斜交框架桥受力特性有限元分析
首发时间:2012-11-22
摘要:通过大型通用有限元分析软件ANSYS对斜交框架桥进行分析,并将其与相应正桥对比,得到顶板各控制截面的内力分布特点及其与正桥内力分布的不同之处,结果表明斜交框架桥的内力并不像正桥一样沿跨中截面对称分布,而是有其独特的分布规律。可为该类桥的设计提供依据。另外,对板单元模型和实体单元模型分析结果进行分析对比,结果表明由于板单元建模时,在支点处赋予的有效厚度大于实际厚度,在该截面处弯矩大于实体单元弯矩,因此通过板单元简化分析进行设计是可行的,按照板单元设计的斜交框架桥偏安全。
关键词: 桥梁与隧道工程 斜交框架桥 板单元 实体单元 内力分布
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Finite Element Analysis of Static Behavior of Skew Frame Bridges
Abstract:The static behavior of the skew frame bridge is compared with the orthogonal one through finite element analysis; the result shows that the internal force of the two kinds of bridge is different. The internal force distribution of each control section is obtained with both of the solid element model and shell element model. The result shows that since the effective thickness of the supporting section is bigger than the actual thickness in the shell element model, the bending moment there is bigger than that of the solid element model. As a result, it is much safer to compute the internal forces of the skew frame bridge by shell element.
Keywords: Bridge and Tunnel Engineering skew frame bridge shell element solid element internal force distribution
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