高层建筑混凝土框架—核心筒结构抗震性能和地震损伤研究
发布时间：2018-11-21 13:59
【摘要】：近年来，混凝土框架-核心筒结构广泛应用于高层建筑中，但国内外对其在地震作用下的非线性性能和损伤研究较少，不能满足发展的需求，因此，研究钢筋混凝土框架-核心筒结构地震破坏机理、抗震性能、地震损伤等具有重要意义。本文采用理论分析及数值模拟相结合的方法，以结构非线性地震反应分析为手段，从钢筋混凝土框架-核心筒结构变形和能量反应研究入手，开展了以下几个方面的研究工作： 针对目前规范中对于弯曲型结构变形控制存在的问题，结合国内外钢筋混凝土结构性能水平的划分标准，将钢筋混凝土框架-核心筒结构的性能水平划分为良好使用、继续使用、暂时使用、中止使用和接近倒塌五个等级。针对4个地震作用水平，建立了钢筋混凝土框架-核心筒结构的抗震设防目标，推导了针对剪力墙构件不同性能水平下受力位移角计算公式。在统计分析国内试验数据的基础上，得出结构及构件受力位移角的性能指标。分析了钢筋混凝土框架-核心筒结构侧移模式及变形组成，将楼层位移分为受力层间位移及非受力层间位移，给出了结构受力层间位移弹性阶段解析计算方法和弹塑性阶段三种简化计算方法。在此基础上，分析了结构及构件受力层间位移沿高度的变化规律。 通过4类场地条件下地震波时程分析，研究了弹性及弹塑性单自由度体系地震输入能量谱，并分析了结构参数及地震动参数的影响。研究表明，能量谱曲线可分上升段、平台段、下降段及平滑段；结构阻尼比比值与能量谱均值比值呈线性关系；地震波频谱特性影响能量谱峰值平台的长短及出现位置；能量谱数值与峰值加速度增大倍数的平方成正比。根据能量谱曲线的特征，建议了四段式的能量谱简化计算公式以及曲线参数的确定方法。对于多自由度体系，，建议采用多阶振型组合的方法计算总输入能。 通过选用一定数量的地震波对9个不同结构特性的钢筋混凝土框架-核心筒结构进行时程分析，研究了此类结构在地震作用下的总输入能及其在滞回耗能和阻尼耗能之间的分配规律，滞回耗能与结构动力特性以及地震动参数的关系，滞回耗能在构件及层间的分布规律。通过参数分析及回归拟合的方法得到能够反映结构刚度特征值、连梁与剪力墙线刚度比和结构周期等因素的滞回耗能比以及滞回耗能层间分布规律的简化计算公式。 在分析现有损伤模型的基础上，提出了针对钢筋混凝土框架-核心筒结构的双参数损伤指标，并验证了损伤模型的合理性。通过推覆分析及时程分析结果，研究了结构抗震性能及整体损伤模式，并通过参数分析研究了不同结构参数对抗震性能以及损伤模式的影响，从而提出钢筋混凝土框架-核心筒合理损伤模式。
[Abstract]:In recent years, the concrete frame-core tube structure has been widely used in high-rise buildings. However, there are few researches on its nonlinear behavior and damage under earthquake action at home and abroad, which can not meet the needs of development. It is of great significance to study the seismic failure mechanism, seismic performance and seismic damage of reinforced concrete frame-core tube structure. In this paper, the method of theoretical analysis and numerical simulation is used to study the deformation and energy response of reinforced concrete frame-core tube structures by means of nonlinear seismic response analysis of structures. The following research work has been carried out: aiming at the existing problems of deformation control of flexural structures in the current code, combining with the standards of the performance level of reinforced concrete structures at home and abroad, The performance level of reinforced concrete frame-core tube structure is divided into five grades: good use, continuous use, temporary use, suspension and close to collapse. The seismic fortification targets of reinforced concrete frame-core tube structures are established according to the four seismic action levels. The formulas for calculating the displacement angle of shear wall members under different performance levels are derived. On the basis of statistical analysis of domestic test data, the performance indexes of the displacement angle of the structure and the members are obtained. The lateral displacement mode and deformation composition of reinforced concrete frame-core tube structure are analyzed, and the floor displacement is divided into two parts: the stress layer displacement and the non-stress layer displacement. Three simplified calculation methods of elastic stage and elastic-plastic stage are presented. On the basis of this, the variation law of structure and member's interstory displacement along the height is analyzed. The seismic input energy spectra of elastic and elastoplastic single-degree-of-freedom systems are studied by time-history analysis of seismic waves under four kinds of site conditions, and the effects of structural parameters and ground motion parameters are analyzed. The results show that the energy spectrum curve can be divided into ascending, platform, descending and smooth segments, the ratio of structure damping ratio to the ratio of energy spectrum is linearly related to the ratio of energy spectrum to the average value of energy spectrum, and the characteristics of seismic wave spectrum affect the length and location of the peak energy spectrum platform. The value of the energy spectrum is proportional to the square of the increase of the peak acceleration. According to the characteristics of the energy spectrum curve, the simplified formula for calculating the energy spectrum and the method for determining the parameters of the curve are suggested. For multi-degree of freedom system, it is suggested that the method of multi-order mode combination be used to calculate the total input energy. By selecting a certain number of seismic waves, 9 reinforced concrete frame-core tube structures with different structural characteristics are analyzed in time history. The total input energy and its distribution between hysteretic energy dissipation and damping energy dissipation, the relationship between hysteretic energy dissipation and structural dynamic characteristics and ground motion parameters, and the distribution of hysteretic energy between members and layers are studied. By means of parameter analysis and regression fitting, a simplified formula for calculating the hysteretic energy dissipation ratio, the hysteretic energy dissipation ratio and the distribution law between layers of hysteretic energy dissipation is obtained, which can reflect the eigenvalue of structure stiffness, the ratio of linear stiffness of connecting beam to shear wall, and the structural period. Based on the analysis of the existing damage models, a two-parameter damage index for reinforced concrete frame-core tube structures is proposed, and the rationality of the damage model is verified. Based on the results of time-history analysis of nappe analysis, the aseismic performance and overall damage mode of structures are studied, and the effects of different structural parameters on seismic performance and damage modes are studied by parameter analysis. The reasonable damage mode of reinforced concrete frame-core tube is put forward.
