连续刚构弯桥地震响应及结构参数的影响性研究

发布时间：2018-04-14 04:03

  本文选题：连续刚构弯桥 + 桩土效应　； 参考：《长沙理工大学》2014年硕士论文

【摘要】：我国是一个地震多发的国家,其中西部分布不少的地震带,这些年随着我国西部大开发的推进,交通建设是重中之重,势必要建设很多桥梁。由于西部的山区地形特征,要建设许多弯桥,其中连续刚构弯桥受到了工程师们的青睐,但是目前对这种桥型的动力特性及其地震响应特性的研究还比较少,本文就是基于这种背景对连续刚构弯桥进行抗震性能研究。论文以炎汝高速公路上的一座高墩连续刚构弯桥为工程背景,运用Midas Civil有限元软件建立数值计算模型,同时还模拟了桩土作用,应用抗震基本理论在是否考虑桩土效应工况下进行了动力特性分析、反应谱分析和动力时程分析。论文在运用反应谱法和时程分析法进行地震响应分析时,结合连续刚构弯桥的特点,对比分析了不同曲率半径的弯桥的反应谱响应和动力时程响应,得出响应结果随曲率半径变化的相关规律；改变激励角度后用同样方法进行地震响应分析,进行不同激励方向下的对比分析,找出桥梁的最不利激励方向。论文还对连续刚构弯桥进行了结构参数单因素分析,分别研究了不同墩高、单双肢墩和不同的高跨比对连续刚构弯桥的地震响应影响。结果分析表明,桥梁的墩高对连续刚构弯桥的动力特性及地震响应影响比较明显,说明了墩高这个参数对连续刚构弯桥的地震响应影响比较大,这种影响是不能忽略的；单双肢墩的选择对连续刚构弯桥的地震响应影响也大,双肢墩比单肢墩有着更小的整体刚度,采用双肢墩可使结构的频率降低,可以有效地减小主梁的弯矩和响应的位移,降低了墩底应力；高跨比对连续刚构弯桥的地震响应影响不大,其计算的内力(位移)结果增减都没超过8%,可以不考虑该项参数对结构地震响应的影响。论文在最后对所做的研究工作进行了归纳和总结,提出了该研究方向的需要进一步完善和解决的问题。
[Abstract]:China is an earthquake-prone country, and there are many seismic zones in the west of China. With the development of western China, traffic construction is the most important, and many bridges must be built.Because of the terrain characteristics of mountainous areas in the west, many curved bridges should be built, among which continuous rigid frame curved bridges are favored by engineers. But at present, there are few studies on the dynamic characteristics and seismic response characteristics of this type of bridge.Based on this background, the seismic behavior of continuous rigid frame curved bridge is studied in this paper.In this paper, a continuous rigid frame curved bridge with high piers on Yanru Expressway is used as the engineering background, a numerical model is established by using Midas Civil finite element software, and the effect of pile and soil is also simulated.The dynamic characteristic analysis, response spectrum analysis and dynamic time history analysis are carried out under the condition of whether the pile-soil effect is considered or not.In this paper, the response spectrum response and dynamic time-history response of curved bridge with different curvature radii are compared and analyzed by using response spectrum method and time-history analysis method, combined with the characteristics of continuous rigid frame bending bridge.The correlation law of response results with curvature radius is obtained. After changing the excitation angle, the seismic response analysis is carried out with the same method, and the most unfavorable excitation direction of the bridge is found out by comparing and analyzing the different excitation directions.The single factor analysis of structural parameters of continuous rigid frame curved bridge is also carried out, and the effects of different pier height, single pier and double pier and different ratio of height to span on seismic response of continuous rigid frame curved bridge are studied respectively.The results show that the pier height of the bridge has obvious influence on the dynamic characteristics and seismic response of the continuous rigid frame curved bridge, which indicates that the influence of the pier height on the seismic response of the continuous rigid frame curved bridge can not be ignored.The selection of single and double pier has a great influence on the seismic response of continuous rigid frame bending bridge. The double pier has smaller overall stiffness than the single pier. The frequency of the structure can be reduced by using the double pier, and the bending moment and response displacement of the main beam can be effectively reduced.The ratio of height to span has little effect on the seismic response of the continuous rigid frame bending bridge, and the calculated internal force (displacement) results do not exceed 8, so the influence of this parameter on the seismic response of the structure can be ignored.At the end of this paper, the research work is summarized and the problems that need to be further improved and solved 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
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本文编号：1747606