【作者】 王朋；

【导师】 史庆轩；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2015， 博士

【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。更多还原

【Abstract】 Hybrid structure has become a main structure of high-rise building in our country, which has the following two advantages. Firstly, steel components, reinforced concrete components and steel-concrete components can be combined effectively. It not only has technical advantages of steel structures, but also has low cost characteristics of concrete. Secondly, hybrid structure has high stiffness, good fire-proof and good durability. Hence, hybrid structure system is a system for high-rise building that conforms to China’s national conditions, and it will have great development in the future.The methods of experimental study and numerical simulation were used in this paper. Firstly, the performance of steel reinforced concrete(SRC) column was investigated experimentally. The factors affecting on seismic behavior of SRC column were analyzed. Then, the model of SRC frame-reinforced concrete(RC) core tube structure was established. The mechanical behavior, distribution of hysteretic energy dissipation and reasonable damage model of structures subjected to earthquake actions were investigated. Specific content are as follows:An experimental investigation of 8 SRC specimen columns was carried out, which included 4 concrete-filled steel square tubular columns and 4 core steel reinforced concrete columns. All specimen columns were designed to have a same cross section of 250mm×250mm, steel ratio and so on. The variables of interest were loading path and forms of steel configuration. The performance of test specimens was discussed in terms of crack pattern, hysteretic response, stiffness degradation, shear strength reduction, ductility and energy dissipation capacity, as well as the strain of steel, longitudinal steel bars and stirrups. On basis of the test data and numerical results, effect of the axial compression ratio, cycle times, incremental displacement amplitude and variable axial force on seismic behavior of SRC columns was investigated.Based on elastic-plastic single degree of freedom(SDOF) system, effects of sites, hysteretic model, stiffness of the strengthening stage, damping ratio, intensity of ground motion on earthquake input energy spectrum(EIES) was investigated. The formula of EIES for elastic-plastic SDOF system was proposed. And elastic-plastic single particle with double degree of freedom(SPDDF) system was established based on two-dimensional yeild surface function. The effect of two axis period ratio on EIES was investigated for elastic-plastic SPDDF system. And the formula of EIES was proposed.Elastic and elastic-plastic time history was carried out for structures under single- and bi-directional earthquake actions. And force distribution of columns, beams, shear walls and coupling beams were investigated, as well as shear force and overturning moment of the structure section. Structural responses such as displacement, velocity and acceleration of the roof and story drift were investigated. And some conclusions were obtained, which will be helpful to the design of high-rise building.Elastic-plastic time history analysis of SRC frame-RC core tube structure was carried out under severe earthquake actions. The studies of proportion of each energy term in the structure were carried out. And the influence of characteristic of ground motion and dynamic characteristics on hysteretic energy was investigated. Computation equation of hysteretic energy dissipation for all components was proposed. And energy distributions for components were investigated in the structure height direction and horizontal direction.Taking the overall coefficient, axial deformation coefficient and stiffness characteristic value as the main design parameters for SRC frame-RC core tube structure, elastic-plastic time history and nonlinear incremental dynamic analysis were carried out for structures under bi-directional rare earthquake actions. Energy distribution and damage pattern of frame-core wall structures were studied. And reasonable damage pattern and the corresponding design advices were given.更多还原