近場(chǎng)地震作用下基于IDA的鋼框架地震易損性研究
發(fā)布時(shí)間：2018-08-26 14:45
【摘要】：我國(guó)地震斷層分布復(fù)雜、數(shù)量繁多,許多城市不可避免的位于地震帶或斷層附近。眾多震害現(xiàn)象表明位于近場(chǎng)區(qū)的建筑結(jié)構(gòu)物較一般場(chǎng)在地震時(shí)發(fā)生破壞的程度嚴(yán)重。目前近場(chǎng)地震動(dòng)對(duì)結(jié)構(gòu)物抗震性能影響的研究主要是定性的判斷分析。本文選用鋼框架結(jié)構(gòu),采用基于IDA(Incremental Dynamic Analysis,增量動(dòng)力分析)的地震易損性分析方法,研究鋼框架模型在近場(chǎng)及一般場(chǎng)地震動(dòng)作用下超越各種極限狀態(tài)的損傷概率,從概率意義上描述近場(chǎng)地震動(dòng)對(duì)鋼框架結(jié)構(gòu)抗震性能的影響。在地震易損性計(jì)算的過(guò)程中討論離散性參數(shù)的取值。主要研究工作及成果如下:(1)運(yùn)用有限元軟件OpenSees建立6層鋼框架結(jié)構(gòu)有限元模型,分別選用12條近場(chǎng)和12條一般場(chǎng)地震動(dòng)進(jìn)行IDA分析。從IDA分析結(jié)果知:在單條地震動(dòng)作用下的IDA曲線可分為軟化型、過(guò)渡軟化型和硬化型三種類型;模型在相同地震動(dòng)峰值加速度作用下,在一般場(chǎng)地震動(dòng)作用下最大層間位移角遠(yuǎn)小于近場(chǎng)地震動(dòng)。(2)運(yùn)用結(jié)構(gòu)地震易損性方法對(duì)鋼框架模型在近場(chǎng)和一般場(chǎng)地震動(dòng)下進(jìn)行地震易損性分析。研究表明,本文鋼框架模型在8度(0.20g)對(duì)應(yīng)的三水準(zhǔn)設(shè)防烈度的近場(chǎng)和一般場(chǎng)地震動(dòng)作用下,其超越倒塌極限狀態(tài)的概率基本滿足要求;本文鋼框架模型在近場(chǎng)地震動(dòng)作用下較一般場(chǎng)更具易損性。(3)對(duì)基于IDA分析結(jié)果的地震易損性分析方法進(jìn)行了公式推導(dǎo)。(4)進(jìn)行地震易損性分析的過(guò)程中,應(yīng)對(duì)場(chǎng)地潛在的地震動(dòng)進(jìn)行近場(chǎng)和一般場(chǎng)區(qū)分,以降低易損性分析的離散性。(5)對(duì)比本文鋼框架模型IDA分析結(jié)果所得易損性函數(shù)的離散性參數(shù)統(tǒng)計(jì)值及美國(guó)耐震規(guī)范HAZUS中的建議值。研究表明,本文IDA分析結(jié)果的離散性參數(shù)統(tǒng)計(jì)值大于建議值。
[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.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU391
本文編號(hào)：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.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU391
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，本文編號(hào)：2205195
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