考虑SSI的层间隔震结构在三维长周期地震下的响应研究

Study on the response of mid-story isolation structure considering SSI subjected to three-dimensional long period earthquake

为进一步研究考虑SSI效应的层间隔震结构在三维长周期地震下的响应规律以及与普通地震动作用下的区别,分别输入一维、二维、三维的普通地震动与长周期地震动。针对在长周期地震动三维输入工况下支座应力远超规范值的问题,在原支座的基础上,增加竖向隔震装置,不仅减小了支座应力,同时进一步验证了三维隔震结构在长周期地震作用下的可靠性。研究发现,长周期地震动作用下,考虑SSI效应的层间隔震结构地震响应大于普通地震动输入下的响应;三维长周期地震下结构地震响应大于一维和二维输入下的响应;三维隔震结构在长周期地震作用下仍然可以有效隔离竖向地震,支座应力有效减小,地基土体应力得到优化,具有良好的隔震效果。

In order to further study the response law of mid-story isolation structure considering SSI effect subjected to three-dimensional long-period earthquake and the difference with ordinary ground motion,one-dimensional,two-dimensional and three-dimensional ordinary ground motions and long-period ground motion are input respectively.Aiming at the more serious stress overrun problem of bearing subjected to three-dimensional long-period earthquake,the reliability of three-dimensional isolation structure subjected to long-period earthquake is further verified by adding three-dimensional isolation bearing.It is found that the seismic response of inter-story isolation structure considering SSI effect is greater than that subjected to ordinary ground motion input under long-period ground motion.The structural seismic response subjected to three-dimensional long-period earthquake is greater than that subjected to one-dimensional and two-dimensional inputs.The three-dimensional isolation structure can still effectively isolate the vertical earthquake under the action of long-period earthquake,the bearing stress is effectively reduced,the foundation soil stress is optimized,and the isolation effect is obvious.