【作者】 王磊；

【导师】 郭彤； 卫海；

【作者基本信息】 东南大学 ， 建筑与土木工程（专业学位）， 2017， 硕士

【摘要】 摩擦耗能自定心混凝土墙(以下简称自定心混凝土墙)是一种新型结构体系,旨在控制结构在地震中的响应并实现震后自动复位。为研究自定心混凝土墙的力学性能,进行了低周反复加载试验以及数值模拟研究。结果表明,自定心混凝土墙结构具有预期的良好抗震性能。为推动自定心混凝土墙结构的应用,对自定心混凝土墙结构和传统现浇混凝土结构进行了地震易损性分析研究,并根据生命周期成本分析理论对其生命周期成本进行了计算分析,完成的主要工作如下:(1)开展了自定心混凝土墙结构的构造形式与主要力学性能试验研究。通过9组低周反复荷载加载试验,对自定心混凝土墙在循环荷载下的力学性能进行了研究,分析了钢绞线预应力、摩擦力等因素对自定心混凝土墙力学性能的影响。测量了墙脚钢套在试验中的应变,证明了其对于保护局部混凝土免于压溃的必要性。利用OpenSees有限元软件对自定心混凝土墙的数值模拟方法进行了研究,结果证明数值模拟与试验数据吻合较好,表明了数值模拟方法的有效性,为后续自定心混凝土墙的地震易损性分析提供了可靠的数值模型。(2)进行了自定心混凝土墙结构与传统现浇混凝土结构的地震易损性分析。介绍了地震易损性分析的基本原理和增量动力分析方法的基本步骤。确定了地震易损性分析中的地震动调幅方法、地震动强度指标、结构损伤指标和结构性能水准。从PEER的地震动数据库里选取四十条地震动记录对结构进行增量动力分析,并绘制分位曲线来评估数据的离散性。对增量动力分析数据进行回归分析,以此绘制两种结构的地震易损性曲线,以此对自定心结构和现浇结构进行地震易损性评估。(3)研究了自定心混凝土墙基于地震易损性的生命周期成本。介绍了生命周期成本的基本概念、阶段划分、生命周期成本分析的基本原理以及地震作用下基于概率的生命周期成本计算模型。对某一建设项目的两种结构设计方案进行生命周期成本计算,对比分析自定心结构和现浇混凝土结构的生命周期成本,表明了自定心结构作为一种新型结构体系在抗震性能以及生命周期成本上的优越性。上述工作为提高结构的抗震性能、减小结构损伤以及降低震后修复成本提供了参考。更多还原

【Abstract】 Self-centering concrete shear wall(SC Wall for short)with friction devices is a novel structure to control the seismic responses and to restore the original location after earthquakes.In order to study the mechanical behaviors of the SC Wall,nine low cyclic loading experimental tests and numerical study of the structure were conducted,which showed that the structure has expected excellent seismic performance.To promote engineering application of self-centering shear wall,seismic fragility analysis and life-cycle cost analysis for self-centering shear wall and conventional monolithic cast-in-situ reinforced concrete shear wall(short for RC Wall)were carried out.The main work are summarized as follow:(1)The configuration and main mechanical properties of SC Wall are introduced.Though nine low cyclic loading experimental tests,in which prestressing forces were applied to walls,the mechanical performance of the SC Wall was exmined.Influence of initial tendon forces of the walls,and friction forces on the mechanical behavior of the SC Wall was analyzed.The strain of embedded steel jackets at the toes of the wall were measured,the embedded steel jackets was proved to be necessary.The numerical simulation method is investigated by using the Open System for Earthquake Engineering Simulation(OpenSees),and good agreement is observed between the numerical simulation and the test results.A reliable numerical model is therefore obtained for the following seismic fragility analysis of the SC Wall.(2)Seismic fragility of SC Wall and RC Wall is analyzed.The principle of structural seismic fragility analysis and procedure of incremental dynamic analysis were presented.Amplitude modulation method of ground motion,intensity measure of ground motion and damage measure of structure,seismic performance level of structure are determined.Incremental dynamic analysis of the structure is completed based on forty selected earthquake records according to site classification.Discreteness of the data is evaluated by quantile curves.Seismic fragility curves are plotted in accordance with regression analysis of the data in order to evaluate seismic fragility of the two structures.(3)Life-cycle cost analysis of self-centering concrete shear wall is investigated,in conjunction with seismic fragility analysis results.The basic concept and stage division of life-cycle cost are introduced,and the principle and calculation model based on the failure probability are presented.Through comparative analysis of life-cycle costs between self-centering and cast-in-situ concrete structure,it is proved that the self-centering structure,as a novel structure,has more desirable seismic performance and life-cycle cost than the traditional structures.The above work provide references to promoting the increasing the seismic performance,reducing the structural damage and costs of post-earthquake rehabilitation.更多还原