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类型 基础研究 预答辩日期 2017-09-17
开始(开题)日期 2015-04-24 论文结束日期 2017-05-30
地点 土木馆会议室 论文选题来源 省(自治区、直辖市)项目    论文字数 10 (万字)
题目 基于节点失效概率的钢框架地震易损性分析研究
主题词 钢框架,弹簧杆件模型,Pushover分析,IDA分析,地震易损性
摘要 在强烈地震作用下,钢框架梁柱焊接节点出现脆性断裂,以致引起结构严重的破坏,这超出了传统认识。传统的杆件模型、实体模型、精细模型、多尺度模型、弹簧杆件模型对钢构件、节点的承载力和刚度退化的模拟和预测无法同时达到准确性和高效性,往往会低估结构变形、高估结构抗倒塌能力,存在一定的安全隐患。本文对钢框架中常见的栓焊节点类型,提出了能够兼顾准确性和高效性的模拟钢框架结构损伤退化的理论模型,通过有限元程序的开发,实现了对钢框架结构考虑节点转动特性的弹塑性动力时程分析,发展了一种有效的地震易损性分析手段。论文的工作主要包含以下五个方面: (1)对比分析钢结构有限元常用模型(杆件模型、实体模型、精细模型、多尺度模型、弹簧杆件模型)的优缺点及适用范围。提出可以考虑栓焊节点转动性能的弹簧杆件模型,通过强轴和弱轴节点试验、钢框架拟静力试验、振动台试验验证模型在静力非线性和动力非线性模拟的准确性和高效性。通过对比ANSYS和SAP2000软件所建立模型的周期和振型等动力特性,验证建模方法的对实际结构的有效性和适用性。(第2章) (2)从设防水准、性能水准、性能目标三个方面对比分析中国和美国有关基于性能抗震设计规范的相同和区别。结合已有关于性能的文献和钢框架的性能分析,对钢框架的性能水平定义、破坏等级划分、性能指标选定。采用Pushover分析方法对单榀和整体钢框架模型进行静力弹塑性分析,确定性能指标的特征值。(第3章) (3)以地震峰值加速度(PGA)作为地震动强度参数,以结构层间最大位移角(ISDA)、顶点最大位移角(RDA)作为结构地震需求参数,建立钢框架结构地震需求模型。根据场地特征、地震分组等信息从太平洋地震数据库中选取22条地震波,将地震动强度划分为9级覆盖并包含抗震三水准。采用增量动力分析(IDA)方法对单榀和整体钢框架结构的单向和多向地震动时程分析,从地震响应分析、地震需求模型、三水准地震分析等三方面,研究节点转动能力、空间效应、楼板作用、多向地震波对钢框架地震响应的影响分析。(第4章) (4)考虑12个结构不确定性因素和1个地震动不确定性因素,采用拉丁超立方抽样方法对100个“结构-地震动”样本对进行钢框架地震需求分析。深入分析“结构-地震动”样本的地震需求模型函数规律,研究地震动不确定性和结构不确定性对地震响应参数离散性的影响。(第5章) (5)在地震需求分析和地震能力分析的基础上分别对钢框架单榀结构和整体结构的单向地震动和多向地震动的易损性分析。采用基于概率统计的理论分析方法研究在给定地震动强度的前提下,研究结构地震需求超越抗震能力的概率,分别以层间最大位移角(ISDA)、顶点最大位移角(RDA)作为性能指标绘制各种模型的地震易损性曲线,研究空间效应、楼板作用、节点转动以及地震动的多向对结构易损性的影响。在三级地震设防水准的基础上,增加考虑特大地震水准,分别提取结构的各个性能水平的超越概率,并与抗震规范对比,对钢框架地震易损性分析的给出一定的合理建议,为结构抗震安全评估提供参考依据。(第6章)
英文题目 Seismic Fragility Analysis of Moment-Resisting Steel Frames Based on Connection Failure ProbabilityFragility of Moment-Resisting Steel Frames Based on Connection Failure Probability
英文主题词 steel frame, spring bar model,Pushover analysis,IDA analysis, seismic fragility
英文摘要 During strong earthquakes, brittle fracture occurred to the welded joints of steel frame, which caused severely structural damage. The traditional models, such as bar model, solid model, fine model, multi-scale model, and spring-bar model, are unable to simulate and predict the bearing capacity degradation and stiffness degradation of steel components and joints accurately and efficiently at the same time. Traditional models may underestimate the structure deformation and overestimate the structural collapse capacity; it is a potential safety hazard. For the bolt welded joints, which are common of steel frames, one theoretical model was proposed to simulate damage degradation of welded steel frame with enough accuracy and efficiency. Dynamic elastic-plastic time history analysis was conducted, considering the joint rotation characteristic of steel frame through the finite element program, to develop an effective method of seismic vulnerability analysis. The dissertation mainly includes the following five parts. (1) The comparison and analysis is performed about the advantages, disadvantages, and the applicability among the common finite element models, such as bar model, solid model, fine model, multi-scale model and spring-bar model. A new type spring-bar model considering the rotation performance of bolt welded joint was proposed in this research; this model was validated by the strong axis and weak axis joints test, pseudo-static experiment, and shaking table test of steel frame. By comparing the dynamic characteristics (period and vibration mode) of finite element (FE) models from ANSYS and SAP2000 programs, the feasibility and practicability of simulation was verified. (Chapter 2) (2) The similarities and differences between performance-based seismic design specifications of China and the United States are studied in terms of seismic fortification levels, performance level, and performance