强震下核电隔震结构的变频黏滞阻尼减震效应研究

Recent years, air pollution caused by coal-fired power generation is more and more severe. The construction of nuclear power plant which produce clean energy is exactly according with the strategic development requirements. While China and many nations all over the world have suffered repeatedly strong earthquake, so the seismic safety of nuclear power plant under rare earthquake and sudden-fault ground motions has become an urgent issue needed to be solved.This project aims at establishing a viscous damping vibration system with variable frequency and researches the material composition, energy dissipation, absorption mechanism and corresponding mechanical and mathematical model in damping analysis of the system.  Meanwhile, the overall isolation nonlinear calculating model of viscous damping vibration system with variable frequency is put forward. Besides, the correlation between high-performance isolation and excessively large displacement and influencing regularity caused by temperature, frequency and aging will be explored. This research also promotes frequency conversion rules of variable frequency viscous damping vibration system under SL2 earthquake or even more severe earthquake as well as the energy dissipation demands and application conditions of the system. Then, through the shaking table test method, this paper will analyze the seismic response and develop control strategy of the viscous damping vibration system with variable frequency. The objective of the project is to propose an applied fundamental theory of the viscous damping vibration system with variable frequency which is suitable for SL2 earthquake and with proprietary intellectual property rights.

近年来我国因燃煤发电等造成的空气污染极其严重，核电厂清洁能源的建设符合我国的战略发展需求，而我国及世界多地强地震屡次发生，因此在超强地震、突发断层地震作用下核电厂结构的抗震安全性已成为核电能源亟待解决的研究课题。本项研究旨在建立核岛结构的变频黏滞阻尼隔震体系，主要研究核岛结构的变频黏滞阻尼系统的耗能材料组成、能量耗散与吸收机制及对应的阻尼分析力学及数学分析模型；核岛结构的变频黏滞阻尼整体隔震非线性计算模型、高性能隔震和过大位移控制需求的相关性、系统受温度、频率、老化因素影响的规律；核岛结构的变频黏滞阻尼系统针对停堆安全SL2地震或更大地震作用下的变频准则、与变频相对应黏滞阻尼的耗能需求准则和适用条件；通过地震模拟振动台动力试验研究核岛结构的变频黏滞阻尼隔震体系的地震响应、响应控制策略等关键科学问题。项目目标是提出适应超SL2地震并拥有自主知识产权核电厂的变频黏滞阻尼隔震体系的应用基础理论。

本项目进行了变频黏滞阻尼减震结构体系的相关理论和试验研究，具体研究内容和工作成果包括：① 研究变频黏滞阻尼系统等效力学模型，包括各运动阶段的性能以及各阶段等效刚度和等效阻尼比。进行了不同面压、不同剪断直径的变频黏滞复合隔震系统研究，比较分析不同面压对支座力学性能的影响，重点对比了不同剪断直径的变频黏滞复合隔震系统力学性能的影响。② 设计变频黏滞复合阻尼隔震系统静力试验，进行了不同面压下竖向力学性能及水平剪切试验。设计变频黏滞复合阻尼隔震结构在两种不同摩擦系数的内摩擦板，重点研究了内摩擦摩擦系数不同对其力学性能的影响。③ 研究地震波频谱特性和场地特征周期等对变频黏滞阻尼隔震结构加速度响应的影响，推导了隔震结构加速度传递系数，研究了场地特征周期、结构高宽比和结构阻尼比等对结构加速度响应影响。研究地震波频谱特性和场地特征周期等对变频黏滞阻尼隔震结构位移响应的影响，推导了隔震结构位移传递系数；研究了场地特征周期、结构高宽比和结构阻尼比等对结构位移响应影响。④ 研究不同设防烈度下多遇、设防、罕遇地震作用下变频黏滞复合阻尼隔震结构动力响应，包括隔震层滞回性能、上部结构运动形式、位移响应和加速度响应。研究变频黏滞复合阻尼隔震对隔震结构在地震作用下结构动力响应的影响规律，并与传统隔震结构的振动控制效果进行对比。