核电厂最不利设计地震动研究

发布时间：2018-01-04 13:07

本文关键词：核电厂最不利设计地震动研究　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：动力时程分析法被认为是较精确的结构分析方法，各国抗震规范都做出规定，对重要的建筑结构应采用时程分析法作为补充计算。但是由于地震动的随机性和不确定性，使得结构在相同幅值的不同地震作用下具有不同的反应，那么在对结构进行时程分析时应选择哪些地震记录作为输入呢？各国规范中并没有给出详细的说明。对于一些特别重要的结构，应保证结构具有足够的抗震性能。本文以核电结构为研究对象，搜集大量地震记录，包括常规的板壳内地震动和板块间俯冲型地震动。通过统计分析找到可以表征核电厂潜在破坏势的地震动参数，并以此作为标准，找到核电厂结构的最不利设计地震动，从而提高核电结构的抗震性能。本文研究内容如下： (1)介绍并研究了国内外常用的地震动潜在破坏势参数和其优缺点，确定本文选用的32个地震动参数； (2)利用Opensees有限元软件对核电厂结构进行建模，通过对核电内部结构进行时程反应分析，得到内部重要设备的地震中值能力，并对安全壳进行Pushover分析，得到核安全壳的抗裂能力。 (3)针对板壳内和俯冲型两种不同类型的地震动，分别对32个地震动参数和4个结构地震需求参数进行线性相关性分析，得到核电厂内部结构和核安全壳的地震动潜在破坏势参数，结果显示两种不同类型的地震动对核电结构的潜在破坏势是相同的。内部设备潜在破坏势参数均为rmsa、Sa、Ia和Sv(T1)，安全壳为Sa(T1)。 (4)利用地震动潜在破坏势参数预测结构的局部破坏指标，通过对局部破坏指标求平均值得到反应核电厂潜在核泄漏程度的整体破坏指标OSDI，，并根据OSDI值的大小得到各场地的最不利设计地震动。并对本文所挑选的最不利设计地震动进行了验证。
[Abstract]:Dynamic time-history analysis is considered to be a more accurate structural analysis method, which is stipulated in the seismic codes of various countries. The time history analysis method should be used as a supplementary calculation for important building structures. However, due to the randomness and uncertainty of ground motion, the structure has different responses under different earthquakes with the same amplitude. Which seismic records should be selected as input in the time history analysis of the structure? No detailed explanation is given in the national norms. For some especially important structures, it is necessary to ensure that the structures have sufficient seismic performance. In this paper, a large number of seismic records are collected by taking the nuclear power structure as the research object. Through statistical analysis, the parameters of ground motion which can represent the potential damage potential of nuclear power plant are found and used as the standard. Find out the most unfavorable design ground motion of nuclear power plant structure, thus improve the seismic performance of nuclear power plant structure. The contents of this paper are as follows: 1) the potential damage potential parameters of ground motion and their advantages and disadvantages are introduced and studied at home and abroad, and 32 parameters of ground motion selected in this paper are determined. Opensees finite element software is used to model the structure of nuclear power plant. Through the time-history response analysis of the internal structure of nuclear power plant, the seismic median capacity of the important internal equipment is obtained. The Pushover analysis of containment is carried out, and the crack resistance of nuclear safety shell is obtained. The linear correlation analysis of 32 seismic parameters and 4 structural seismic requirements parameters is carried out for two different types of ground motion in plate and shell and subduction type. The potential damage potential parameters of nuclear power plant internal structure and nuclear safety shell are obtained. The results show that the potential damage potential of two different types of ground motion to nuclear power structure is the same, and the potential failure potential parameters of internal equipment are both Rmsaa Saani Ia and SvT1). The containment is sag T1. 4) using the parameters of the potential damage potential of ground motion to predict the local damage index of the structure, the global damage index OSDI, which reflects the potential nuclear leakage degree of the nuclear power plant, is obtained by calculating the average value of the local damage index. The most unfavorable design ground motion of each site is obtained according to the magnitude of OSDI value, and the most unfavorable design ground motion selected in this paper is verified.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU271.5;TU435

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