地基土对设备-结构体系能量反应影响分析

Effect analysis of soil on the energy response of equipment-structure system

为了分析地基土对设备-结构体系能量反应的影响规律,开展了设备-结构体系振动台试验与设备-结构-地基土相互作用体系实时子结构振动台试验,对比以刚性地基为假设的设备-结构体系与考虑地基土影响后的设备-结构体系能量反应发现:考虑地基土影响后设备与结构的累积总输入能大幅度减小,且地基土可改变设备与结构总输入能在时间上的分布特性。由试验结果根据相似关系反推原型设备-结构体系的能量反应表明,基于刚性地基假设的设备-结构体系能量反应可能存在较大误差,因此在设备-结构体系分析中应当考虑地基土的影响。

To investigate the effects of soil on the seismic energy response of the equipment-structure system,the shaking table test and the real-time substructure shaking table test of an equipment-structure-soil system were carried out in this study.The energy response of the equipment-structure system in the case of rigid ground was compared with those of considering the effects of soil.The input energy of the equipment-structure system was found to decrease significantly due to the effects of soil.Furthermore,the effect of soil led to a change in the time distribution characteristics of total energy input.Additionally,the energy response of the original equipment-structure system was also deduced based on the similitude scale factors,which resulted in significant errors compared with those of considering the effects of soil.Therefore,it is imperative to pay an attention to the effects of soil in the design of equipment-structure systems.