斜交框架桥的有限元分析

Finite Element Analysis of Frame Bridge with Skew Angle

研究目的:探寻一种简便可行、能够用来指导框架桥设计的计算方法。研究方法:运用MIDAS有限元分析软件,分别建立厚板单元的三维空间模型和平面刚架的二维平面模型对某斜交框架桥进行分析,并采用对比法对2种模型结果进行对比。研究结果:给出了用MIDAS分析斜交框架桥的详细分析过程,得出斜交框架桥三维空间模型和二维平面模型分析的结果,并得出2种模型计算结果的差别。研究结论:斜交角度较小的框架桥,需采用三维空间模型计算分析来指导桥梁设计。运用MIDAS有限元分析软件建立三维空间模型计算斜交框架桥,方法简便,结果能反映斜交框架桥的空间受力特性,可用来指导桥梁设计。

Research purposes： To find out a simple and feasible computing method of skew frame to guide its design. Research methods：This paper analyzes the skew frame with 2D rigid frame and 3D space model of thick plate element with MIDAS Civil structure design system, and their results have been contrasted with comparison method. Research results ： The analysis process of frame bridge with skew angle has been given by use of MIDAS. We obtained the outcomes from two models and the difference between results with 2D rigid frame and 3D space model of thick plate element. Research conclusions：It is analyzed necessarily with 3D model for frame bridge of small skew angle to direct its design. MIDAS Civil structure design system is used easily and results from it reflect the 3D skew frame mechanical behavior to direct its design.