The four columns shown below have the following loads and dimensions (in the directions shown):Columns 1 and 2: DL=150 kN; LL=150 kN; 40 cm x 30 cmColumns 3 and 4: DL=300 kN; LL=250 kN; 50 cm x 40 cmEstimate the design safety factor for bearing capacity failure if the footing is placed at a depth of 2 m below the surface of a sandly-silty soil with c = 25 kPa, φ = 15° and γ = 17 kN/m3. Given the allowable bearing capacity of the soil qa = 125 kPa.Calculate the minimum concrete thickness, d', of the footing based on punching shear under column 4 (only). Use fc’ = 24 MPa, fy = 345 MP 3.0 m24.54 m3.2 m342.6 m0.89 m

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Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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The four columns shown below have the following loads and dimensions (in the directions shown):

Columns 1 and 2: DL=150 kN; LL=150 kN; 40 cm x 30 cm
Columns 3 and 4: DL=300 kN; LL=250 kN; 50 cm x 40 cm

Estimate the design safety factor for bearing capacity failure if the footing is placed at a depth of 2 m below the surface of a sandly-silty soil with c = 25 kPa, φ = 15° and γ = 17 kN/m³. Given the allowable bearing capacity of the soil q_a = 125 kPa.
Calculate the minimum concrete thickness, d', of the footing based on punching shear under column 4 (only). Use f_c’ = 24 MPa, f_y = 345 MP

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