本文關(guān)鍵詞：基于不同激勵(lì)方法的大跨度連續(xù)梁橋地震響應(yīng)分析　出處：《遼寧工程技術(shù)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 動(dòng)力特性 反應(yīng)譜法 時(shí)程法 行波效應(yīng)

【摘要】：近年來(lái),我國(guó)地震多發(fā)給人民生命和財(cái)產(chǎn)帶來(lái)嚴(yán)重威脅,橋梁結(jié)構(gòu)是道路交通系統(tǒng)的重要結(jié)構(gòu),是交通運(yùn)輸系統(tǒng)的樞紐工程,橋梁結(jié)構(gòu)的破壞,不僅導(dǎo)致很大的直接經(jīng)濟(jì)損失,而且還會(huì)影響災(zāi)后的重建和生產(chǎn)恢復(fù)工作。本文以六庫(kù)怒江大橋?yàn)檠芯勘尘?從結(jié)構(gòu)的自身動(dòng)力特性、地震動(dòng)的輸入方式、橋梁結(jié)構(gòu)的動(dòng)力響應(yīng)三個(gè)方面出發(fā),應(yīng)用有限元分析方法,采用有限元軟件MIDAS/CIVIL,建立三跨混凝土連續(xù)梁橋有限元模型,分別進(jìn)行反應(yīng)譜一致激勵(lì)、時(shí)程一致激勵(lì)和時(shí)程多點(diǎn)激勵(lì),得出相應(yīng)的橋梁結(jié)構(gòu)的地震響應(yīng),對(duì)反應(yīng)譜一致激勵(lì)、時(shí)程一致激勵(lì)和時(shí)程多點(diǎn)激勵(lì)進(jìn)行對(duì)比分析,得出以下結(jié)論：1.不同的地震波對(duì)橋梁結(jié)構(gòu)的內(nèi)力和位移影響較大,在進(jìn)行橋梁結(jié)構(gòu)抗震分析中必須根據(jù)橋梁結(jié)構(gòu)所處的實(shí)際橋址所處的場(chǎng)地條件選擇與其一致的地震波。2.反應(yīng)譜法建立在一致激勵(lì)的基礎(chǔ)上,不能考慮地震動(dòng)的時(shí)空效應(yīng),只能得出最大響應(yīng)。時(shí)程一致分析法可以得到橋梁結(jié)構(gòu)任意時(shí)刻的地震響應(yīng),也無(wú)法模擬地震動(dòng)的時(shí)空效應(yīng),對(duì)于大跨度連續(xù)梁橋來(lái)講,在進(jìn)行抗震分析時(shí),進(jìn)行時(shí)程多點(diǎn)激勵(lì)更加符合實(shí)際地震動(dòng)的輸入模式。3.為了更為準(zhǔn)確進(jìn)行反應(yīng)譜一致激勵(lì)與時(shí)程一致激勵(lì)進(jìn)行對(duì)比,必須對(duì)所選取的時(shí)程波進(jìn)行調(diào)整,使其調(diào)整為與反應(yīng)譜法相等的有效峰值,這樣便于對(duì)反應(yīng)譜一致激勵(lì)與時(shí)程一致激勵(lì)進(jìn)行對(duì)比分析。4.在時(shí)程多點(diǎn)激勵(lì)中,由于采用了不同的視波速,這樣使得不同視波速的地震波到達(dá)各個(gè)墩底的時(shí)間就存在一定的時(shí)間差,那么在不同的時(shí)差進(jìn)行輸入的情況下,大跨度橋梁結(jié)構(gòu)的地震響應(yīng)存在著很大的不同的,這樣使得時(shí)程多點(diǎn)激勵(lì)與一致激勵(lì)相比各點(diǎn)的振動(dòng)發(fā)生很大的變化,當(dāng)視波速不是很大時(shí)(速度一定大時(shí),時(shí)差可以忽略),則地震動(dòng)的行波效應(yīng)不能被忽略的。5.反應(yīng)譜一致下橋梁結(jié)構(gòu)的各支點(diǎn)剪力和彎矩均大于時(shí)程一致激勵(lì),其中反應(yīng)譜一致激勵(lì)時(shí)支點(diǎn)剪力是時(shí)程一致激勵(lì)的1.071-1.278倍,各跨中彎矩的1.109-1.243倍,然而時(shí)程一致激勵(lì)的位移均大于反應(yīng)譜一致激勵(lì)。
[Abstract]:In recent years, the earthquake sent to people's lives and property in China brings serious threat, bridge structure is an important structure of road traffic system, is the hub of transportation system, the destruction of bridge structure. Not only lead to great direct economic losses, but also affect the reconstruction and production recovery after the disaster. This paper takes Liukunjiang Bridge as the research background, from the structure's own dynamic characteristics, the input mode of ground motion. Based on three aspects of dynamic response of bridge structure, the finite element model of three-span concrete continuous beam bridge is established by using finite element analysis method and Midas / CIVIL-based finite element software. Response spectrum consistent excitation, time-history consistent excitation and time-history multi-point excitation are carried out respectively, and the corresponding seismic response of bridge structure is obtained. The response spectrum consistent excitation, time-history consistent excitation and time-history multi-point excitation are compared and analyzed. The following conclusions are drawn: 1. Different seismic waves have great influence on the internal force and displacement of the bridge structure. In seismic analysis of bridge structure, the seismic wave should be chosen according to the actual site condition of bridge structure. 2. The response spectrum method is based on consistent excitation. The time-history consistent analysis method can get the seismic response of bridge structure at any time, nor can it simulate the space-time effect of ground motion. For long-span continuous beam bridges, seismic analysis is carried out. In order to compare the response spectrum consistent excitation with time-history consistent excitation, the selected time-history wave must be adjusted in order to carry out the time-history multi-point excitation more in line with the actual ground motion input mode .3.In order to more accurately compare the response spectrum consistent excitation and the time-history consistent excitation, the selected time-history wave must be adjusted. It is easy to compare and analyze the response spectrum consistent excitation and time-history consistent excitation. 4. In the time-history multi-point excitation, due to the use of different apparent wave velocities. In this way, there is a certain time difference when the seismic waves with different apparent wave velocities reach the bottom of each pier, so in the case of different time difference input. The seismic response of long-span bridge structure is very different, which makes the vibration of each point change greatly compared with the consistent excitation, when the apparent wave velocity is not very large (when the velocity is certain to be large. If the time difference can be neglected, the traveling wave effect of ground motion can not be ignored. 5. The shear force and bending moment of bridge structure at each fulcrum are larger than that of time-history consistent excitation under the same response spectrum. The fulcrum shear force is 1.071-1.278 times as much as the time-history uniform excitation, and 1.109-1.243 times of the mid-span moment when the response spectrum is consistent. However, the displacement of time-history consistent excitation is larger than that of response spectrum consistent excitation.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U442.55

