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chapter 6-2 - CEE/ME 241_F'07 TRUSSESTHE METHOD OF...

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CEE/ME 241_F'07 Lecture Notes for Section 6.4 1 TRUSSES–THE METHOD OF SECTIONS (Section 6.4) Today’s Objectives : Students will be able to determine forces in truss members using the method of sections. In-Class Activities : Check homework, if any Reading quiz Applications Method of sections Concept quiz Group Problem solving Attention quiz READING QUIZ 1. In the method of sections, generally a “cut” passes through no more than _____ members in which the forces are unknown. A) 1 B) 2 C) 3 D) 4 2. If a simple truss member carries a tensile force of T along its length, then the internal force in the member is ______ . A) tensile with magnitude of T/2 B) compressive with magnitude of T/2 C) compressive with magnitude of T D) tensile with magnitude of T APPLICATIONS Long trusses are often used to construct bridges. The method of joints requires that many joints be analyzed before we can determine the forces in the middle part of the truss. Is there another method to determine these forces directly? THE METHOD OF SECTIONS In the method of sections, a truss is divided into two parts by taking an imaginary “cut” (shown here as a-a) through the truss.
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