goal. Based on the existing literatures about steel frame, a series of performance-based parameters about performance level, damage grade, and performance indicator are selected. The Pushover analysis method is used to perform static elastoplastic analysis and determine the eigenvalues of the performance indicators of the plane and space steel frame. (Chapter 3) (3) The seismic demand model of steel frame structure was established by taking earthquake peak ground acceleration (PGA) as the intensity parameters of earthquake ground motion, with the seismic demand parameters of the maximum inter-story displacement angle (ISDA) and the maximum roof displacement angle (RDA). According to the site characteristics and seismic intensity, 22 seismic ground motion records were selected from the Pacific seismic database. The ground motion intensity are divided into 9 groups including three seismic fortification levels. The incremental dynamic analysis (IDA) method is applied to study the unidirectional and multidirectional seismic time history analysis of the plane model and the space model of steel frame. The influence of joint rotation, space effect, floor-slab action, and the multidirectional seismic waves on the seismic response of the steel frame were discussed and analyzed. (Chapter 4) (4) Considering 12 structural uncertainties and 1 ground motion uncertainty, latin hypercube sampling was used to study the seismic demand analysis of 100 "Structure - ground motion" samples of steel frame. Therefore, the influence of the uncertainty about structure and ground motions on structural response were further studied. (Chapter 5) (5) The unidirectional and multidirectional seismic vulnerability analysis were conducted for plane model and space model of steel frame. Based on the method of probability, the structure failure probability were researched under a given ground motion intensity. The seismic vulnerability curves of the model were obtained in terms of the maximum ISDA and the maximum RDA to study the influence of joint rotation, space effect, floor-slab action, and the multidirectional seismic waves on the seismic fragility of the steel frame. The exceeding probability of the various performance levels were derived from the seismic vulnerability curves and compared to the seismic code. Finally, recommendations were made about the seismic analysis of steel frame and are beneficial for the structural seismic safety assessment. (Chapter 6)
学术讨论
主办单位时间地点报告人报告主题
江苏省电力设计院 2014.3.24 报告厅 马康 铁塔基础变形协调设计技术研究
南京航空航天大学 2014.12.9 报告厅 马康 Research on the Finite Element Modeling and Stability Analysis in Heterogeneous Reinforced Concrete Chimney
东南大学土木学院 2013.7.3 榴园宾馆报告厅 You-Lin Xu Rain-wind inducted vibration and control of stay cables in cable-stayed bridges
东南大学土木学院 2014.7.11 榴园宾馆报告厅 李霆 复杂超高层结构设计创新与实践
中国工程院 2015.5.8 钟山宾馆 欧进萍 结构振动控制研究与应用:进展与挑战
东南大学土木学院 2016.12.2 土木学院会议室 Tony T.Y. Yang Development of high-performance structural systems for seismic applications
东大土木工程施工研究所 2014.1.9 土木馆会议室 马康 再生混凝土的基本力学特性研究进展
东大预应力工程研究所 2013.11.13 土木馆会议室 马康 高空连廊提升施工关键技术研究
     
学术会议
会议名称时间地点本人报告本人报告题目
2013全国土木工程研究生学术会议 2013.10.25~2013.10.27 北京工业大学 异形钢筋混凝土烟囱有限元建模及基本性能分析
World Engineering Conference & Convention2015 2015.11.29~2015.12.2 日本京都 Study on Construction Technologies of Radiant Beam String Structure Supported by Special-shaped Steel Columns
     
代表作
论文名称
半刚性节点无支撑钢框架地震易损性分析研究
高空连廊支模钢平台整体提升施工全过程分析与控制
RESEARCH ON NATURAL VIBRATION CHARACTERISTICS AND SEISMIC RESPONSE OF LONG-SPAN PRESTRESSED TRUSS ST
 
答辩委员会组成信息
姓名职称导师类别工作单位是否主席备注
孟少平 正高 教授 博导 东南大学
董军 正高 教授 博导 南京工业大学
陆金方 正高 研究员级高工 其他 南京市城乡建设委员会
吴京 正高 教授 博导 东南大学
罗斌 正高 教授 博导 东南大学
      
答辩秘书信息
姓名职称工作单位备注
管东芝 其他 讲师 东南大学