核反应堆厂房的非线性抗震分析

在核工程抗震计算中 ,普遍还是采用线弹性模型进行动力计算 ,但一般结构物在强震中有可能进入弹塑性变形阶段。该文的主要目的是考察结构物在线弹性模型和弹塑性模型下地震响应的不同。以反应堆厂房为例 ,介绍了线性动力算法和非线性动力算法的不同特点 ,计算了厂房在线弹性模型和弹塑性模型下地震响应 ,并对结构响应进行了比较。与线性模型相比 ,弹塑性计算所得到的结构位移和加速度较大 ,但结构内力却相差不多。结果表明 ,采用非线性模型进行抗震计算可以得到更为真实的结构响应 ,可以更加合理地指导结构设计

Nonlinear seismic analysis of nuclear reactor buildings

Seismic analysis of nuclear reactors is normally based on linear elastic calculations. But general structures may reach the elastic plastic stage for strong earthquakes. This paper illustrates the different seismic responses of structures analyzed using linear elastic and elastic plastic models. Using a nuclear reactor building as an example, this paper introduces the different features of linear and nonlinear dynamic calculations and the different responses. Compared with linear elastic model, the elastic plastic calculation will give larger displacements and accelerations but comparable structure forces. The results show that more accurate structure movement is predicted by the nonlinear model for seismic events to provide more rational designs.