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The Research of Stability and Utmost Load of Truss with Long Cantilever Based on Finite Element

Author: WangGuoQuan
Tutor: LiuJinMing
School: Tianjin University
Course: Structural Engineering
Keywords: Truss structure Finite Element Geometric nonlinearity Stability Ultimate bearing
CLC: TU323.4
Type: Master's thesis
Year: 2004
Downloads: 186
Quote: 5
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Abstract


Truss is at its ends by some elongated rod connection ( using methods such as welding or riveting ) formed by the geometry of the structure unchanged . Steel trusses in the ultimate limit state can occur following six conditions : 1 ) the entire structure or part thereof as a rigid body out of balance ; 2 ) the structural elements or link to material strength is exceeded and destruction ; 3) structural changes as the motor system ; 4) loss of structure or component stability ; 5 ) structure appear excessive plastic deformation , while not suitable to continue carrying ; 6 ) the fatigue fracture under repeated loads . Stability , resistance to brittle and fatigue ability to limit state of the structure have a great impact , this article only to do research on the stability and the ultimate load . But the stability problem of the structure is different from the stress problem solver : First , we need to consider the impact of the the deformed external force effect ; statically determinate and statically indeterminate structure distinction lost its meaning ; superposition principle is no longer applicable . In this article , the Tianjin strain test data in the construction of sports venues , processing , based on the following studies . Derived consider geometrically nonlinear ( physical linear ) finite element analysis of the general formulation of the Rayleigh - Ritz method is applied to get the space bar element nonlinear analysis of the stiffness matrix , and this approach applied to the examples obtained critical bearing capacity , and then compared with the geometric linear analysis results . Paper using classical linear buckling theory , linear buckling analysis of truss structure , and geometric nonlinear analysis using finite element analysis software ANSYS engineering examples and compared with the actual test results of the project , and then analyzes the giant stability limit of the carrying capacity of the truss . Can be integrated : based on the geometry of the finite element method for nonlinear structural stability analysis , the cantilever truss structure system , strengthen the junction stiffness Buckling can improve the structure , but is unfavorable for the displacement of the cantilever end node . Geometric nonlinear analysis , the strengthening of the stress stiffness matrix would have a negligible effect , so the priority during the selection should yield material to prevent the local members of the structural system instability has great role.

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CLC: > Industrial Technology > Building Science > Building structure > The system structure of the rod > Rod structure > Truss
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