模拟堆芯散体结构地震响应的简化新方法

Efficient Approach for Simulating Response of Multi-Body Structure in Reactor Core Subjected to Seismic Loading

针对核反应堆堆芯散体结构在地震载荷作用下的复杂响应,提出一种高效的三维模拟方法。该方案采用Abaqus软件中刚体及连接器功能,将堆芯散体结构简化为弹簧和阻尼器链接的质点系统,通过合理的简化获得相关力学参数。同时开发出一套脚本程序以实现堆芯结构三维简化模型的参数化建模。数值算例表明,在保证模拟工程精度的前提下,该方法的计算效率比常规方法提高百倍以上。

An efficient 3D approach is proposed for simulating the complicated responses of the multi-body structure in reactor core under seismic loading.By utilizing the rigid-body and connector functions of the software Abaqus,the multi-body structure of the reactor core is simplified as a mass-point system interlinked by spring-dashpot connectors.And reasonable schemes are used for determining various connector coefficients.Furthermore,a scripting program is also complied for the 3D parametric modeling.Numerical examples show that,the proposed method can not only produce the results which satisfy the engineering requirements,but also improve the computational efficiency more than 100 times.