防屈曲耗能支撑在三层斜放四角锥网架中的应用分析

Applied Analysis of Three Layer Flat Diagonal Square Pyramid Grid with Buckling-restrained Brace

采用空间结构设计软件MST2011建立周边中弦简支的正方形大跨度三层网架结构模型,并导入SAP2000中。利用大型有限元分析程序SAP2000V14.1,对防屈曲耗能支撑在大跨度三层网架结构中的减震效果进行探究。对网架结构中不同位置处的杆件用防屈曲支撑进行替换,在不同的替换方案下对结构进行动力时程分析。比较不同替换方案下关键杆件及关键节点的动力响应。得出较优的替换形式,为超大跨度三层网架结构的耗能减震设计提供参考。此外对结构不同部位的动力响应也作了分析。

The model of a three layer flat diagonal square pyramid grid was built in space structure designing software MST2011 and then imported into SAP2000. The antiseismic effect of three layer flat diagonal square pyra mid grid of long span with bucklingrestrained brace was explored with the largescale finite element analysing pro gram SAP2000V14. 1 . The bars in different parts of the grid structure were replaced with bucklingrestrained brace and dynamic time history analysis was carried out under different replacement schemes. The dynamic re sponse of key bars and key nodes of different replacement schemes is compared, and the better substitution scheme is then drawed, providing reference for the energy dissipation and antiseismic design of three layer diagonal square pyramid grid of long span. The analysis of dynamic response in different parts of the structure is also made.