Lecture 8 part I

# Lecture 8 part I - LECTURE 8 TRUSS, FRAMES, AND MECHINES...

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1 LECTURE 8 TRUSS, FRAMES, AND MECHINES PART I Contents INTRODUCTION PLANE TRUSSES

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2 I NTRODUCTION Previously, we used the equations of equilibrium to determine the external support reactions on a rigid body . As the second step, we would like to use the solved external forces to determine the joint forces in structures composed of pin-connected members . This is a necessary step to choose the fasteners to hold the structure together. In order to determine the joint forces , the structure must be divided into two or more parts . Then the joint forces at the separation points become external forces on each FBD and will enter into the equation of the equilibrium. The application of the equations of equilibrium to the various parts of a simple truss, frame, or machine allows the determination of all forces acting at the connections if the problem is statically determinate . In this lecture, we will be focusing on two of the more important and common types of structures in engineering structures: truss and frame . Truss is the structure composed of entirely of two-force members. Trusses generally are usually composed of straight members jointed together at their end points and loaded only at the joints ; consist of triangular subelements ; are constructed and supported so as to prevent any motion ; can carry a great load for a relatively smaller structural weight due to the airy structure.
3 Fig. 7-1 Typical examples of engineering structures known as trusses Frame is the structure that always contains at least one member acted on by forces at

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## This note was uploaded on 04/20/2009 for the course CVEN 221 taught by Professor - during the Summer '08 term at Texas A&M.

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Lecture 8 part I - LECTURE 8 TRUSS, FRAMES, AND MECHINES...

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