A horizontal beam AD is supported by an inclined strut CB carries a load W = 2.4KN at the position shown. The strut which consists of one bar is connected to the beam by a bolt passing through the three bars meeting at joint C. BC is 75mm wide and 10mm thick strut while AD is 100mm wide by 10mm thick rigid bar. (a)What is the minimum required bolt diameter in at C if the allowable bolt shear is 68MPa? (b)Determine the stress in strut BC. (c)Determine the bolt stress at A if its diameter is 20mm.

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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.