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Lecture+18 - 440:221 Intro to Engineering Mechanics Statics...

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440:221 Intro to Engineering Mechanics: Statics Instructor: Alberto Cuitino TA: Pam Carabetta and Jingru Zhang L t 18 Lecture 18 Fall 2009 1 Based on Textbook Material: Engineering Mechanics Statics, 12 th Edition, R.C. Hibbeler, Pearson 2010.
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440:221 Lectures Method of the sections School of Engineering, Fall 2009 2
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440:221 Lectures Topics to be covered What is the method of the sections? Why do we need another method if the method of the joints gives the solution for all members? How do we analyze simple truss structures using the method How do we analyze simple truss structures using the method of the section? School of Engineering, Fall 2009 3
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440:221 Lectures 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 B) C) 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 D) School of Engineering, Fall 2009
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440:221 Lectures Applications Long trusses are often used to construct large cranes and large electrical transmission towers electrical transmission towers. The method of joints requires that many joints be analyzed before we can determine the forces in the middle part of a large truss. So we need another method to determine such forces School of Engineering, Fall 2009 So we need another method to determine such forces.
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440:221 Lectures The method of the 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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