填充墙在RC框架结构倒塌中的作用及防倒塌措施研究.doc

填充墙框架结构论文：填充墙在RC框架结构倒塌中的作用及防倒塌措施研究【中文摘要】结构设计的一个基本任务是保证结构安全,防止结构在偶然荷载或地震作用下发生倒塌是结构设计的一个重要方面。填充墙框架结构是一种实际应用较广泛的结构形式,作为结构重要组成部分的填充墙,在以往的分析和设计中,只把其作为荷载或对其进行刚度折减。这种处理方法未能较好地反映填充墙与框架梁柱协同工作的机理及填充墙对框架结构的影响。基于对以上问题的考虑,本文按我国规范设计了4层、8层和12层钢筋混凝土框架结构,分别从填充墙对框架结构抗连续倒塌和抗地震倒塌的影响两方面进行了研究,并提出了相应的防倒塌措施。主要包括以下内容:1.本文利用ABAQUS软件分别针对连续倒塌试验、填充墙框架试验、多层多跨框架结构荷载试验、框-桁架结构试验和多层填充墙框架结构进行了模型验证。采用模型验证中的材料本构、单元类型、接触关系模型及参数的确定方法对设计的钢筋混凝土框架结构进行了建模。2.基于备用荷载路径法,采用非线性静力分析、非线性动力分析及竖向增量动力分析方法对设计的带填充墙和不带填充墙的RC框架进行连续倒塌分析。从柱失效点的竖向位移、结构构件的内力变化、结构能量变化和结构的抗倒塌能力等方面研究了填充墙对框架结构的影响。3.利用时程分析方法分别对带填充墙和不带填充墙的框架进行了多遇地震和罕遇地震作用下的动力分析。以结构各层的加速度峰值、层间位移角、楼层位移、结构能量等为指标研究了填充墙对框架结构抗震性能的影响。研究发现底层薄弱填充墙框架结构在罕遇地震作用下容易发生倒塌。4.基于普通钢支撑的防倒塌加固方法,利用不同支撑类型、不同支撑布置形式,分别针对纯框架结构防连续倒塌和填充墙框架结构防地震倒塌进行了研究。结果表明合理布置支撑能较好地提高结构的抗倒塌能力。【英文摘要】A basic task of structural design is to ensure the safety of buildings, and one of the significant aspects in structural design is to prevent the structure from col-lapse under the loads of accidenttal event or earthquake. Infilled frame structure is a widely used structure type in practical application. As an important part of the structure, the infilled wall is only taken as a load or reduced by its stiffness in the usual analysis and design. But these handling methods cannot well reflect the mechanism of cooperative work between the infilled wall and frame structures beams or columns and the effect of the inflled wall on the frame structure. Based on the above issues, a 4-story, a 8-story and a 12-story reinforced concrete frame structures are designed according to Chinese codes. The infilled wall effects on frame structure to resist progressive collapse and seismic collapse are studied, and the corresponding anti-collapse measures are proposed. The main contents are as follows.1. ABAQUS software is used to verify progressive collapse test, infilled wall frame test, multi-story and multi-span frame structure test, frame-truss test and multi-story infilled frame test. The reinforced concrete frame structures are modeled with constitutive relation of the materials, element type , contact relation model and determination methods of their parameters which adopted in model verification.2. Based on alternate load path method, with and without infilled wall RC frame are analyzed with nonlinear static analysis method, nonlinear dynamic analysis method and vertical incremental dynamic analysis method. The effect of infilled walls on infilled frame is studied from the following aspects: vertical displacement of collumn failure point, change of the internal forces of structural members, energy of the structure and structural anti-collapse capacity.3. Based on time history analysis method, with and without infilled wall frame are analyzed under frequently occurred earthquake and rare earthquake. The effect of infilled walls on frame is studied by the following indexes: story peak acceleration, story drift, floor displacement and energy of the structure. By the above study it can be found that RC frame structures with weakness story at bottom are liable to collapse under rare earthquake.4. Based on the anti-collapse method of common steel brace, anti-collapse of pure frame structure and seismic collapse of infilled frame structure are studied using different types and different layouts of brace respectively. The results show that rational layout of structural brace can better improve the structural anti-collapse capabilities.【关键词】填充墙框架结构 模型验证 连续倒塌 地震倒塌 防倒塌措施【英文关键词】infilled frame structure model vadidation progressive collapse seismic collapse anti-collapse measures【目录】填充墙在RC框架结构倒塌中的作用及防倒塌措施研究摘要4-5Abstract5-6第1章 绪论10-201.1 课课题背景及研究目的和意义101.2 连续倒塌研究现状10-151.2.1 连续倒塌的标志性事件11-121.2.2 国外研究现状12-141.2.3 国内研究现状14-151.3 填充墙框架抗震性能研究现状15-181.3.1 国外研究现状15-171.3.2 国内研究现状17-181.4 课题来源181.5 本文主要研究内容18-20第2章 基于ABAQUS 的建模及模型验证20-362.1 引言202.2 材料模型及取值20-232.2.1 钢筋模型202.2.2 混凝土模型20-222.2.3 填充墙材料模型22-232.3 有限元模型验证23-302.3.1 连续倒塌试验模型验证24-262.3.2 填充墙试验模型验证26-282.3.3 多层多跨框架结构模型验证28-292.3.4 框-桁架结构及多层填充墙框架结构模型验证29-302.4 结构模型及分析方法30-342.4.1 结构模型30-322.4.2 分析方法32-332.4.3 荷载取值33-342.4.4 阻尼342.5 本章小结34-36第3章 连续倒塌中填充墙的作用研究36-523.1 引言36-373.2 结构非线性动力响应37-463.2.1 柱失效时间对框架结构动力效应的影响37-383.2.2 柱失效点的竖向位移38-393.2.3 柱失效后内力分析39-423.2.4 能量变化42-463.3 结构非线性静力响应46-483.4 结构抗倒塌能力曲线分析48-513.4.1 填充墙对结构抗倒塌能力曲线的影响483.4.2 填充墙厚度对结构抗倒塌能力曲线的影响48-493.4.3 楼层数对结构抗倒塌能力曲线的影响49-513.4.4 柱失效位置对结构抗倒塌能力曲线的影响513.5 本章小结51-52第4章 地震倒塌中填充墙的作用研究52-714.1 引言524.2 地震动选取52-534.3 多遇地震下结构动力响应分析53-614.3.1 加速度时程对比53-554.3.2 位移时程对比55-564.3.3 层间位移及层间位移角对比56-574.3.4 楼层位移对比57-584.3.5 能量反应分析及对比58-614.4 罕遇地震下结构动力响应分析61-694.4.1 加速度时程对比61-634.4.2 位移时程对比63-654.4.3 层间位移及层间位移角对比65-664.4.4 楼层位移对比66-674.4.5 能量反应分析及对比67-694.5 本章小结69-71第5章 基于钢支撑的防倒塌措施初步研究71-925.1 引言71-72