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 閆斌;戴公連;徐慶元;;行波效應(yīng)下鐵路簡(jiǎn)支梁橋梁軌系統(tǒng)地震響應(yīng)[J];振動(dòng)工程學(xué)報(bào);2013年03期

2 喻梅;賈宏宇;洪浩;鄭史雄;羅楠;;山區(qū)高墩橋梁的多點(diǎn)激勵(lì)隨機(jī)響應(yīng)[J];公路交通科技;2013年06期

3 劉文華;鄢芳華;;大跨度連續(xù)剛構(gòu)橋梁的地震響應(yīng)分析[J];公路;2013年02期

4 韓磊;彭天波;趙藝;;基礎(chǔ)模擬方式對(duì)泰州大橋地震響應(yīng)的影響[J];中國(guó)工程科學(xué);2012年05期

5 才南;;探討橋梁震害及抗震設(shè)計(jì)[J];北方交通;2012年04期

6 趙甲薦;魏德敏;;輕軌箱形橋梁的模態(tài)比較與橋型優(yōu)化[J];公路;2011年11期

7 張開(kāi)銀;王朋;趙桂林;劉文波;;橋梁結(jié)構(gòu)檢測(cè)與評(píng)估中若干動(dòng)力學(xué)應(yīng)用問(wèn)題的研究[J];交通科學(xué)與工程;2011年02期

8 伍松;張新培;高少波;蔣中林;;超長(zhǎng)混凝土框架結(jié)構(gòu)地震反應(yīng)行波效應(yīng)研究[J];世界地震工程;2011年02期

9 何浩祥;閆維明;;多點(diǎn)激勵(lì)下連續(xù)橋梁地震響應(yīng)特性研究[J];防災(zāi)減災(zāi)工程學(xué)報(bào);2011年01期

10 李偉慈;;大跨超長(zhǎng)連續(xù)梁橋縱向抗震設(shè)計(jì)研究[J];北方交通;2010年12期

，

本文編號(hào)：1381752