预应力混凝土框架结构基于损伤的抗震性能概率评价研究

项目名称： 预应力混凝土框架结构基于损伤的抗震性能概率评价研究

项目编号： No.51278218

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 张耀庭

作者单位： 华中科技大学

项目金额： 80万元

中文摘要： 随着现浇预应力混凝土（PC）框架结构在我国地震设防区的不断推广与应用，对其开展基于损伤的抗震性能概率评价研究，具有重要的理论意义与工程应用价值。本项目以有粘结现浇PC框架结构为重点，通过非线性有限元精细化建模、构件拟静力试验及结构的振动台试验，进行该类结构的抗震分析。利用通用有限元软件建立基于纤维单元的结构弹塑性分析模型，由试验确定能体现预应力钢筋及普通钢筋刚度退化效应的滞回曲线，探究结构在弹塑性状态下预应力钢筋及预应力效应、粘结滑移的模拟方法；建立基于材料的损伤模型，确定损伤变量D与结构特定破坏参数值间的相关关系；确定合理的地震动强度指标，采用增量动力法（IDA）进行PC框架结构地震易损性分析，获取其在不同地震强度及性能水准下的地震易损性曲线；最后，针对我国规范有关PC框架结构在柱的轴压比限值、预应力度、屈服机制、延性框架设计调整系数等问题上存在的局限性与不足，提出建议及改进措施。

中文关键词： 预应力混凝土框架结构；纤维单元；基于IDA的易损性；抗震性能概率评价；优化设计

英文摘要： Cast-in-situ prestressed concrete frame structure is widely used in Chinese seismic zones, researches on damage-based probabilistic seismic performance evaluation of prestressed concrete frame structure have great theatrical value and practical sense . Cast-in-situ bonded prestressed concrete frame is presented as the key in this program, it is nonlinear finite element fining modeling, pseudo-static experiment for components and shaking table test for structures that are proposed to conduct the seismic analysis. Secondly, structural elastic-plastic analysis model based on fiber element will be built by universal finite element software and hysteresis loop which can embody the stiffness degradation effects of prestressed reinforcement and plain reinforcement will be ascertain through experiment, prestressed reinforcement, prestressed effects and the bond-slip simulation at the stage of elastic-plastic will be inquired. Thirdly, material-based damage model will be built so that the correlativity between damage variable D and other specific damage parameters in structure can be confirmed. Whereafter, reasonable intensity of a quake index will be confirmed, incremental dynamic analysis methodology (IDA) will be implemented to carry on seismic fragility analysis for PC framework structure to obtain seismic fragility

英文关键词： Prestressed Concrte Frame Structure；Fiber Unit；Seismic Fragility Analysis Based-on the IDA Method；Probabilistic Seismic Performance Evaluation；Optimization Analysis