Lecture+19 - 440:221 Intro to Engineering Mechanics:...

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440:221 Intro to Engineering Mechanics: Statics 1 Fall 2011 Based on Textbook Material: Engineering Mechanics Statics, 12 th Edition, R.C. Hibbeler, Pearson 2010. Alberto Cuitino, Po Ting Lin Instructors Arturo Villegas Assistants
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440:221 Lectures School of Engineering, Fall 2011 Method of the sections 2
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440:221 Lectures School of Engineering, Fall 2011 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 of the section? 3
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440:221 Lectures School of Engineering, Fall 2011 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 Reading Quiz B) B) D) D) C) C)
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440:221 Lectures School of Engineering, Fall 2011 Long trusses are often used to construct large cranes and large 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. Applications
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440:221 Lectures School of Engineering, Fall 2011 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. Since truss members are subjected to only tensile or compressive forces along
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This note was uploaded on 09/25/2011 for the course ENGINEERIN 221 taught by Professor Cuitino during the Spring '10 term at Rutgers.

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Lecture+19 - 440:221 Intro to Engineering Mechanics:...

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