单索面塔梁墩固结体系斜拉桥地震反应分析

发布时间：2018-03-31 18:52

本文选题：斜拉桥　切入点：参数识别　出处：《华南理工大学》2014年硕士论文

【摘要】：大跨度斜拉桥造价高昂、社会功能重要，通常是交通线路的枢纽工程，确保其抗震安全性非常重要。范和港大桥是一座主跨300m的双塔单索面塔、梁、墩固结体系斜拉桥，在同等跨度的斜拉桥中并不常见。范和港大桥地位重要、结构形式特殊、且桥址位于地震烈度7度区，所以，对其进行地震反应分析极具意义。 (1)本文对桥梁地震反应分析的几种常用方法：反应谱分析方法、时程分析方法、Pushover分析方法进行了研究和总结，推导了多点激励下结构动力平衡方程； (2)采用基于Kriging模型的改进响应面法识别范和港斜拉桥的主梁参数，其后，应用有限元分析软件ANSYS建立范和港大桥的动力模型并完成模态分析，获取了范和港大桥的前300阶频率及其动力特性； (3)以《公路桥梁抗震设计细则》(JTG/T B02-01-2008)中的设计加速度反应谱作为输入，进行了一致激励下范和港大桥的地震反应谱分析。由于范和港大桥频谱密集，模态合并采用CQC法(完全二次组合法)。进一步采用时程分析方法对范和港大桥进行了一致激励下的地震反应分析，并与反应谱分析的结果相互对比； (4)在纵向+竖向地震作用下，时程分析获取的塔顶纵向位移、主塔底部绕横桥向弯矩分别为3.20E-02m、1.21E+05kN.m，反应谱分析的结果为2.50E-02m、7.17E+04kN.m，在横向+竖向地震作用下，时程分析获取的塔顶横向位移、主塔底部绕纵桥向弯矩分别为1.73E-01m、8.16E+04kN.m，反应谱分析的结果为1.12E-01m、5.64E+04kN.m； (5)地震动的空间变化对大跨度斜拉桥的地震响应有重要影响，因此，进行了非一致励激下范和港大桥的地震反应分析。
[Abstract]:Long-span cable-stayed bridge is of high cost and important social function. It is usually a pivotal project of traffic lines, so it is very important to ensure its aseismic safety. Fan he Gang Bridge is a cable-stayed bridge with double towers, single cable plane tower, beam and piers with a main span of 300m. It is not common in cable-stayed bridges with the same span. The Fan-he Hong Kong Bridge is very important, the structure is special, and the site of the bridge is located in the area of seismic intensity of 7 degrees, so it is of great significance to analyze the seismic response of the bridge. 1) in this paper, several common methods of bridge seismic response analysis are studied and summarized, such as response spectrum analysis method, time-history analysis method and pushover analysis method, and the structural dynamic equilibrium equation under multi-point excitation is deduced. Secondly, the improved response surface method based on Kriging model is used to identify the main girder parameters of the Fan and Hong Kong cable-stayed bridge. Then, the dynamic model of the Fan he Hong Kong Bridge is established by using the finite element analysis software ANSYS and the modal analysis is completed. The first 300 frequency and its dynamic characteristics of Fan he Hong Kong Bridge are obtained. The seismic response spectrum of Fan he Hong Bridge under uniform excitation is analyzed by using the acceleration response spectrum in JTG / T B02-01-2008). Because the frequency spectrum of Fan he Hong Kong Bridge is dense, The CQC method (complete quadratic combination method) is used to analyze the seismic response of Fan he Hong Kong Bridge under uniform excitation, and the results are compared with the results of response spectrum analysis. 4) under the action of longitudinal vertical earthquake, the longitudinal displacement of the tower top obtained by time-history analysis is 3.20E-02mg / m, 1.21E / 05kN.mrespectively, and the result of response spectrum analysis is 2.50E-02m/ 7.17E04kN.m. under the lateral vertical earthquake, The transverse displacement of the tower top obtained by time-history analysis is 1.73E-01mU 8.16E 04kN.m respectively, and the response spectrum analysis results are 1.12E-01mnmn.64E 04kN.mrespectively. The bending moment of the main tower bottom around the longitudinal bridge is 1.73E-01mg, and the response spectrum analysis results are 1.12E-01mand 5.64E, respectively. The spatial variation of ground motion has an important influence on the seismic response of long-span cable-stayed bridge. Therefore, the seismic response of Fan he Hong Bridge under non-uniform excitation is analyzed.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27;U442.55

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