本文關(guān)鍵詞：大跨度公鐵兩用斜拉橋地震易損性及風險分析　出處：《西南交通大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 大跨度公鐵兩用斜拉橋 損傷指標 地震需求 地震易損性 概率地震風險

【摘要】：大跨度公鐵兩用斜拉橋,其結(jié)構(gòu)相對普通橋梁要復雜,由于其跨越能力強,在大跨度橋型方案比選時候往往受到青睞。然而,我國是一個地震多發(fā)的國家,幾乎每年都有大大小小的地震發(fā)生,且對于大跨度斜拉橋的地震易損性及其地震風險的研究目前尚處初級階段,更沒有比較全面的規(guī)范或經(jīng)驗可循�；谏鲜鲈�,文章以某大跨度公鐵兩用斜拉橋為工程背景,結(jié)合目前已有斜拉橋地震反應(yīng)和易損性的研究現(xiàn)狀,參照一般簡支梁、連續(xù)梁和高墩剛構(gòu)橋的地震易損性和風險分析的方法,提出該橋的損傷指標,選擇合理易損性分析的方法,對該橋梁進行大跨度斜拉橋地震易損性和風險分析。通過對高墩、高塔斜拉橋結(jié)構(gòu)進行縱、橫向地震易損性和風險分析,得出研究結(jié)論,為今后此類研究提供一定參考。文章的主要研究內(nèi)容概括如下:(1)以曲率作為控制參數(shù),定義斜拉橋主塔和輔助墩、過渡墩等高塔高墩結(jié)構(gòu)的損傷指標;以墩梁相對位移定義過渡墩、輔助墩支座的損傷指標。(2)以實際大跨度斜拉橋為算例,基于OpenSEES軟件建立斜拉橋有限元模型,并且闡述各構(gòu)件用何種單元模擬,最后用橋梁專用軟件建立Midas模型對OpenSEES有限元模型進行驗證,證明模型建立的正確性。(3)選擇20條符合場地特征的地震波,以PGA(地震峰值加速度)為參數(shù),同時考慮p-△效應(yīng),分別進行單條地震波IDA分析和多條地震波彈塑性時程分析,得到沿墩(塔)高的縱、橫向的軸力和曲率分布,從而來確定易損性分析控制截面。(4)考慮地震動的不確性,分別輸入20條地震波進行IDA分析,統(tǒng)計處理計算結(jié)果,建立大跨度斜拉橋以PGA為變量的控制截面概率地震需求模型。(5)對大跨度斜拉橋主要受力構(gòu)件(主塔、塔橫梁、輔助墩、過渡墩、支座)易損性分析。比較分析結(jié)果,針對斜拉橋各構(gòu)件的易損部位和各構(gòu)件的損傷次序等進行分析探討。(6)研究我國不同烈度地區(qū)的地震危險性,根據(jù)易損性的分析結(jié)果和風險分析表達式,對大跨度公鐵兩用斜拉橋進行概率地震風險分析,分析風險分析結(jié)果,為以后研究提供參考。
[Abstract]:The structure of large-span double-purpose cable-stayed bridge is more complicated than that of ordinary bridge. Because of its strong span ability, it is often favored in the comparison of large-span bridge scheme. However, China is a country with earthquake. Almost every year, large and small earthquakes occur, and the study of seismic vulnerability and seismic risk of long-span cable-stayed bridges is still in the primary stage. Based on the above reasons, this paper takes a large-span double-purpose cable-stayed bridge as the engineering background, combined with the existing research status of seismic response and vulnerability of cable-stayed bridge. Referring to the methods of seismic vulnerability and risk analysis of simple supported beam, continuous beam and rigid frame bridge with high piers, the damage index of the bridge is put forward and the reasonable vulnerability analysis method is selected. The seismic vulnerability and risk analysis of the long-span cable-stayed bridge are carried out. Through the longitudinal and lateral seismic vulnerability and risk analysis of the tall pier and tall tower cable-stayed bridge structure, the research conclusions are obtained. The main contents of this paper are summarized as follows: (1) take curvature as the control parameter, define the damage index of the tall pier structure of cable-stayed bridge, such as main tower, auxiliary pier, transition pier, etc. Taking the relative displacement of pier beam as the definition of transition pier and the damage index of auxiliary pier support, taking the actual long-span cable-stayed bridge as an example, the finite element model of cable-stayed bridge is established based on OpenSEES software. At last, the Midas model is established by the bridge software to validate the OpenSEES finite element model. The correctness of the model is proved. (3) selecting 20 seismic waves that accord with the site characteristics, taking PGA (earthquake peak acceleration) as the parameter, and considering the p- effect at the same time. IDA analysis of single seismic wave and elastic-plastic time-history analysis of multiple seismic waves are carried out, and the axial and transverse axial force and curvature distribution along the height of pier (tower) are obtained. In order to determine the vulnerability analysis control section. 4) considering the uncertainty of ground motion, 20 seismic waves were input to IDA analysis, and the results of statistical processing were calculated. The probabilistic seismic demand model of long-span cable-stayed bridge with PGA as variable is established. The model is applied to the main components of long-span cable-stayed bridge (main tower, tower beam, auxiliary pier, transition pier). Comparing the results of the analysis, the seismic risk of different intensity areas in China is studied by analyzing the vulnerable parts of cable-stayed bridge and the damage order of each component. According to the results of vulnerability analysis and the expression of risk analysis, the probabilistic seismic risk analysis of large-span double-purpose cable-stayed bridge is carried out, and the result of risk analysis is analyzed, which provides a reference for future research.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U442.55;U448.27

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