Q1: A column foundation (Fig. 1) is 3 mx 2 m in plan. Given:25%, C-50 kN/m². Using modified Meyerhof'sequation and FS-4, determine the net allowable load theDr-2m.foundation could carry.H3mx2m7-168 ANleval

Reference : Foundation Engineering, Net allowable load. To determine : Net allowable load Q in KN.…

Answered: Q1: A column foundation (Fig. 1) is 3…

Q1: A column foundation (Fig. 1) is 3 mx 2 m in plan. Given: Dr-2m. 6-25, C-50 kN/m². Using modified Meyerhof's equation and 15-4, determine the net allowable load the foundation could carry. 168 Ne

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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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

Q1: A column foundation (Fig. 1) is 3 mx 2 m in plan. Given:
25%, C-50 kN/m². Using modified Meyerhof's
equation and FS-4, determine the net allowable load the
Dr-2m.
foundation could carry.
H
3mx2m
7-168 AN
leval

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Step 1 Meyerhof's equation

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Step 2 Determine the bearing capacity

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Step 3 Determine the Shape factor

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Step 4 Determine the Depth factor and load inclination factor

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Step 5 Determine the overburden Pressure and bearing capacity

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Step 6 Determine the Net Allowable load

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A 600 mm square interior column, reinforced with eight No.25 bars of Grade 420, supports a dead load of 866 KN and a live load of 577.33 KN. Assume that a live load reduction of 30% may be allowed at foundation level. The foundation is to be placed at a depth of 1m where the allowable bearing capacity is 110 KPa. The average density of the backfill material and the footing concrete together may be taken as 2100 Kg/Cu.m, while the filling from ground to plinth level is to be 0.5m of material with average density of 1900 Kg/Cu.m. Design a square footing using fc’=20 MPa, fy for foundation steel=300 MPa and fy for dowel steel=420 MPa.