试件断裂对万吨级多功能结构试验系统隔振层影响的数值分析

万吨级多功能结构试验系统是中国建筑股份有限公司研制的重型结构试验设备，试验系统的综合功能和加载能力为世界同类设备之最。为减少试验系统对周边办公区域的影响，在设备的基座下面设置了隔振层。本文采用ANSYS瞬态动力学分析方法，针对试件断裂对万吨级多功能结构试验系统隔振层的冲击影响进行了分析，提取了试验系统基座底部边界角点的X、Y、Z方向位移和单个隔振器的Z方向受力时程曲线，对比分析了不同卸载时间对隔振响应的影响，并校核了隔振器的安全性，对模拟试件断裂的卸载时间提出了建议。针对不同隔振器数量布置的隔振层，计算了试件突然断裂时隔振效果的区别，提出了隔振器数量的建议。

The numerical analysis on impact caused by the fracture of specimen to Facility for Advanced Structural Testing(FAST)

The Facility for Advanced Structural Testing (FAST) is planned to be constructed by China State Construction Engineering Corporation Ltd (CSCEC). The maximum allowable value of vertical force is 10800t. It is necessary to consider the impact caused by the sudden fracture of the specimen. This paper simply introduces the design of FAST and isolation system. It focus on the finite element simulation of the impact cause by the sudden fracture of specimen. Using the transient dynamic analysis method by Ansys, the paper use the load step to simulate sudden fracture of the specimen. Time-history curve of X,Y,Z direction of the isolator and the isolator’s force in Z direction can be used as the evaluation index for the impact effect. Through changing the unloading time of load step, the paper compares the effects of unloading time on simulation of impact caused by sudden fracture, and check the requirement of displacement and force of the isolator. It finally give some suggestions about the unloading time of the load step to simulate fracture of the specimen.