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为解决大跨度桥梁结构的抗震性能问题,以六库怒江大桥为研究背景,采用MIDAS/CIVIL有限元软件,建立三跨混凝土连续梁桥有限元模型,在考虑地震动的行波效应情况下,对大跨度连续梁桥进行地震反应分析,得出相应桥梁结构的地震响应,并对其结果进行对比分析.结果表明:在采用不同的视波速情况下,大跨度桥梁结构的地震响应存在着很大的不同,当地震动的视波速相对越小,结构的响应的延迟现象就越明显,伴随着视波速的增加,延迟效应逐渐好转,桥梁结构的内力和位移随着视波速大致规律是先减小后增大,最后趋于平缓.
In order to solve the seismic performance of long-span bridge structures, the finite element model of the three-span concrete continuous girder bridge is established by using MIDAS / CIVIL finite element software with Liuku Nu River Bridge as an example. Considering the traveling wave effect of the earthquake, The seismic responses of the long-span continuous girder bridge are analyzed and the corresponding seismic response of the bridge structure is obtained, and the results are compared and analyzed.The results show that the seismic responses of the long-span bridge structure are quite different under different apparent velocities The larger the local vibration, the smaller the apparent apparent velocity is and the more obvious the delayed response of the structure. With the increase of apparent velocity, the delay effect gradually improves. The internal force and displacement of the bridge structure decrease first with the general rule of apparent velocity After the small increase, and finally tends to be gentle.