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chapter 6-1 - CEE/ME 241_F'07 TRUSSES METHODS OF JOINTS...

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CEE/ME 241_F'07 Lecture Notes for Sections 6.1 and 6.3 1 TRUSSES – METHODS OF JOINTS Today’s Objectives : Students will be able to: a) Define a simple truss. b) Determine the forces in members of a simple truss. c) Identify zero-force members. In-Class Activities : Check homework, if any Reading quiz Applications Simple truss Methods of joints Zero-force members Concept quiz Group problem solving Attention quiz READING QUIZ 1. One of the assumptions used when analyzing a simple truss is that the members are joined together by __________. A) welding B) bolting C) riveting D) smooth pins E) super glue 2. In the method of joints, typically _________ equations of equilibrium are applied at every joint. APPLICATIONS Trusses are commonly used to support a roof. For a given truss geometry and load, how can we determine the forces in the truss members and select their sizes? A more challenging question is that for a given load, how can we design the trusses’ geometry to minimize cost? APPLICATIONS (continued) Trusses are also used in a variety of structures like cranes and the frames of aircraft or space stations. How can we design a light weight structure that will meet load, safety, and cost specifications?
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