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Truss Structures

1 Truss StructuresTruss Definitions and Details2 Truss : Mimic Beam Behavior3 Bridge Truss Details4 Framing of a Roof Supported Truss5 Common Roof Trusses67 Buckling Calculations2weakcr2 EIP( L)buckling force ==keffective length factor1 for an ideal Truss member==kk8 Types of TrussesBasic Truss Element three member triangular trussSimple Trusses composed of basic Truss elementsm = 3 + 2(j -3) = 2j -3for a simple trussm total number of membersj total number of joints9 Simple Truss10 Compound Trusses constructed by connecting two or more simple trusses to form a single rigid body11 Complex Trusses Truss that is neither simple nor compound12 Analysis of TrussesThe analysis of trusses is usually based on the following simplifying assumptions: The centroidal axis of each member coincides with the line connecting the centers of the adjacent members and the members only

Determinacy and Stability Internal Stability ≡ number and arrangement of members is such that the truss does not change its shape when detached from the supports. External Instability ≡ instability due to insufficient number or arrangement of external supports.

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