Question

3- (SKMMIH3/SME2113) from plastic having modulus of elasticity, E-4.0GPa a) Bar ABCD shown in Figure Q3a is made The bar consists of three segments, AB, BC, and CD. Segment AB is hollow and segments BC and CD are solids If the shortening (contraction) of bar ABCD is limited to 4.0 mm, determine the maximum allowable force P to be applied at C. (8 marks) 90 mm ΟΙ 00 mm 1080 min PL 500 mm 250 mm 250 mm Figure Q3a b) Rod CE and rod DF are attached to the rigid bar ABCD as shown in Figure Q3b. A 40 kN foroe is applied at A i. Sketch the free body diagram for the rigid bar ABCD. i. To determine the axial stresses in rod CE and rod DF, without any calculation, write the required static equilibrium and compatibility (deformation) equations for solving this problem. (2 marks) 0.2 m 0,6 m 0.75 m 40 kN Figure Q3b 4O (SKMM1113/SME2113) IO The construction crane consists of the column BE, the beam ABCD, and the counter weight which is attached at A as shown in Figure Q1. The counter weight is 80 KN in weight Determine:d a) the value of L so that only vertical reaction exists at B, b) the resultant internal loadings acting on the cross section at a-a cnil ni AİI:s -ai ) (10 marks) b) counter weight 40 kN 30 m section a-a Figure Q1 The jib crane is pinned at A and supports a chain hoist that can travel along the bottom flange of the beam. The hoist is rated to support a maximum of 7000 N, when r-3 m, determine: a) the force in rod BC b) the minimum diameter of rod BC (to the nearest 5 mm), c) the minimum diameter of pin B (to the nearest 5 mm). The material properties are listed in Table Q2 and use factor of safety of FS - 2. (10 marks beam

Answer 1

DATE ot. rn OR talasa 20