Takashi KUSUNOKI
Modeling of Steel Bridge on Finite Element Analysis
Eiji IWASAKI
The numeric result with Finite Element Method is affected by mesh division and modeling. Moreover, there are many influential factors. However, influence of mesh division and modeling had not been almost evaluated yet. Therefore there is no general criterion for mesh division and modeling. The main objective of this paper is evaluate the influence of mesh division and modeling on numerical result with Finite Element Analysis.
Four I-girders steel bridge is employed as models. 1.Simple plate bending models as steel girder components. 2.I-girder and cross beam models. 3. Secondary members. Analysis with change mesh division and modeling method for these models, and consider precision.
Stress concentration: i.e., the stress that occurs at neighborhood of stiffener and fulcrum, is not target in this paper.
Results of this paper are as follows.
1) There are specialty and not-specialty problem as "Outplane bending or Inplane bending", "Shell element or Solid element" at each FEM softwares.
2) Precision of stress is decline if the size of element that adjacent to stress reference-point is change suddenly.
3) Stress and deflection are varied by the method of connect flange with web. In the model that I used in this study, an error is occurring at the same level as the required precision.
4) Stress is concentrated at a stiffener position and a fulcrum position. In addition, in a main girder neighborhood, stress in a cross beam is disturbed greatly. Because of such stress concentration is not target in total design, stress reference-point should be remote from stress concentration point.
5) The mesh division of a cross beam and cross frame does not affect load distribution.
6) A load distribution effect by intermediate sway bracing was confirmed.
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