Lecture 33 sect 6.9

# Lecture 33 sect 6.9 - y T A x A y F BE C y C x W C y C x F...

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ME221 Lecture 33 1 ME 221 Statics Lecture #33 Section 6.9

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ME221 Lecture 33 2 Homework #11 Chapter 6 problems: 68 & 75 Due Friday, November 21
ME221 Lecture 33 3 Homework #12 Chapter 8 problems: Due Monday, December 1

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ME221 Lecture 33 4 Quiz #7 Friday, November 21 Analysis of Structures Method of Joints or Method of Sections
ME221 Lecture 33 5 Frames and Machines Frames and machines have at least one multi-force member Frames are designed to support loads Machines are designed to transmit and modify loads Just like trusses, frames and machines need to be disassembled to determine member forces Need to draw a FBD for each member

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ME221 Lecture 33 6 Disassembly Exposes Internal Forces First, reactions of entire structure W A B C D E W A B C D E T A x A

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Unformatted text preview: y T A x A y F BE C y C x W C y C x F BE F BE F BE • Second, disassemble and solve for internal forces F BE is a two force member ME221 Lecture 33 7 Notes on Previous Problem • Without recognizing BE is a two force member the problem, is not tractable. • MUST draw a FBD for entire structure and each disassembled part • Each FBD may have three unknown forces which are found from Σ F x = 0; Σ F y = 0; Σ M z = 0 ME221 Lecture 33 8 General Procedure • Draw FBD for entire structure and solve for reaction forces: Σ F x = 0; Σ F y = 0; Σ M z = 0 • Disassemble into component parts – Recognize two force members – Draw FBD and solve for reaction forces - using Σ F x = 0; Σ F y = 0; Σ M z = 0 ME221 Lecture 33 9 Example Problem...
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## This note was uploaded on 07/25/2008 for the course ME 221 taught by Professor Buch during the Summer '08 term at Michigan State University.

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Lecture 33 sect 6.9 - y T A x A y F BE C y C x W C y C x F...

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