大跨维修机库地震响应被动控制研究

Study on seismic response passive control of long-span maintenance hangar

大跨维修机库动力特性复杂,针对该类结构的减震研究则刚刚起步。结合大跨机库的地震响应特点,分别布置柱间消能支撑、柱顶隔震支座以及屋盖下弦布置TMD,研究这三种减震方法对机库结构在水平、竖向地震作用下相应方向上地震响应减震的可行性。通过对比各减震方法下机库结构基底剪力、柱顶位移以及屋盖杆件内力、节点响应的减震效果,分析了各减震方案的优缺点。研究结果表明,通过合理地布置减震装置和设置参数,采用本文被动控制技术可以很好地降低机库结构不同方向的地震响应。

The dynamic characteristic of long-span hangar is very complex, while shock absorption study on this type of structure is just started. Combining with seismic response characteristic, three shock absorption methods were proposed including setting fluid viscous dampers between columns and joints of the roof, column cap seismic isolation and tuned mass damper. Feasibility study of the three damping methods for the seismic response of the hangar under earthquake input from different directions was carried out. The reduction effects of base shear, lateral displacement of column cap, inner force of space-frame poles and displacements of joints in the roof were compared and the advantages and disadvantages of every method were analyzed. The results show that passive control methods can effectively decrease the seismic response by setting shock absorbing device and parameters reasonably.