基于DSEM的核电厂结构-土-结构相互作用模型

Parametric Studyon Structure-Soil-Structure Model of Nuclear Power Plant Based on Damping Solvent Extraction Method

核电厂结构的抗震能力是保障安全的重要内容,而考虑结构-土-结构相互作用(SSSI)的影响效应是必要的且意义重大。本文以阻尼溶剂抽取法(DSEM)为理论基础,考虑相邻工程结构与无限土体的动力特性,利用位移协调与力平衡机制,建立了相邻结构-土体相互作用计算模型,给出了具体数值实现公式,并通过UPFs二次开发功能在通用有限元程序ANSYS中实现该模型的嵌入。进而,以国内某核电工程为例,建立一系列SSSI系统的三维模型,并就不同的地基条件、埋置效应对核电厂反应堆SSSI规律的影响进行探讨,结果可为类似核电厂址地基的抗震适应性分析及优化设计提供借鉴与参考。

The seismic capacity of nuclear pow er plant is an important part of the guarantee of safety.It is necessary and significant to consider the effect of structure soil structure interaction（SSSI）.Based on Damping Solvent Extraction M ethod（DSEM）,considering the dynamic characteristics of adjacent structures and infinite soil and usingdisplacement coordination and force balance mechanism,in this paper,the calculation model of adjacent structure soil interaction is established.The concrete numerical realization formula is given,and the model is embedded in the general finite element program ANSYS based on User Programmable Features（UPFs）.Then,taking an example of thedomestic nuclear pow er project,a series of 3D model of SSSI system is established.The influence principle of the nuclear pow er plant reactor w ithSSSI is discussed under different conditions that includeground condition and embedmenteffect.The results can provide reference for similar nuclear pow er plant foundation in aseismic adaptability analysis and optimum design.