Answered: Design a square footing for a column 20…

Design a square footing for a column 20 in. square, supports a dead load of 270 kips and a live load of 180 kips. The allowable soil pressure qo is 5 ksf at 6 ft

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter10: Mat Foundations

Section: Chapter Questions

Problem 10.1P: Refer to the rectangular combined footing in Figure 10.1, with Q1 = 100 kip and Q2 = 150 kip. The...

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Concept explainers

Load and resistance factor design

Load and resistance factors design (LRFD), also known as Limit state design (LSD), refers to the design method used in building engineering. A boundary condition is a condition of a structure where it can no longer meet the relevant design requirements. The condition may refer to the load level or other actions on the structure, while the terms refer to the integrity of the structure, suitability for use, durability, or other design requirements. A structure designed for LRFD is limited to keeping track of all possible actions during its design time and is always ready for use, with the appropriate level of reliability in each boundary condition. LRFD-based construction codes clearly define the appropriate levels of reliability in their instructions.

Question

Design a square footing by following the given data in the figure
Design a square footing for a column 20 in. square, supports a dead load of 270
kips and a live load of 180 kips. The allowable soil pressure ga is 5 ksf at 6 ft
below grade. Given, f= 4 ksi and fy = 60 ksi.

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Step 1: Data given:

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Step 2: Size of footing :

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Step 3: Load and load combination :

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Step 4: Design for shear ( Two way )

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Step 5: DEsign for shear :

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Step 6: Calculation for reinforcement :

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Step 7: Reinforcement bar development length :

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Step 8: Detailing :

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