某核电厂应急通道桥梁地震响应分析

Seismic Response Analysis of the Emergency Bridgeof a Nuclear Power Plant

摘要:

某核电厂为满足建设、运营及特殊情况下的应急需求，拟建应急通道桥，其抗震安全十分重要。本文介绍了考虑桥-桩-地基的三维整体精细化模型的有限元动力时程分析方法，计算桥梁在SL-1（运行安全地震动）和SL-2（极限安全地震动）地震作用下地基典型断面、T梁以及墩柱的动力响应。结果表明该方法能直接处理土的非线性问题以及方便的考虑地基辐射阻尼作用，同时可以精细模拟T梁和盖梁间的支座接触。三维计算采用自主开发的GEODYNA高性能软件平台，计算效率较高。该方法可为核电厂桥梁抗震设计提供参考。

Abstract:

In this paper, an emergency bridge was first built in a nuclear power plant to meet constructional, operational, and emergency needs, as seismic safety is very important. In this paper, the finite element dynamic time-history analysis method was introduced to construct a three-dimensional integral refined model considering bridge-pile-soil interaction. Maximum acceleration of typical subgrade section and T beam, and distribution of the maximum moment at the bottom of a bridge pier column were calculated under SL-1 and SL-2 earthquake actions. Calculated results showed that this method can directly address the nonlinear problem of soil and conveniently incorporate the radiation damping effect of the foundation. Contact between T beam and cover beam can be precisely simulated. Moreover, the independent development high-performance software platform GEODYNA, with its high efficiency, was used for 3D calculation. This method can provide some reference in the seismic design of bridges in nuclear power plants.