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

Numerical analysis for effects of specimen fracture on facility of advanced structural testing( FAST)

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。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 facility of advanced structural testing（ FAST） is planned to be manufactured by China State Construction Engineering Corporation Ltd（ CSCEC）. The maximum allowable value of vertical force is 10800 t. It is necessary to consider the impact caused by the sudden fracture of specimen on the surrounding area. Here,the design of FAST and its isolation system were introduced briefly. The finite element simulation for the impact cause by the sudden fracture of specimen on FAST was conducted. Using the transient dynamic analysis method of Ansys,the loading steps were used to simulate sudden fracture of a specimen. Time-history curves of displace ments in X,Y and Z directions of the isolator and the isolator＇s force in Z direction were used as the evaluation indexes for the impact effects. Through changing the unloading time, the effects of unloading time on the vibration responses were analyzed and compared. The requirements for displacement and force of the isolator were checked. Finally,some suggestions about unloading time to simulate fracture of specimen and the number of isolators were proposed.