基于刚度退化的钢管混凝土柱抗震性能指标限值研究
发布时间：2019-01-06 06:09
【摘要】：钢管混凝土结构因具有优越的抗震性能在高层建筑中应用广泛,对其在地震作用下的损伤状态进行准确评估是基于性能抗震设计理论应用于钢管混凝土结构抗震设计需要解决的关键问题。现行的《建筑抗震设计规范》(GB 50011-2010)有关抗震性能设计条文主要基于钢筋混凝土结构制定,结构抗震性能评价指标为层间位移角;《钢管混凝土结构技术规范》(GB 50936-2014)基于钢筋混凝土结构和钢结构的层间位移角限值,给出了钢管混凝土结构层间位移角参考值。然而,已有研究表明,层间位移角作为性能指标因不能考虑地震累积损伤对结构抗震性能的影响存在着评价失效的风险。针对上述问题,为了确保钢管混凝土结构的抗震安全,本文选用了基于刚度退化的性能指标参数,参照《建筑抗震设计规范》(GB 50011-2010)性能等级的划分方法,针对圆形钢管混凝土和矩形钢管混凝土柱构件,分别提出基于刚度退化指标的各性能水准门槛值,作为现行规范的补充参考。主要研究内容如下:(1)收集111根钢管混凝土柱构件拟静力试验数据,统计分析本文采用的刚度退化指标对于钢管混凝土柱损伤程度的评价结果,并对比利用层间位移角为性能指标的评估情况,从而验证本文采用的刚度退化指标的有效性。(2)参照《建筑抗震设计规范》(GB 50011-2010)中结构性能水平的划分方法,本文将钢管混凝土柱性能水平划分为基本完好、轻微损坏、中等损坏、严重破坏、倒塌等五个性能水准,并结合钢管的应力状态与钢管混凝土柱构件强度退化程度提出了相应性能水准的判定标准。(3)基于ABAQUS通用有限元分析软件平台,通过其UMAT接口分别编写圆形和矩形钢管混凝土材料本构关系子程序,并建立两类钢管混凝土柱试件的有限元模型,经比对有限元模拟结果与试验结果以检验有限元模型的可靠性。(4)本文通过变化轴压比、长细比、径厚比(宽厚比)、高宽比(仅矩形截面)、混凝土强度及钢材强度等参数,分别设计了144根圆形钢管混凝土柱和144根矩形钢管混凝土柱,利用ABAQUS软件进行两类截面钢管混凝土柱有限元分析,考虑不同参数对构件抗震性能影响。并进一步分析了不同参数对刚度退化性能指标限值的影响。(5)基于圆形和矩形钢管混凝土柱构件有限元分析结果,统计分析了性能水准与各影响因素的相关性,并通过T检验确定关键性参数,在此基础上,建立了两类钢管混凝土柱刚度退化性能指标限值回归计算公式。最后进一步地提出了圆形和矩形钢管混凝土柱5个性能水准的刚度退化指标门槛值。
[Abstract]:Concrete filled steel tube (CFST) structures are widely used in high-rise buildings because of their excellent seismic performance. It is a key problem to evaluate the damage state of concrete filled steel tubular structures based on the theory of performance-based seismic design. The current Code for Seismic Design of buildings (GB 50011-2010) is mainly based on reinforced concrete structures, and the evaluation index of seismic performance of structures is the displacement angle between floors. The Technical Specification for Concrete-filled Steel Tubular structures (GB 50936-2014), based on the interstory displacement angle limit of reinforced concrete structure and steel structure, the reference value of displacement angle between stories of concrete-filled steel tubular structure is given. However, studies have shown that there is a risk of failure due to the failure of seismic cumulative damage. In order to ensure the seismic safety of concrete-filled steel tubular structures, this paper selects the performance index parameters based on stiffness degradation and refers to the classification method of the performance grade of the Code for Seismic Design of buildings (GB 50011-2010). For circular concrete-filled steel tube (CFST) and rectangular concrete-filled steel tubular column (CFST) members, the performance leveling threshold based on stiffness degradation index is put forward, which can be used as a supplementary reference to the current code. The main research contents are as follows: (1) collect the pseudo-static test data of 111 CFST columns, and analyze the evaluation results of the damage degree of CFST columns by the stiffness degradation index used in this paper. The effectiveness of the stiffness degradation index used in this paper is verified by comparing the evaluation results using the interstory displacement angle as the performance index. (2) referring to the partition method of the structural performance level in the Code for Seismic Design of buildings (GB 50011-2010), In this paper, the performance level of concrete-filled steel tubular columns is divided into five performance levels: basic intact, slight damage, moderate damage, serious damage and collapse. Combined with the stress state of steel tube and the strength degradation degree of CFST column members, the criterion of corresponding performance level is put forward. (3) based on the general finite element analysis software platform of ABAQUS, The constitutive relation subprograms of circular and rectangular concrete-filled steel tube materials are compiled by its UMAT interface, and the finite element models of two kinds of concrete filled steel tubular columns are established. The reliability of the finite element model is verified by comparing the results of finite element simulation and test. (4) by changing axial compression ratio, aspect ratio, ratio of diameter to thickness (ratio of width to thickness), ratio of aspect to width (only rectangular section), In this paper, 144 circular concrete-filled steel tubular columns and 144 rectangular concrete-filled steel tubular columns are designed, and the finite element analysis of concrete filled steel tubular columns with two kinds of sections is carried out by using ABAQUS software. The effect of different parameters on seismic behavior of members is considered. Furthermore, the influence of different parameters on the limited value of stiffness degradation performance index is analyzed. (5) based on the finite element analysis results of circular and rectangular concrete-filled steel tubular column members, the correlation between the performance level and the influencing factors is analyzed statistically. On the basis of T test, two kinds of regression formulas for stiffness degradation performance index of concrete-filled steel tubular columns are established. Finally, the stiffness degradation threshold of circular and rectangular concrete-filled steel tubular columns is proposed.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9;TU352.11
