考虑桩土效应的大跨度连续刚构桥地震反应分析
发布时间：2018-11-13 17:48
【摘要】：近些年来,在我国快速发展的经济建设中,新型桥梁结构形式不断地涌现,同时也加快了城市桥梁的跨越式发展。怎样保证桥梁在可能发生的地震作用下安全可靠地运行,最大限度地避免人员伤亡,减轻震灾带来的经济财产损失,且设计又不过于保守,成为工程界极其关注的问题,这也对大跨度桥梁的抗震研究提出了许多新的课题。现今,伴随着桥梁设计方法的持续发展完善,按之前抗震方法设计的桥梁,大多存有不同程度的安全隐患。本文以广西某大跨连续刚构桥为工程背景,针对大跨度桥梁抗震性能进行了以下几点的研究：1、综述了大跨度桥梁的抗震设计理论、抗震研究的现状以及存在的一些问题。2、在简述地震响应分析基本理论的同时,对该桥建立了不同的下部结构有限元计算模型,分析计算了该桥的动力性能,求解得出此桥的自振频率和振动模态,探讨了桩土耦合效应对桥梁结构体系动力特性的影响。3、在两种模式的地震动输入下,采用两种不同的有限元模型进行反应谱分析,计算桥梁结构的地震响应,得出分离式承台模型与整体式承台模型相比,抗震性能更佳。再对其进行一致激励时程分析,并与反应谱计算结果进行对比。最后,对全文研究内容进行了总结,通过对不同模型的计算和分析比较,给出了一些结论与建议,并提出了需要进一步研究的一些问题。
[Abstract]:In recent years, in the rapid economic construction of our country, the new type of bridge structure is emerging constantly, and it also accelerates the leapfrog development of urban bridge. How to ensure the bridge to operate safely and reliably under the action of the possible earthquake, to avoid the casualties to the maximum extent, to reduce the economic property loss caused by the earthquake disaster, and the design is not too conservative, has become an extremely concerned problem in the engineering field. This also brings forward many new topics for the seismic research of long-span bridges. Nowadays, with the continuous development and perfection of the bridge design methods, most bridges designed according to the previous aseismic methods have different degrees of potential safety risks. Based on the engineering background of a long-span continuous rigid frame bridge in Guangxi, the seismic performance of long-span bridge is studied as follows: 1. The seismic design theory of long-span bridge is summarized. The present situation of seismic research and some existing problems. 2. The basic theory of seismic response analysis is briefly introduced, and different finite element calculation models of the substructure of the bridge are established, and the dynamic performance of the bridge is analyzed and calculated. The natural vibration frequency and vibration mode of the bridge are obtained, and the influence of pile-soil coupling effect on the dynamic characteristics of the bridge structure system is discussed. 3. Under the ground motion input of the two modes, two different finite element models are used to analyze the response spectrum. The seismic response of the bridge structure is calculated and the seismic performance of the separated cap model is better than that of the integral cap model. Then the consistent excitation time history analysis is carried out, and the results are compared with the results of response spectrum calculation. Finally, the research contents are summarized, and some conclusions and suggestions are given through the calculation and comparison of different models, and some problems that need further study are put forward.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U448.23
，
本文编号：2329917
[Abstract]:In recent years, in the rapid economic construction of our country, the new type of bridge structure is emerging constantly, and it also accelerates the leapfrog development of urban bridge. How to ensure the bridge to operate safely and reliably under the action of the possible earthquake, to avoid the casualties to the maximum extent, to reduce the economic property loss caused by the earthquake disaster, and the design is not too conservative, has become an extremely concerned problem in the engineering field. This also brings forward many new topics for the seismic research of long-span bridges. Nowadays, with the continuous development and perfection of the bridge design methods, most bridges designed according to the previous aseismic methods have different degrees of potential safety risks. Based on the engineering background of a long-span continuous rigid frame bridge in Guangxi, the seismic performance of long-span bridge is studied as follows: 1. The seismic design theory of long-span bridge is summarized. The present situation of seismic research and some existing problems. 2. The basic theory of seismic response analysis is briefly introduced, and different finite element calculation models of the substructure of the bridge are established, and the dynamic performance of the bridge is analyzed and calculated. The natural vibration frequency and vibration mode of the bridge are obtained, and the influence of pile-soil coupling effect on the dynamic characteristics of the bridge structure system is discussed. 3. Under the ground motion input of the two modes, two different finite element models are used to analyze the response spectrum. The seismic response of the bridge structure is calculated and the seismic performance of the separated cap model is better than that of the integral cap model. Then the consistent excitation time history analysis is carried out, and the results are compared with the results of response spectrum calculation. Finally, the research contents are summarized, and some conclusions and suggestions are given through the calculation and comparison of different models, and some problems that need further study are put forward.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U448.23
，
本文编号：2329917
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