防屈曲支撑在双层柱面网壳中的减震性能分析

Damping performance analysis of buckling restrained braces in double layer cylindrical reticulated shell

防屈曲支撑是一种效果良好的减震装置,由于其"小震经济、中震不坏、大震易修"的优点,有望成为新型的高性能装置从而应用于大跨度空间结构振动控制中.以一50m跨度的双层柱面网壳为实例,采用非线性时程分析的方法研究了柱面网壳结构在加入防屈曲支撑后的轴力及位移减震效果,通过不同的时程输入及不同支撑布置方式,得出了合理的支撑布置方式,在最优的布置方式下,位移减震效果可达27%,轴力减震效果可达47%,可见防屈曲支撑在双层柱面网壳中的减震效果较为理想,从而可以将其推广应用于其他形式的大跨度空间结构.

Buckling restrained brace is a remarkable kind of vibration control device with advantages of being economical under minor earthquakes, having no failure under middle earthquakes, being repairable under major earthquakes. It can be installed in long-span spatial structures to control the vibration structures as a novel device of high performance. Taking a double layer cylindrical reticulated shell with a span of 50m as an example, the damping effect of the cylindrical reticulated shell with buckling restrained brace was studied by nonlinear time-history analysis method. The different time-history input and different brace layout mode are considered and the reasonable bracing layout was obtained. With the optimal layout, displacement and axial force can be decreased by 27~ and 47~ respectisely. It shows the buckling restrained brace in double layer cylindrical reticulated shell has a good damping effect. It can be applied to other types of large span space structures.