3. The beam BE is used for hoisting machinery. It is anchored by two bolts at B, and at C it rest on a parapet wall. The essential details are given in the figure. Note that the bolts are threaded as shown in Detail 1 with d=0.620 in. at root of the threads. If this arrangement is used to lift equipment of 10 kN, determine the stress in the bolts BD and the bearing stress at C. Assume that the weight of the beam in negligible in comparison with the loads handled. B Timber nominal Section 20cm x 30cm Bolts diam.%" 28 cm D 1m View A-A C₁ 18 cm 20cm 2.5 m Building 111 P=10 kN Detail 1 D d F E 111 Distributed Force equivalent to F Threaded bolt

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Loads and Reactive Forces

Loads are the external influences that a beam experiences under its working conditions. For instance, a beam may be subjected to shear loads, twisting loads, bending moment, and axial loads during its working conditions. Engineers primarily deal with beams and trusses in the civil engineering domain. Due to the influence of loads, it is very crucial to determine the induced stresses and deformation values. These values give an insight into the critical area of the beam that needs to be worked upon to make it fail-safe.