杭州保税区拱形大门整体稳定性分析

Research on stability of arch-gate in Hangzhou free trade zone

杭州保税区大门跨度74m,结构形式为由3个在不同平面的拱组成的整体空间结构。利用有限元软件ABAQUS对工程进行了系统的整体稳定性分析。分析结果表明,结构平面外失稳为结构的第1阶失稳模态;完善结构的屈曲分析中可以引入扰动荷载以跟踪结构的二次分叉屈曲失稳路径;初始缺陷和活荷载的不利布置都对结构的极限承载力产生了较大影响。通过分析得到结构的整体稳定安全系数为3.5。

The arch-gate with 74m span in Hangzhou free trade zone is a spatial structure which is composed of three arches in different planes.The systematic stability analysis on this structure was performed by ABAQUS.The results show that the first-order instability mode of the structure is out-of-plane.The disturbance load should be introduced in perfect structural buckling analysis to track the structural instability path of the secondary bifurcation buckling.The initial imperfections and unfavorable arrangement of live loads have bigger effect on the ultimate bearing capacity.In final,the safety factor of the structure overall stability is 3.5 through analysis.