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

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

【摘要】：大跨度公鐵兩用斜拉橋,其結(jié)構(gòu)相對(duì)普通橋梁要復(fù)雜,由于其跨越能力強(qiáng),在大跨度橋型方案比選時(shí)候往往受到青睞。然而,我國(guó)是一個(gè)地震多發(fā)的國(guó)家,幾乎每年都有大大小小的地震發(fā)生,且對(duì)于大跨度斜拉橋的地震易損性及其地震風(fēng)險(xiǎn)的研究目前尚處初級(jí)階段,更沒(méi)有比較全面的規(guī)范或經(jīng)驗(yàn)可循。基于上述原因,文章以某大跨度公鐵兩用斜拉橋?yàn)楣こ瘫尘?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(jiǎn)支梁、連續(xù)梁和高墩剛構(gòu)橋的地震易損性和風(fēng)險(xiǎn)分析的方法,提出該橋的損傷指標(biāo),選擇合理易損性分析的方法,對(duì)該橋梁進(jìn)行大跨度斜拉橋地震易損性和風(fēng)險(xiǎn)分析。通過(guò)對(duì)高墩、高塔斜拉橋結(jié)構(gòu)進(jìn)行縱、橫向地震易損性和風(fēng)險(xiǎn)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?jī)?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(guò)渡墩等高塔高墩結(jié)構(gòu)的損傷指標(biāo);以墩梁相對(duì)位移定義過(guò)渡墩、輔助墩支座的損傷指標(biāo)。(2)以實(shí)際大跨度斜拉橋?yàn)樗憷?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(duì)OpenSEES有限元模型進(jìn)行驗(yàn)證,證明模型建立的正確性。(3)選擇20條符合場(chǎng)地特征的地震波,以PGA(地震峰值加速度)為參數(shù),同時(shí)考慮p-△效應(yīng),分別進(jìn)行單條地震波IDA分析和多條地震波彈塑性時(shí)程分析,得到沿墩(塔)高的縱、橫向的軸力和曲率分布,從而來(lái)確定易損性分析控制截面。(4)考慮地震動(dòng)的不確性,分別輸入20條地震波進(jìn)行IDA分析,統(tǒng)計(jì)處理計(jì)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(duì)大跨度斜拉橋主要受力構(gòu)件(主塔、塔橫梁、輔助墩、過(guò)渡墩、支座)易損性分析。比較分析結(jié)果,針對(duì)斜拉橋各構(gòu)件的易損部位和各構(gòu)件的損傷次序等進(jìn)行分析探討。(6)研究我國(guó)不同烈度地區(qū)的地震危險(xiǎn)性,根據(jù)易損性的分析結(jié)果和風(fēng)險(xiǎn)分析表達(dá)式,對(duì)大跨度公鐵兩用斜拉橋進(jìn)行概率地震風(fēng)險(xiǎn)分析,分析風(fēng)險(xiǎn)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(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)】：U442.55;U448.27

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本文編號(hào)：1395849