A continuous concrete footing (yc = 24 kN/m³) of breadth 2.0 m and thickness 0.5 m is to be founded in a clay soil (cu = 22 kPa; y = 19 kN/m³) at a depth of 1.0 m. The footing will carry an applied vertical load of magnitude 85 kN/m run. The load will act on the centre line of the footing. Apply a factor of safety of 1.35 to the permanent action (dead load) and a factor of safety of 1 to the soil material properties and bearing resistance. Verify the bearing resistance limit state under undrained conditions. Is the width

A continuous concrete footing (yc = 24 kN/m³) of breadth 2.0 m and thickness 0.5 m is to be founded in a clay soil (cu = 22 kPa; y = 19 kN/m³) at a depth of 1.0 m. The footing will carry an applied vertical load of magnitude 85 kN/m run. The load will act on the centre line of the footing. Apply a factor of safety of 1.35 to the permanent action (dead load) and a factor of safety of 1 to the soil material properties and bearing resistance. Verify the bearing resistance limit state under undrained conditions. Is the width

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

Methods to Determine Vertical Stress

The load applied to the soil is transferred to the underground. The presence of water at soil pores and solid grains above the soil are the primary components that are responsible for the effective load transfer. Due to the load acting, the internal component of the soil or the underground formations undergoes deformations or a tectonic shift. The amount of deformation depends upon the amount of load acting on the soil surface, which indeed, depends on the weight of everything present above the soil. Due to this, the underground soil element develops internal stresses which try to resist the tectonic changes.

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A 6ft x 6ft foundation is subjected to an axial load Q = 225k and a moment M = 100k ft. The depth of footing is 5ft. The soil unit wt is 125pcf, phi = 32deg and c=1000psf Find: qmin qmax e B' L' qult using the general BC equation
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Foundation example
Design an isolated rectangular footing: P(dead load) = 225 kN P(live load) = 130 kN Qa = 180 kPa Df = 1.5 m Unit wt. of concrete = 23.5 kN/m^3 Unit wt. of soil =17.2 kN/m^3 Bar diameter = 20 mm f`c = 20.7 MPa fy = 248 MPa Width of footing, B is limited to 2m only Column = 40 cm x 40 cm Assume height of footing = 350 mm (check adequacy, if failed - increase the depth) Use min. cover = 75 mm Determine the following: (a) Effective Soil Bearing Pressure, Qe (b) Footing Dimension, L (c) Ultimate Soil Bearing Pressure, Qu (d) Check for Shear Criteria (Beam Shear) (e) Check for Shear Criteria (Punching Shear) (f) Required Steel Area (Long and Short Direction)
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