A 40 kg block is attached to the wall with a wire and is resting on the 50 kg and 30 kg blocks on an inclined surface. The coefficients of friction for each contact between the blocks and the surface are shown in the figure. Determine the smallest force P which will cause sliding.

A 40 kg block is attached to the wall with a wire and is resting on the 50 kg and 30 kg blocks on an inclined surface. The coefficients of friction for each contact between the blocks and the surface are shown in the figure. Determine the smallest force P which will cause sliding.

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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Braced cuts

The braced cut is a method of providing lateral support to the soil in foundation trenches, to prevent the trenches from deformation by the caving in of soil and resisting it from moving laterally. During shallow excavation in firm soil, generally, slopes are provided to resist the caving in of soil. During shallow excavation in soft soil and deep excavation, the chances of caving in of soil increase. Hence, it becomes necessary to make a provision to resist the deformation of trenches due to caving in of soil. The braced cut is the method used for such conditions. The excavation using braced cuts is a bit uneconomical as compared to the traditional open-cut excavation method but provides better safety than the cut excavation method.

Question

40 kg
Hs3D0.4
50 kg
P.
30 kg
Ms = 0.3-
30°
shown in the figure. Determine the smallest force P which will cause
sliding.
ls = 0.45
A 40 kg block is attached to the wall with a wire and is resting on the
50 kg and 30 kg blocks on an inclined surface. The coefficients of
friction for each contact between the blocks and the surface are

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