高速铁路桥梁地震响应分析与抗震设计方法研究

发布时间：2018-03-27 22:03

本文选题：高速铁路桥梁　切入点：地震响应　出处：《中南大学》2014年硕士论文

【摘要】：摘要：随着设计要求的提高,传统的铁路桥墩简化抗震计算方法和弹性反应谱分析方法已不能满足强震地区桥梁的抗震设计要求,开展更为复杂的弹塑性动力时程响应分析和延性抗震设计已迫在眉睫。数值模拟是桥梁地震响应研究的主要方法之一,本文以大连市某桥梁为依托,开展抗震弹塑性分析方法的关键技术研究。论文主要工作如下： (1)地震作用分析方法研究。总结铁路规范的简化算法、振型分解反应谱法和基于纤维模拟的弹塑性时程分析方法计算原理,进行桥墩截面离散化和纤维网格划分。 (2)多遇地震力作用下铁路连续梁地震响应规律及设计方法研究,通过对横向和纵向多遇地震作用下简化算法、反应谱法和弹性时程分析法的计算结果进行对比分析,得出结论：在多遇纵向地震作用下,三者结果相差不大；多遇横向地震作用下,三种方法中,时程分析法和反应谱法的差异在2.6%以内,简化算法与反应谱法相比计算结果偏小,相对差异在11%-19%,建议尽可能的采用反应谱法或时程分析法进行计算。 (3)罕遇地震力作用下铁路连续梁地震响应规律及设计检算方法研究,通过对纵向作用和横向作用两种工况下反应谱法、弹性时程分析法和弹塑性纤维时程分析法计算结果进行对比分析,发现结果相差较大,采用弹性模型会严重放大墩底的弯矩,用于设计时会增加桥墩截面积和配筋量。得出结论：罕遇地震下采用弹塑性时程法可以更合理地模拟结构的塑性工作状态,建议在设计过程中采用弹塑性模型进行计算。
[Abstract]:Absrtact: with the improvement of design requirements, the traditional simplified seismic calculation method and elastic response spectrum analysis method for railway piers can not meet the seismic design requirements of bridges in strong earthquake areas. It is urgent to develop more complex elastoplastic dynamic time-history response analysis and ductile seismic design. Numerical simulation is one of the main methods of bridge seismic response research. The main work of this paper is as follows:. This paper summarizes the simplified algorithm of railway code, the mode decomposition response spectrum method and the calculation principle of elastic-plastic time-history analysis method based on fiber simulation, and carries on the section discretization and the fiber mesh division of the bridge pier. The seismic response law and design method of railway continuous beam under the action of frequent earthquake force are studied. The calculation results of simplified algorithm, response spectrum method and elastic time-history analysis method under the action of transverse and longitudinal frequent earthquakes are compared and analyzed. It is concluded that under the action of longitudinal earthquakes, the difference among the three methods is not significant, and the difference between the time history analysis method and the response spectrum method is within 2.6%, and the simplified method is less than the response spectrum method in comparison with the response spectrum method. The relative difference is between 11 and 19. It is recommended that the method of response spectrum or time-history analysis be used as far as possible. 3) under the action of rare earthquake force, the seismic response law and design checking method of railway continuous beam are studied, and the response spectrum method under two working conditions, longitudinal action and transverse action, is studied. The results of elastic time-history analysis and elastic-plastic fiber time-history analysis are compared and analyzed. It is found that the results are quite different and the bending moment at the bottom of the pier will be greatly enlarged by using the elastic model. It is concluded that the elastic-plastic time-history method can be used to simulate the plastic working state of the structure more reasonably under rare earthquake. It is suggested that the elastic-plastic model should be used to calculate the structure in the design process.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55

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