本文關(guān)鍵詞： 多跨連續(xù)剛架拱橋 地震響應(yīng) 反應(yīng)譜分析 動(dòng)力時(shí)程分析　出處：《重慶交通大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：我國(guó)地處歐亞地震帶和環(huán)太平洋地震帶之間,破壞性地震頻繁,地震損失較為嚴(yán)重。橋梁結(jié)構(gòu)作為生命線工程的重要組成部分,在地震發(fā)生后的救援、救災(zāi),和災(zāi)后重建中起到了極為重要的作用。近年來(lái),從震害的調(diào)查結(jié)果來(lái)看出,橋梁結(jié)構(gòu)在地震中的毀壞是十分嚴(yán)重的,且由此產(chǎn)生的次生災(zāi)害帶來(lái)了巨大的損失。 剛架拱橋由于結(jié)構(gòu)簡(jiǎn)潔、造型優(yōu)美等優(yōu)點(diǎn),被大量采用。但是對(duì)于多跨連續(xù)剛架拱橋的動(dòng)力特性,尤其是其地震反應(yīng)特點(diǎn),目前研究的較少。在歷次的地震中,都有剛架拱橋破壞的案例。其中在對(duì)汶川地震中的震害調(diào)查和統(tǒng)計(jì)也發(fā)現(xiàn),多跨連續(xù)剛架拱橋也是橋梁主要震害之一,很具有代表性。 本文在總結(jié)橋梁震害多跨連續(xù)剛架拱橋抗震研究的基礎(chǔ)上,以彭州川西大橋?yàn)楣こ瘫尘?應(yīng)用大型通用軟件ANSYS,建立川西大橋的空間桿系模型,對(duì)該橋梁進(jìn)行了反應(yīng)譜和動(dòng)力時(shí)程分析,主要研究?jī)?nèi)容： ①建立空間模型計(jì)算了橋梁動(dòng)力特性,分別進(jìn)行了反應(yīng)譜分析和動(dòng)力時(shí)程分析,分別對(duì)橋梁進(jìn)行橫橋、順橋和豎向三向輸入方式進(jìn)行地震分析,比較了反應(yīng)譜分析和動(dòng)力時(shí)程分析的差異,并討論多跨連續(xù)剛架拱橋地震反應(yīng)的特點(diǎn)； ②采用汶川地震波針對(duì)川西大橋進(jìn)行了動(dòng)力時(shí)程分析,討論了在汶川地震作用下多跨連續(xù)剛架橋梁的可能破壞位置； ③針對(duì)加固后的橋梁建立模型,計(jì)算了加固后的橋梁動(dòng)力特性,并對(duì)橋梁進(jìn)行了反應(yīng)譜分析；對(duì)比了加固前后的川西大橋的動(dòng)力反應(yīng)和反應(yīng)譜分析結(jié)果。最后對(duì)橋梁的薄弱位置—拱腿、斜撐進(jìn)行抗彎強(qiáng)度驗(yàn)算,并對(duì)多跨連續(xù)剛架橋梁加固后的性能進(jìn)行評(píng)價(jià)。 通過(guò)對(duì)川西大橋進(jìn)行地震反應(yīng)分析,總結(jié)了該類(lèi)橋梁的地震響應(yīng)特點(diǎn),為以后該類(lèi)橋梁的抗震設(shè)計(jì)提供參考。
[Abstract]:China is located between the Eurasian seismic belt and the Pacific Rim seismic belt, with frequent destructive earthquakes and serious earthquake losses. As an important part of lifeline engineering, bridge structure is an important part of rescue and disaster relief after the earthquake. In recent years, from the survey results of earthquake damage, the damage of bridge structure in the earthquake is very serious, and the resulting secondary disasters have brought huge losses. Rigid arch bridges are widely used because of their simple structure and beautiful shape. However, the dynamic characteristics of multi-span continuous rigid arch bridges, especially their seismic response characteristics, are seldom studied at present. Among them, the investigation and statistics of earthquake damage in Wenchuan earthquake also found that multi-span continuous rigid arch bridge is also one of the main damage of bridge, which is very representative. On the basis of summarizing the seismic research of multi-span continuous rigid frame arch bridge caused by earthquake damage, taking the Pengzhou Western Sichuan Bridge as the engineering background, the spatial bar model of the bridge is established by using the large-scale universal software ANSYS. The response spectrum and dynamic time history of the bridge are analyzed. 1. The dynamic characteristics of the bridge are calculated by establishing the spatial model, and the response spectrum analysis and dynamic time history analysis are carried out respectively, and the seismic analysis of the bridge is carried out in the transverse bridge, the forward bridge and the vertical three direction input mode, respectively. The difference between response spectrum analysis and dynamic time history analysis is compared, and the characteristics of seismic response of multi-span continuous rigid arch bridge are discussed. Using Wenchuan seismic wave to analyze the dynamic time history of the bridge in west Sichuan, the possible damage position of the multi-span continuous rigid frame bridge under the Wenchuan earthquake is discussed. (3) for the strengthened bridge, the dynamic characteristics of the strengthened bridge are calculated, and the response spectrum of the bridge is analyzed. The results of dynamic response and response spectrum analysis of the bridge before and after reinforcement are compared. Finally, the flexural strength of the weak position of the bridge-arch leg and inclined brace is checked, and the performance of the multi-span continuous rigid frame bridge after reinforcement is evaluated. Based on the seismic response analysis of the western Sichuan Bridge, the characteristics of the seismic response of this kind of bridge are summarized, which provides a reference for the seismic design of this kind of bridge in the future.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U445.72

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本文編號(hào)：1509987