPa for main bars. The slab is exposed to earth or weather. Use Unit weight of concrete yc = 23.5kN/m³. Use NSCP 2015. 4m 4m 4m 3m 3m 3m
A simply supported 1 way slab having span of 3 meters is to carry the load for DL = 5kpa and LL = 4.8Kpa. If the concrete f'c = 28Mpa and rebar to be used is 10mm with fy = 276Mpa. a.) Determine the minimum thickness of the 1 way slab.(answer in millimeter in whole number) b.) Determine the Ultimate loading combination for the slab considering 1 meter strip?(answer in KN/m. in 3 decimal places ) c.) Determine the Ultimate moment for the slab considering 1 meter strip?(answer in KN-m. in 3 decimal places) d.) Determine the effective depth of the slab considering concrete cover = 20mmanswer in millimeter. in whole number e.) Determine the area of reinforcement for the slab based on the actual loadings.(answer in sq.mm. in 3 decimal places) f.) Determine the spacing of the rebar.(answer in millimeter(Don't round up, use actual value). in 3 decimal places)
Design a square reinforced concrete footing to support a 20-inch square tied concrete column at the edge of the building as shown below. Also check development length and force transfer in the column and at the footing. Draw the reinforcement pattern. Use a footing thickness of 24". Assume the following design conditions: -service dead load= 270 kips -service live load= 135 kips -allowable soil pressure (q)= 5000 psf -f. for the column= 5000 psi -f. for the footing= 3000 psi -fy= 60000 psi -longitudinal column steel consists of #8 bars reinf cement is uncoated -unit weight of the soil is 125 lb/ft3 -normal weight concrete Finished ground line 20" square column Y = 125 lb/ft³ 5'