Answered: A strip footing of width 3 m is founded…

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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Transcribed Image Text:0:YA O A comprehensive.. Example (1): A strip footing of width 3 m is founded at a depth of 2 m below the ground surface in a (c - 0) soil having a cohesion c = 30 kN/m? and angle of shearing resistance o = 35°. The water table is at a depth of 5 m below ground level. The moist weight of soil above the water table is 17.25 kN/m. Determine (a) the ultimate bearing capacity of the soil, (b) the net bearing capacity, and (c) the net allowable bearing pressure and the load/m for a factor of safety of 3. Use the general shear failure theory of Terzaghi. Example (2): If the soil in Ex. (1) fails by local shear failure, determine the net safe bearing pressure. All the other data given in Ex. (1) remain the same. Example (3): If the water table in Ex. (1) rises to the ground level, determine the net safe bearing pressure of the footing. All the other data given in Ex. (1) remain the same. Assume the saturated unit weight of the soil ya= 18.5 kN/m'. Example (4): If the water table in Ex.1 occupies any of the positions (a) 1.25 m below ground level or (b) 1.25 m below the base level of the foundation, what will be the net safe bearing pressure? Assume yat = 18.5kN/m, y (above WT) = 17.5 kN/m. All the other data remain the same as given in Ex. 1. Example (5): A square footing fails by general shear in a cohesionless soil under an ultimate load of Qut - 1687.5 kips. The footing is placed at a depth of 6.5 ft below ground level. Given o = 35°, and y = 110 lb/ft, determine the size of the footing if the water table is at a great depth (Fig). Example 7 A rectangular footing of size 10 x 20 ft is founded at a depth of 6 ft below the ground level in a cohesive soil ( = 0) which fails by general shear. Given: ysat =114 Ib/ft, c=945 lb/ft?. The water table is close to the ground surface. Determine qu, qu and qu by a) Terzaghi's method and Skempton's method. Use FS = 3. Example 9 Refer to Example 1. Compute using the Meyerhof equation (a) the ultimate bearing capacity of the soil, (b) the net bearing capacity, and (c) the net allowable bearing pressure. All the other data remain the same. Example 15 A water tank foundation has a footing of size 6 x 6 m founded at a depth of 3 m below ground level in a medium dense sand stratum of great depth. The corrected average SPT value obtained from the site investigation is 20. The foundation is subjected to a vertical load at an eccentricity 1 of B/10 along one of the axes. Figure Ex.15 gives the soil profile with the remaining data. Estimate the ultimate load, Qult, by Meyerhof's method. SPT 3, N-20 II

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