本文编号：2402443
[Abstract]:Concrete filled steel tube (CFST) structures are widely used in high-rise buildings because of their excellent seismic performance. It is a key problem to evaluate the damage state of concrete filled steel tubular structures based on the theory of performance-based seismic design. The current Code for Seismic Design of buildings (GB 50011-2010) is mainly based on reinforced concrete structures, and the evaluation index of seismic performance of structures is the displacement angle between floors. The Technical Specification for Concrete-filled Steel Tubular structures (GB 50936-2014), based on the interstory displacement angle limit of reinforced concrete structure and steel structure, the reference value of displacement angle between stories of concrete-filled steel tubular structure is given. However, studies have shown that there is a risk of failure due to the failure of seismic cumulative damage. In order to ensure the seismic safety of concrete-filled steel tubular structures, this paper selects the performance index parameters based on stiffness degradation and refers to the classification method of the performance grade of the Code for Seismic Design of buildings (GB 50011-2010). For circular concrete-filled steel tube (CFST) and rectangular concrete-filled steel tubular column (CFST) members, the performance leveling threshold based on stiffness degradation index is put forward, which can be used as a supplementary reference to the current code. The main research contents are as follows: (1) collect the pseudo-static test data of 111 CFST columns, and analyze the evaluation results of the damage degree of CFST columns by the stiffness degradation index used in this paper. The effectiveness of the stiffness degradation index used in this paper is verified by comparing the evaluation results using the interstory displacement angle as the performance index. (2) referring to the partition method of the structural performance level in the Code for Seismic Design of buildings (GB 50011-2010), In this paper, the performance level of concrete-filled steel tubular columns is divided into five performance levels: basic intact, slight damage, moderate damage, serious damage and collapse. Combined with the stress state of steel tube and the strength degradation degree of CFST column members, the criterion of corresponding performance level is put forward. (3) based on the general finite element analysis software platform of ABAQUS, The constitutive relation subprograms of circular and rectangular concrete-filled steel tube materials are compiled by its UMAT interface, and the finite element models of two kinds of concrete filled steel tubular columns are established. The reliability of the finite element model is verified by comparing the results of finite element simulation and test. (4) by changing axial compression ratio, aspect ratio, ratio of diameter to thickness (ratio of width to thickness), ratio of aspect to width (only rectangular section), In this paper, 144 circular concrete-filled steel tubular columns and 144 rectangular concrete-filled steel tubular columns are designed, and the finite element analysis of concrete filled steel tubular columns with two kinds of sections is carried out by using ABAQUS software. The effect of different parameters on seismic behavior of members is considered. Furthermore, the influence of different parameters on the limited value of stiffness degradation performance index is analyzed. (5) based on the finite element analysis results of circular and rectangular concrete-filled steel tubular column members, the correlation between the performance level and the influencing factors is analyzed statistically. On the basis of T test, two kinds of regression formulas for stiffness degradation performance index of concrete-filled steel tubular columns are established. Finally, the stiffness degradation threshold of circular and rectangular concrete-filled steel tubular columns is proposed.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9;TU352.11
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