近场地震作用下基于IDA的钢框架地震易损性研究
发布时间：2018-08-26 14:45
【摘要】：我国地震断层分布复杂、数量繁多,许多城市不可避免的位于地震带或断层附近。众多震害现象表明位于近场区的建筑结构物较一般场在地震时发生破坏的程度严重。目前近场地震动对结构物抗震性能影响的研究主要是定性的判断分析。本文选用钢框架结构,采用基于IDA(Incremental Dynamic Analysis,增量动力分析)的地震易损性分析方法,研究钢框架模型在近场及一般场地震动作用下超越各种极限状态的损伤概率,从概率意义上描述近场地震动对钢框架结构抗震性能的影响。在地震易损性计算的过程中讨论离散性参数的取值。主要研究工作及成果如下:(1)运用有限元软件OpenSees建立6层钢框架结构有限元模型,分别选用12条近场和12条一般场地震动进行IDA分析。从IDA分析结果知:在单条地震动作用下的IDA曲线可分为软化型、过渡软化型和硬化型三种类型;模型在相同地震动峰值加速度作用下,在一般场地震动作用下最大层间位移角远小于近场地震动。(2)运用结构地震易损性方法对钢框架模型在近场和一般场地震动下进行地震易损性分析。研究表明,本文钢框架模型在8度(0.20g)对应的三水准设防烈度的近场和一般场地震动作用下,其超越倒塌极限状态的概率基本满足要求;本文钢框架模型在近场地震动作用下较一般场更具易损性。(3)对基于IDA分析结果的地震易损性分析方法进行了公式推导。(4)进行地震易损性分析的过程中,应对场地潜在的地震动进行近场和一般场区分,以降低易损性分析的离散性。(5)对比本文钢框架模型IDA分析结果所得易损性函数的离散性参数统计值及美国耐震规范HAZUS中的建议值。研究表明,本文IDA分析结果的离散性参数统计值大于建议值。
[Abstract]:The distribution of seismic faults in China is complicated and the number of them is various. Many cities are inevitably located near seismic zones or faults. Many earthquake damage phenomena show that the damage of building structures in near-field area is more serious than that in general field. At present, the effect of near-field ground motion on seismic performance of structures is mainly qualitative analysis. In this paper, the seismic vulnerability analysis method based on IDA (Incremental Dynamic Analysis, incremental dynamic analysis is used to study the damage probability of steel frame model under near-field and general site vibration. The effect of near-field ground motion on seismic behavior of steel frame structures is described in the sense of probability. The values of discrete parameters are discussed in the course of seismic vulnerability calculation. The main research work and results are as follows: (1) the finite element model of six-story steel frame structure is established by using finite element software OpenSees, and 12 near-field and 12 general site vibrations are selected for IDA analysis respectively. The results of IDA analysis show that the IDA curves under the action of single seismic motion can be divided into three types: softening type, transitional softening type and hardening type, and the model is under the same peak acceleration of ground motion. The maximum interstory displacement angle under the action of general site vibration is much smaller than that of near-field ground motion. (2) the seismic vulnerability analysis of steel frame model under near-field and general site vibration is carried out by using the structural seismic vulnerability method. The results show that the probability of exceeding the collapse limit state of the steel frame model is basically satisfied under the near-field and general site vibration action of the three-level fortification intensity corresponding to 8 degrees (0.20g). In this paper, the steel frame model is more vulnerable than the general field under the action of near-site vibration. (3) the formula of seismic vulnerability analysis method based on IDA analysis results is derived. (4) in the process of seismic vulnerability analysis, A near-field and a general field distinction should be made between the potential ground motion of the site, In order to reduce the discreteness of vulnerability analysis. (5) compare the statistical values of the discrete parameters of the vulnerability function obtained from the IDA analysis results of the steel frame model and the suggested values of HAZUS in the American Code for Seismic Resistance. The results show that the statistical value of discrete parameters is larger than the suggested value.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391
本文编号：2205195
[Abstract]:The distribution of seismic faults in China is complicated and the number of them is various. Many cities are inevitably located near seismic zones or faults. Many earthquake damage phenomena show that the damage of building structures in near-field area is more serious than that in general field. At present, the effect of near-field ground motion on seismic performance of structures is mainly qualitative analysis. In this paper, the seismic vulnerability analysis method based on IDA (Incremental Dynamic Analysis, incremental dynamic analysis is used to study the damage probability of steel frame model under near-field and general site vibration. The effect of near-field ground motion on seismic behavior of steel frame structures is described in the sense of probability. The values of discrete parameters are discussed in the course of seismic vulnerability calculation. The main research work and results are as follows: (1) the finite element model of six-story steel frame structure is established by using finite element software OpenSees, and 12 near-field and 12 general site vibrations are selected for IDA analysis respectively. The results of IDA analysis show that the IDA curves under the action of single seismic motion can be divided into three types: softening type, transitional softening type and hardening type, and the model is under the same peak acceleration of ground motion. The maximum interstory displacement angle under the action of general site vibration is much smaller than that of near-field ground motion. (2) the seismic vulnerability analysis of steel frame model under near-field and general site vibration is carried out by using the structural seismic vulnerability method. The results show that the probability of exceeding the collapse limit state of the steel frame model is basically satisfied under the near-field and general site vibration action of the three-level fortification intensity corresponding to 8 degrees (0.20g). In this paper, the steel frame model is more vulnerable than the general field under the action of near-site vibration. (3) the formula of seismic vulnerability analysis method based on IDA analysis results is derived. (4) in the process of seismic vulnerability analysis, A near-field and a general field distinction should be made between the potential ground motion of the site, In order to reduce the discreteness of vulnerability analysis. (5) compare the statistical values of the discrete parameters of the vulnerability function obtained from the IDA analysis results of the steel frame model and the suggested values of HAZUS in the American Code for Seismic Resistance. The results show that the statistical value of discrete parameters is larger than the suggested value.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391
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