A 400 mm wall footing carries a PDL = 200 KN/m and PLL= 180 KN/m and a horizontal dead load of 30KN/mand horizontal live load of 30 KN/m cted to a distance 0.30 m from the center of the footing. The base ofthe footing is 1.20 m from the base on the footing. The allowable soil pressure is 200 kPa. The unit weight ofsoil is 16 KN/m and that of concrete is 24 KN/m. Use fc' = 28 MPa and fy = 280 MPa. Find the dimension ofthe footing and the reinforcements needed.

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I horizontal live load of 30 KN/m cted to a distance 0.30 m from the center of the footing. The base of e footing is 1.20 m from the base on the footing. The allowable soil pressure is 200 kPa. The unit weig

I horizontal live load of 30 KN/m cted to a distance 0.30 m from the center of the footing. The base of e footing is 1.20 m from the base on the footing. The allowable soil pressure is 200 kPa. The unit weig

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 10.2P

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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

A 400 mm wall footing carries a PDL = 200 KN/m and PLL= 180 KN/m and a horizontal dead load of 30KN/m
and horizontal live load of 30 KN/m cted to a distance 0.30 m from the center of the footing. The base of
the footing is 1.20 m from the base on the footing. The allowable soil pressure is 200 kPa. The unit weight of
soil is 16 KN/m and that of concrete is 24 KN/m. Use fc' = 28 MPa and fy = 280 MPa. Find the dimension of
the footing and the reinforcements needed.

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