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Unformatted text preview: ENGI 1400 Engineering Mechanics I STATICS Winter 2009 L. Liu, Civil and Resource Engineering Chapter 7P1 Chapter 7 Internal Forces ; WHAT YOU SHOULD LEARN & UNDERSTAND FROM THIS CHAPTER? The method of sections for determining the internal loadings in a member Shear and moment equations and diagrams ; READING MATERIALS IN TEXTBOOK CHAPTER 7 (Sections 7.17.3) ; Fundamental RINCIPLES and APPLICATION EXAMPLES throughout the whole course APPLICATIONS These beams are used to support the roof of this gas station. Why are the beams tapered? Is it because of the internal forces? If so, what are these forces and how do we determine them? ENGI 1400 Engineering Mechanics I STATICS Winter 2009 L. Liu, Civil and Resource Engineering Chapter 7P2 7.1. Internal Forces Developed in Structural Members (Section 7.1) 1. Internal Forces The design of any structural member requires finding the forces acting within the member to make sure the material can resist those loads. For example, we want to determine the internal forces acting on the cross section at C. First , we first need to determine the support reactions. Then we need to cut the beam at C and draw a FBD of one of the halves of the beam. This FBD will include the internal forces acting at C. Finally , we need to solve for these unknowns using the E ofE. ENGI 1400 Engineering Mechanics I STATICS Winter 2009 L. Liu, Civil and Resource Engineering Chapter 7P3 In twodimensional cases, typical internal loads are normal...
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 L.Liu

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