双向地震作用下高层建筑混合结构抗震性能及损伤模式研究

发布时间：2018-02-04 22:47

本文关键词： 型钢混凝土柱双向拟静力试验 SRC框架-RC核心筒抗震性能能量谱滞回耗能分布规律合理损伤模式　出处：《西安建筑科技大学》2015年博士论文　论文类型：学位论文

【摘要】：混合结构已成为我国高层建筑中一种主要的结构形式,该结构体系的优势在于:一方面其可有效地将钢材、混凝土以及钢-混凝土组合构件进行组合,既具有钢结构的技术优势又具有混凝土造价相对低廉的特点;另一方面,混合结构还具有刚度大、防火性好、耐久性好的优点。可见,混合结构是符合我国国情的高层建筑结构体系,预计未来必将有更大发展。本文采用试验研究及数值模拟的方法,进行了型钢混凝土(SRC)柱抗震性能的试验研究,并分析了SRC柱抗震性能的影响因素,在此基础上,建立SRC框架-钢筋混凝土(RC)核心筒结构模型,考察了结构的受力性能、滞回耗能分布规律及合理损伤模式。具体内容如下:本次试验共制作了2组8个型钢混凝土柱试件,包括4个方钢管混凝土柱和4个核心型钢混凝土柱,两组试件的尺寸、含钢率等均相同。主要探讨了加载路径、配钢形式对SRC柱的破坏形态、滞回性能、刚度退化、承载力退化、位移延性及耗能能力的影响,同时分析了不同加载路径下SRC柱中型钢、纵筋及箍筋的应力水平。以试验数据及数值模拟为基础,考察了轴压比、循环次数、位移幅值增量及变轴力等影响因素对SRC柱抗震性能的影响。首先建立弹塑性单自由度(SDOF)体系,分析了场地类别、滞回模型、强化段刚度、阻尼比及地震动强度等对地震输入能量谱的影响,并最终提出了SDOF弹塑性地震输入能量谱计算公式,在此基础上,建立满足二维屈服面函数的单质点双自由度(SPDDF)体系,并进行弹塑性地震输入能量谱计算与统计,分析了双自由度体系两主轴方向周期比对地震输入能量谱的影响,最终提出了SPDDF地震输入能量反应谱计算方法。采用弹性时程分析方法考察了单、双向地震作用下框架柱、剪力墙、框架梁及连梁等构件内力及结构层间剪力、倾覆弯矩的分布规律,同时采用弹塑性时程分析方法考察了单、双向地震作用下结构顶点位移、顶点速度、顶点加速度及层间位移角等结构响应规律,得出部分结论,可供高层建筑结构设计作参考。对SRC框架-RC核心筒结构进行罕遇地震作用下的弹塑性时程分析,研究了结构中各能量项的分布比例,考察了地震动特性及动力特性对结构滞回耗能的影响,并提出了各类构件滞回耗能比分配计算公式,同时考察了各类构件滞回耗能沿结构高度方向及水平方向的分布规律。选取影响SRC框架-RC核心筒结构抗震性能的主要设计参数:墙整体系数、轴向变形系数及刚度特征值,对不同结构算例进行双向罕遇地震作用下的弹塑性时程分析和非线性动力增量分析,研究了设计参数对框架-核心筒结构耗能分布模式及损伤模式的影响,提出了合理损伤模式并给出了设计建议。
[Abstract]:Hybrid structure has become one of the main structural forms in high-rise buildings in China. The advantage of this structure system is that on the one hand, it can effectively combine steel, concrete and steel-concrete composite members. It not only has the technical advantage of steel structure, but also has the characteristics of relatively low cost of concrete. On the other hand, the hybrid structure also has the advantages of high stiffness, good fire resistance and good durability. It is expected that there will be more development in the future. In this paper, experimental study on seismic behavior of SRC- shaped steel reinforced concrete columns is carried out by means of experimental research and numerical simulation. Based on the analysis of the influencing factors of the seismic behavior of SRC columns, the model of SRC frame-reinforced concrete (RC) core tube structure is established, and the mechanical behavior of the structure is investigated. The main contents are as follows: in this experiment, two groups of 8 steel reinforced concrete columns were made, including 4 square steel tube concrete columns and 4 core steel reinforced concrete columns. The size and steel content of the two groups of specimens are the same. The effects of loading path, steel distribution form on the failure form, hysteretic property, stiffness degradation, bearing capacity degradation, displacement ductility and energy dissipation capacity of SRC columns are mainly discussed. At the same time, the stress levels of steel, longitudinal bars and stirrups in SRC columns under different loading paths are analyzed. Based on the experimental data and numerical simulation, the axial compression ratio and cycle times are investigated. The effect of displacement amplitude increment and variable axial force on seismic performance of SRC columns is studied. Firstly, the elastoplastic single degree of freedom (SDOF) system is established, and the site category, hysteretic model and stiffening section stiffness are analyzed. The influence of damping ratio and ground motion intensity on the energy spectrum of earthquake input is discussed. Finally, the formula for calculating the input energy spectrum of SDOF elastoplastic earthquake is proposed. A two-degree-of-freedom SPDDF system satisfying the two-dimensional yield surface function is established, and the energy spectrum of elastic-plastic seismic input is calculated and counted. The influence of the ratio of direction and period of two spindle direction to period on the seismic input energy spectrum is analyzed. Finally, the SPDDF seismic input energy response spectrum calculation method is put forward and the single seismic input energy spectrum is investigated by using the elastic time history analysis method. The internal forces of frame column, shear wall, frame beam and connecting beam, and the distribution of shear force and overturning moment of the frame column, shear wall, frame beam and connecting beam are investigated under the action of bidirectional earthquake. At the same time, the elastic-plastic time-history analysis method is used to investigate the single structure. Under the action of bidirectional earthquake, the structural response law such as vertex displacement, vertex velocity, vertex acceleration and interstory displacement angle are obtained, and some conclusions are obtained. It can be used as a reference for the design of high-rise building structure. The elastic-plastic time-history analysis of SRC frame-RC core tube structure under rare earthquake is carried out, and the distribution ratio of each energy item in the structure is studied. The effects of ground motion characteristics and dynamic characteristics on hysteretic energy dissipation of structures are investigated, and the formulas for calculating the hysteretic energy dissipation ratio of various components are proposed. At the same time, the distribution law of hysteretic energy dissipation along the direction of height and horizontal direction of structure is investigated. The main design parameter of SRC frame-RC core tube structure is selected: the integral coefficient of wall. Axial deformation coefficient and stiffness eigenvalue are analyzed by elastic-plastic time-history analysis and nonlinear dynamic increment analysis for different structural examples under the action of bidirectional rare earthquake. The influence of design parameters on the energy dissipation distribution mode and damage mode of frame-core tube structure is studied. The reasonable damage mode is put forward and the design suggestions are given.
【学位授予单位】：西安建筑科技大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU973.31

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