【摘要】：在近年來的幾次較大地震中,大量的橋梁結(jié)構(gòu)遭到破壞,橋梁結(jié)構(gòu)的抗震安全問題越來越受到人們的重視。地震災(zāi)害調(diào)查表明：除了地震等級(jí)外,橋梁結(jié)構(gòu)所處的場地條件也是影響橋梁結(jié)構(gòu)安全的重要因素之一,對處于可液化場地的橋梁進(jìn)行抗震分析已經(jīng)成為一個(gè)重要的工程問題。論文針對處于可液化場地的某鐵路三跨連續(xù)梁-拱組合橋梁,為了考察樁-土相互作用及樁基土液化對結(jié)構(gòu)地震響應(yīng)的影響,利用ANSYS有限元計(jì)算軟件,分別建立基于m值法和基于P-Y曲線法的全樁模型Ⅱ和模型Ⅲ,墩底固結(jié)模型Ⅰ。并使用ANSYS有限元軟件,對各個(gè)模型進(jìn)行振動(dòng)特性計(jì)算分析、地震反應(yīng)譜和時(shí)程計(jì)算分析。通過模型Ⅰ和模型Ⅱ?qū)Ρ确治隽藰?土相互作用對橋梁振動(dòng)特性的影響和地震響應(yīng)的影響。通過模型Ⅱ和模型Ⅲ對比分析了液化土及其非線性對橋梁結(jié)構(gòu)地震響應(yīng)的影響。結(jié)合對結(jié)構(gòu)地震響應(yīng)的分析總結(jié),指出了該橋的抗震薄弱環(huán)節(jié)。計(jì)算結(jié)果表明：3個(gè)有限元模型的基本振型相同,面外橫向側(cè)彎為該橋的基本振型。全樁模型Ⅱ和Ⅲ前5振型分布特點(diǎn)一致,表明模型對比分析方式和P-Y曲線法應(yīng)用的合理性。模型Ⅰ、Ⅱ和Ⅲ的一階頻率分別為0.83669、0.51895、0.50278,考慮樁-液化土相互作用后,結(jié)構(gòu)頻率降低。拱頂橫向位移反應(yīng)譜計(jì)算值分別為0.00518m、0.0211m和0.0216m,時(shí)程計(jì)算值分別為0.00513m、0.0203m和0.0221m,考慮樁-土相互作用及液化土非線性后,結(jié)構(gòu)關(guān)鍵位置位移響應(yīng)值進(jìn)一步增大。
[Abstract]:In recent years, a large number of bridge structures have been damaged in several major earthquakes, and people pay more and more attention to the seismic safety of bridge structures. The investigation of earthquake disaster shows that the site condition of bridge structure is also one of the important factors that affect the safety of bridge structure, besides the earthquake magnitude, the seismic analysis of bridge in liquefiable site has become an important engineering problem. In order to investigate the influence of pile-soil interaction and pile-soil liquefaction on seismic response of a railway three-span continuous beam-arch composite bridge in liquefiable site, ANSYS finite element calculation software is used in this paper. Based on m-value method and P-Y curve method, the full pile model 鈪，

本文編號(hào)：2418485