【摘要】 屈曲约束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的装置从而应用于大跨度空间结构振动控制中。提出一种适用于网壳结构的屈曲约束支撑,通过对往复加载试验的模拟,得出屈曲约束支撑的滞回曲线,分析了此新型减震体系的工作原理并推导了地震激励下的运动方程,并以一跨度为120m的双层球面网壳为例,通过模态分析,研究了该网壳的自振特性;通过结构在三维ElCentro波作用下的动力响应分析,提出了屈曲约束支撑的布置方案,并进行了减震效果分析,得出峰值加速度、支撑的位置、数量是减震效果的影响因素。结果表明,安装屈曲约束支撑可以有效地减少大跨度网壳结构的振动反应。更多还原

【Abstract】 Buckling restrained brace is a remarkable kind of vibration control device,which can be expected to installed in controlling the vibration of large-span space structures as a novel device of high performance,because of its advantages of’economical under minor earthquakes,no failure under middle earthquakes,repairable under major earthquakes’.This paper presents a kind of BRB suitable for large-span reticulated shell structures and obtains the hysteretic curves through the simulation of the cyclic-loading tests.Working principle of this kind of vibration reduction system is introduced in this paper,and the equations of motion of the system under earthquake excitations are established.Further more,taking a 120m span double-layer reticulated spherical dome for example.Firstly,self vibration is studied through the analysis of the modes.Secondly,according to the dynamic response under the effects of 3D El Centro waves,the arrangement scheme of BRB are put forward,and the effectiveness of the seismic vibration reduction is analyzed.It shows that the peak acceleration and the numbers and the arrangement of BRB are key factors.The result shows that the BRB can reduce the vibration response of spatial reticulated structure effectively and the system has further potentials in the application of space structures.更多还原