【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】：2013
【分类号】：TU973.17;TU973.31
本文编号：2347182
[Abstract]:In recent years, the concrete frame-core tube structure has been widely used in high-rise buildings. However, there are few researches on its nonlinear behavior and damage under earthquake action at home and abroad, which can not meet the needs of development. It is of great significance to study the seismic failure mechanism, seismic performance and seismic damage of reinforced concrete frame-core tube structure. In this paper, the method of theoretical analysis and numerical simulation is used to study the deformation and energy response of reinforced concrete frame-core tube structures by means of nonlinear seismic response analysis of structures. The following research work has been carried out: aiming at the existing problems of deformation control of flexural structures in the current code, combining with the standards of the performance level of reinforced concrete structures at home and abroad, The performance level of reinforced concrete frame-core tube structure is divided into five grades: good use, continuous use, temporary use, suspension and close to collapse. The seismic fortification targets of reinforced concrete frame-core tube structures are established according to the four seismic action levels. The formulas for calculating the displacement angle of shear wall members under different performance levels are derived. On the basis of statistical analysis of domestic test data, the performance indexes of the displacement angle of the structure and the members are obtained. The lateral displacement mode and deformation composition of reinforced concrete frame-core tube structure are analyzed, and the floor displacement is divided into two parts: the stress layer displacement and the non-stress layer displacement. Three simplified calculation methods of elastic stage and elastic-plastic stage are presented. On the basis of this, the variation law of structure and member's interstory displacement along the height is analyzed. The seismic input energy spectra of elastic and elastoplastic single-degree-of-freedom systems are studied by time-history analysis of seismic waves under four kinds of site conditions, and the effects of structural parameters and ground motion parameters are analyzed. The results show that the energy spectrum curve can be divided into ascending, platform, descending and smooth segments, the ratio of structure damping ratio to the ratio of energy spectrum is linearly related to the ratio of energy spectrum to the average value of energy spectrum, and the characteristics of seismic wave spectrum affect the length and location of the peak energy spectrum platform. The value of the energy spectrum is proportional to the square of the increase of the peak acceleration. According to the characteristics of the energy spectrum curve, the simplified formula for calculating the energy spectrum and the method for determining the parameters of the curve are suggested. For multi-degree of freedom system, it is suggested that the method of multi-order mode combination be used to calculate the total input energy. By selecting a certain number of seismic waves, 9 reinforced concrete frame-core tube structures with different structural characteristics are analyzed in time history. The total input energy and its distribution between hysteretic energy dissipation and damping energy dissipation, the relationship between hysteretic energy dissipation and structural dynamic characteristics and ground motion parameters, and the distribution of hysteretic energy between members and layers are studied. By means of parameter analysis and regression fitting, a simplified formula for calculating the hysteretic energy dissipation ratio, the hysteretic energy dissipation ratio and the distribution law between layers of hysteretic energy dissipation is obtained, which can reflect the eigenvalue of structure stiffness, the ratio of linear stiffness of connecting beam to shear wall, and the structural period. Based on the analysis of the existing damage models, a two-parameter damage index for reinforced concrete frame-core tube structures is proposed, and the rationality of the damage model is verified. Based on the results of time-history analysis of nappe analysis, the aseismic performance and overall damage mode of structures are studied, and the effects of different structural parameters on seismic performance and damage modes are studied by parameter analysis. The reasonable damage mode of reinforced concrete frame-core tube is put forward.
【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】：2013
【分类号】：TU973.17;TU973.31
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