深埋反应堆厂房土结相互作用下的楼层反应谱分析

Floor response spectrum of deep buried reactor building under soil-structure interaction

埋深对核安全级厂房楼层反应谱的计算具有较大影响,尤其当埋深较大且周围的地基岩性较好时,其对厂房的约束作用不可忽略,土—结相互作用明显,国内鲜有对深埋结构采用三维整体分析法进行土—结相互作用分析的研究。利用ANSYS分别建立某反应堆厂房上部结构和其周围岩土体的三维有限元模型,两者之间采用接触单元进行真实模拟,采用无质量的三维地基模型进行楼层反应谱的计算,并同采用地基阻抗函数简化模型来考虑地基影响的ANSYS三维结构有限元模型所计算的楼层反应谱进行对比分析,以期为类似工程的楼层反应谱计算提供一些有用的参考和建议。

The depth of burial has a great influence on the calculation of floor response spectrum of nuclear safety grade plant,especially when the depth is larger and the surrounding rock is better,its restraint on the plant can not be ignored,soil-structure interaction is obvious,There are few studies on soil-structure interaction analysis of deep buried structure using three-dimensional global analysis method.A three-dimensional finite element model of the upper structure of a reactor plant and its surrounding rock and soil is established by ANSYS,between the two contact element is used to simulate,the massless foundation model is used to calculate the floor response spectrum calculation.and compared with the simplified model of the impedance model considering the influence of rock and soil by ANSYS three-dimensional finite element model on the floor response spectrum,so as to provide some useful references and suggestions for the calculation of floor response spectrum of similar engineering.