变高度楼面桁架梁的计算分析与应用

The computational analysis and application of variable height truss girder

中南科研设计中心项目主楼的楼层梁采用了一种变高度桁架梁,但桁架梁杆件众多,在结构整体模型中需要采用等效实腹梁来替代变高度桁架梁进行建模和整体分析。采用通用有限元ANSYS软件,对变高度桁架梁及其等效变高度实腹梁进行仿真对比分析,得到两者在上下翼缘、两端实腹段的应力分布状态以及应力值基本一致,表明等效变高度实腹梁可以替代变高度桁架梁,但应对等效变高度实腹梁的竖向变形刚度进行折减。

The variable height truss girder is applied in the Central-South scientific research design center project.In the process of modeling and analysis,equivalent solid-web girder was used instead of the variable height truss girder for convenience.Using ANSYS to analyze and contrast the performance of two different kinds of beams,the stress distribution and stress value of both flange and solid-web part are almost the same.The conclusion shows that equivalent solid-web girder can substitute variable height truss girder,considering the reduction of former deformation capacity.