导　　师： 韩大建

学科专业： 081402

授予学位： 博士

作　　者： ;

机构地区： 华南理工大学

摘　　要： 基于对地震的高度不确定性以及结构安全性之间合理关系的认识,“小震不坏、中震可修、大震不倒”的多级抗震设防的思想在上世纪八十年代初期逐步被一些国家的抗震设计规范所采用。但在规范的具体实施中仍主要是以确保生命安全为目标的一级设计准则,抗震设计仍主要是采用基于强度/(或承载力/)的设计方法。大量的地震现象表明,许多结构在地震时都经历过相当大的非弹性变形,由于结构在地震中经历了较大的非线性变形,产生了严重的震害,造成巨大的经济损失。基于强度/(或承载力/)的抗震设计难以有效地控制结构在未来地震下的破坏程度。特别是随着现代工业化和城市化的发展,一些国家和地区城市的数量急剧增加,人口高度密集,社会财富也高度集中。破坏性地震的发生将会给社会造成严重的负担。 基于性能的结构抗震设计综合考虑生命安全和财产损失两方面的具体要求,将“小震不坏、中震可修、大震不倒”的多级设防理念进一步细化和具体化,是当前结构抗震设计理论的发展方向,并成为国内外结构抗震设计理论研究的热点。开展这方面的研究工作对更为科学地进行结构抗震设计与评估具有重要的理论意义和工程实用价值。 鉴于课题的研究背景和现阶段研究存在的问题,本文开展了以下的研究工作: 针对目前常用的变形性能指标不能考虑地震持时对结构抗震性能的影响,本文基于Lemaitre应变等价性理论和Rabotnov损伤变量定义,并根据已有的试验结果,提出了一种新的基于结构损伤的结构抗震性能指标。通过计算分析表明,新性能评价指标,概念明确,实用简洁,能较方便地求出结构在不同强度地震作用下的性能水准。 地震输入能量和滞回耗能是评价结构抗震性能的重要指标。对于未设耗能装置的结构,滞回耗能通过结构� With the recognition of the highly uncertainty of earthquakes and the reasonable relationship between economics and structural safety, the ideas of multilevel seismic design fortification of“No Damage with Frequently Occurred Earthquakes, Repairable with Fortification Intensity Earthquakes and No Collapse with Rare Occurred Earthquakes”has been adopted by national seismic codes in some countries since early 1980s. While putting the code into practice, engineers consider life safety as the first design criteria. And the force-based design method is mainly used in seismic design. Earthquake hazard shows that many structures underwent considerable non-elastic deformations. Such deformations cause serious damages and enormous economic loss. Force-based seismic design is difficult to control the extent of damage in prospective earthquakes. Especially, with the progress of modern industrialization and urbanization, the number of cities in some countries and regions increase drastically, population and public wealth are highly concentrated. The damage caused by earthquake will bring serious burdens to the society. Performance-based seismic design considers both life safety and economic loss, in which the idea of multilevel fortification is further detailed and concrete. It is regarded as the future direction of development for seismic design. Therefore, it is of great academic significance and practical value to carry out research about performance-based seismic design. Combining with background and current problems of the research topic, this paper has completed the following works. Considering the fact that deformation-based indices can not account for the influence of the duration of ground motion on structural damage, based on Lemaitre equivalent strain theory and Rabotnov damage variable definition, and in accordance with existing experimental results, a new performance index associate with stiffness degradation is proposed. The analysis has shown that the proposed performance index with clear conce

关 键 词： 钢筋混凝土 框架结构 基于性能的抗震评价 性能指标 地震输入能量 能量耗散 滞回耗能分布 能量指标 相关系数 抗震性能 静力弹塑性分析 非线性动力时程分析

领　　域： [建筑科学] [建筑科学]