Factor of Safety =3 Material for Member AB is ASTM A36 Steel bb is cross-section of member AB. Distances AB-2m, BC-0.5m. .... 75.52° 30 (a) [30 marks] Calculate the maximum load, W, that can be safely hoisted before failure. (b) [5 marks] In (a) above. What shall be the mode of failure. Justify your answer. b=5cm W
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- A high-strength steel bar used in a large crane has a diameter d = 2.00 in. (sec figure). The steel has a modulus of elasticity E = 29 × 10 psi and Poisson’s ratio is v = 0.29. Because of clearance requirements, the diameter of the bar is limited to 2.001 in. when it is compressed by axial forces. What is the largest compressive load Pmaxthat is permitted?A steel pad supporting heavy machinery rests on Four short, hollow, cast iron piers (see figure). The ultimate strength of the cast iron in compression in 50 ksi. The outer diameter of the piers is d = 4.5 in, and the wall thickness is t = 0.40 in. Using a factor of safety of 3.5 with respect to the ultimate strength, determine the total load P that can be supported by the pad.A pinned-end strut of aluminum (E = 10,400 ksi) with a length L = 6 ft is constructed of circular tubing with an outside diameter d = 1 in. (sec figure). The strut must resist an axial load F = 4 kips with a factor of safety n = 2.0 with respect to the critical load. Determine the required thickness t of the tube.
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- The rails of a railroad track are welded together at their ends (to form continuous rails and thus eliminate the clacking sound of the wheels) when the temperature is 60°F. What compressive stress ?? =6.5×10-6 /? is produced in the rails when they are heated by the sun to 120"F if the coefficient of thermal expansion a = the modulus of elasticity E = 30 × 106 psi?The figure shows an idealized structure consisting of two rigid bars joined by an elastic connection with rotational stiffness ßR. Determine the critical load PCTfor the structure.Give the following problem a try. If you get stuck, here is one way to work it: Essential Solution Video. If load P = 17.5 kips, determine the normal force in bar (1). A 6 ft O 18.9 kips O 31.7 kips 33.7 kips 29.2 kips O 21.7 kips D B (1) 4 ft