【摘要】：世界各地發(fā)生的地震給人類生命財(cái)產(chǎn)造成巨大損失。橋梁作為生命線工程,一旦發(fā)生地震破壞,給搶險(xiǎn)救災(zāi)帶來嚴(yán)重的阻礙。鋼筋混凝土拱橋外形美觀,跨越能力強(qiáng),費(fèi)用低廉,是山區(qū)適宜建造的橋梁結(jié)構(gòu)。至今為止,重慶萬州長江大橋仍是世界上跨度最大的鋼筋混凝土拱橋。歐美、日本、中國等先后對(duì)600m-1000m級(jí)特大跨鋼筋混凝土拱橋進(jìn)行了探索性研究。本文以600m鋼筋混凝土拱橋?yàn)檠芯繉?duì)象,基于OpenSEES軟件,開展地震響應(yīng)及抗震性能研究:①針對(duì)600m鋼筋混凝土拱橋進(jìn)行試設(shè)計(jì)研究,建立橋梁結(jié)構(gòu)的線彈性有限元模型、材料非線性模型以及考慮幾何非線性的材料非線性模型,依據(jù)這三個(gè)模型進(jìn)行動(dòng)力特性對(duì)比研究;在此基礎(chǔ)上,選取20條天然地震波在一致激勵(lì)下施加給結(jié)構(gòu)進(jìn)行IDA分析,選取其中典型地震波的計(jì)算結(jié)果對(duì)結(jié)構(gòu)的地震響應(yīng)值進(jìn)行比較,研究表明材料非線性和幾何非線性對(duì)600m鋼筋混凝土拱橋的內(nèi)力和位移的響應(yīng)影響很大。考慮材料非線性后,在縱向+豎向和橫向+豎向地震作用下,較彈性模型彎矩最大分別增大了44.1%和84.8%;考慮幾何非線性+材料非線性后,在縱向+豎向和橫向+豎向地震作用下,較材料非線性模型彎矩最大分別增大了32.5%和4.4%。②考慮材料非線性和幾何非線性,研究主拱圈鋼筋用量在地震作用下對(duì)主拱圈抗震性能的影響。主拱圈在縱向+豎向以及橫向+豎向地震動(dòng)作用下的地震內(nèi)力響應(yīng)值和位移響應(yīng)值加以對(duì)比分析,結(jié)果表明縱向鋼筋用量的改變?cè)谥鞴叭M(jìn)入非線性以前影響不大,在主拱圈進(jìn)入非線性以后才影響較大;而箍筋用量的改變對(duì)主拱圈的抗震性能影響很大,進(jìn)入非線性的地震動(dòng)峰值加速度發(fā)生了很大改變。③針對(duì)橋道梁采用連續(xù)梁-連續(xù)剛構(gòu)體系(方案A)和設(shè)置T構(gòu)交界墩的連續(xù)梁-連續(xù)剛構(gòu)體系(方案B)兩種方式,研究在不同橋道梁跨徑布置形式下考慮材料非線性和幾何非線性后的地震響應(yīng)分析,對(duì)地震峰值加速度分別為0.1g、0.4g、0.8g和1.2g下的地震內(nèi)力響應(yīng)和位移響應(yīng)加以對(duì)比分析,得出方案A和方案B的較為合理的試設(shè)計(jì)方案,在此基礎(chǔ)上進(jìn)一步就試設(shè)計(jì)方案加以分析比較,得出最優(yōu)的試設(shè)計(jì)方案。
[Abstract]:Earthquakes around the world have caused great loss of human life and property. Bridge as a lifeline project, once the earthquake damage, rescue and relief bring serious obstacles. Reinforced concrete arch bridge is a suitable bridge structure in mountainous area because of its beautiful appearance, strong span ability and low cost. Up to now, Wanzhou Yangtze River Bridge in Chongqing is still the longest span reinforced concrete arch bridge in the world. Europe, America, Japan, China and so on have carried on the exploratory research to the 600m-1000m class super-large span reinforced concrete arch bridge. Taking 600m reinforced concrete arch bridge as the research object, based on OpenSEES software, the seismic response and seismic performance of 600m reinforced concrete arch bridge are studied in this paper. 1 the linear elastic finite element model of the bridge structure is established for the 600m reinforced concrete arch bridge. According to the material nonlinear model and the material nonlinear model considering geometric nonlinearity, the dynamic characteristics of the three models are compared and studied. On this basis, 20 natural seismic waves are selected to be applied to the structure under uniform excitation for IDA analysis, and the calculated results of typical seismic waves are selected to compare the seismic response values of the structures. The results show that material nonlinearity and geometric nonlinearity have great influence on the internal force and displacement response of 600m reinforced concrete arch bridge. Considering the material nonlinearity, the maximum bending moment of the elastic model increases by 44.1% and 84.8%, respectively, under longitudinal and transverse vertical earthquakes. After considering geometric nonlinear material nonlinearity, the maximum bending moment of material nonlinear model is increased by 32.5% and 4.4.2 respectively under longitudinal vertical and transverse vertical earthquake, considering material nonlinearity and geometric nonlinearity, respectively. The effect of reinforcement content on seismic behavior of main arch ring is studied. The internal force response value and displacement response value of the main arch ring under longitudinal and horizontal vertical ground motion are compared and analyzed. The results show that the change of longitudinal steel bar content has little effect before the main arch ring is nonlinear. When the main arch ring is nonlinear, the influence is greater. However, the change of stirrups content has a great influence on the seismic performance of the main arch ring. The peak acceleration of the nonlinear ground motion has changed greatly. (3) the continuous beam-continuous rigid frame system (scheme A) and the continuous beam-continuous rigid frame system (scheme B) with T-frame junction piers are adopted for the bridge beam. The seismic response analysis considering material nonlinearity and geometric nonlinearity in different span arrangement forms of bridge beam is studied. The peak acceleration of the bridge beam is 0. 1 g / 0. 4 g, respectively. The seismic internal force response and displacement response under 0.8 g and 1.2 g are compared and analyzed, and a more reasonable trial design scheme of scheme A and scheme B is obtained. On the basis of this, the experimental design scheme is further analyzed and compared. The optimal trial design was obtained.
【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】：2015
【分類號(hào)】：U442.55;U448.22

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本文編號(hào)：2392843