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 minimum steel. 3.G. Check the ductility. 3.H. Check the spacing between rebars. 3.1. Check the development length. 3.J. Develop a sketch showing details of reinforcement in both directions.

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 minimum steel. 3.G. Check the ductility. 3.H. Check the spacing between rebars. 3.1. Check the development length. 3.J. Develop a sketch showing details of reinforcement in both directions.

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

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…
Repeat Problem 11.1 based on LRFD using the following factors: load factor for dead load = 1.25 load factor for live load = 1.75 strength reduction factor on the ultimate bearing capacity = 0.50 11.1 A continuous foundation is required in a soil where , , and . The depth of the footing will be 1.0 m. The dead load and the live load are 600 kN/m and 400 kN/m, respectively. Determine the required width for the foundation based on allowable stress design with FS = 3, using Eq. (6.10) and Table 6.1.
A continuous foundation is required in a soil where c=10kN/m2, =26, and =19.0kN/m3. The depth of the footing will be 1.0 m. The dead load and the live load are 600 kN/m and 400 kN/m, respectively. Determine the required width for the foundation based on allowable stress design with FS = 3, using Eq. (6.10) and Table 6.1.
Calculate the maximum factored load in kips that the square footing with B=6 ft can withstand under strength limit state and extreme event limit state?
Design a square pad footing with an overall depth of 600mm, cover to the reinforcements 50mm with 20mm diameter reinforcement bars in both directions. The footing carries a 400mm square column with a dead load of 1050KN and imposed load of 300KN. The safe bearing capacity of the soil is 170KN/m^2, fcu 30N/mm^2. Assume a unit weight of concrete to be 24KN/m^3 and footing weight 150KN
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.
A 500 mm square concrete column carries factored ultimate column loads of PU = 580 kN andMU = 30 kN@m. The vertical service load is 490 kN. It is to be supported on a square footingwith f′c = 20 MPa and fy = 420 MPa. The soil has an allowable bearing pressure for bearingcapacity of 650 kPa (based on LRFD methods) and an allowable bearing stress for settlementof 280 kPa. The groundwater table is at a great depth. Determine the required footing, width,thickness, size of the flexural reinforcement, and show your design in a sketch.
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 square footing is required to support a column of dimensions 450 X 450 mm. carrying 1000KN dead load and 750 KN live load. Given allowable bearing capacity of the soil is 210 KN/m^2, concrete compressive strength is 22.5 MPa .and steel yield is 400 MPa. Assume footing thickness is 600 mm Find footing side length
A3 mx 3 m square spread footing is to support a 350 mm x 350 mm column carrying a dead load of 750 kN and live load of 500 kN. For concrete f'c is 21 MPa and for steel, fy is 415 MPa. Use NSCP 2001 provisions. Determine the effective depth considering punching shear. A 300 mm 350 mm 400 mm 450 mm B.
5-A 10ft continuous flexible strip footing is subjected to a load of 500 psf. Find the change in stress A - Below a point 3ft deep and 6ft perpendicular to the center of footing. B - Below the edge of the foundation at a depth of 3ft. C - Below the center of the footing at a depth of 3ft.
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'