PCE219 Exam 2Fall2006

PCE219 Exam 2Fall2006 - PCE219 NAME Exam 2 Fall2006 1(35...

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PCE219 Exam 2 Fall2006 NAME:____________________________ 1. (35 points) The following pinned-truss structure is suspended with two wires. The truss carries a load of 1,500 lbs split between three joints (G, H and I). The figure below shows the structure. The two wires are produced from steel with E=30x10 6 psi, and a yield stress of 30x10 3 psi. The truss is made from a new amazingly weightless material. a. Determine the minimum diameter needed for the wire so that the wires do not yield. b. Determine the forces in bars AB, BG, CG and GH. 500 lbs 500 lbs 500 lbs wire 100 in 100 in wire 100 in 100 in 100 in 50 in typical 75 in A B C D E F G H I 1
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2. (35 points). The beam given below is supported on the left with a pinned connection and a rounded surface in the middle that acts as a roller. It is subjected to the distributed load as shown. The beam has a cross-sectional area of A, an elastic modulus of E, and a coefficient of thermal expansion α . a.
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PCE219 Exam 2Fall2006 - PCE219 NAME Exam 2 Fall2006 1(35...

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