本文選題：斜拉橋　切入點：參數(shù)識別　出處：《華南理工大學(xué)》2014年碩士論文

【摘要】：大跨度斜拉橋造價高昂、社會功能重要，通常是交通線路的樞紐工程，確保其抗震安全性非常重要。范和港大橋是一座主跨300m的雙塔單索面塔、梁、墩固結(jié)體系斜拉橋，在同等跨度的斜拉橋中并不常見。范和港大橋地位重要、結(jié)構(gòu)形式特殊、且橋址位于地震烈度7度區(qū)，所以，對其進(jìn)行地震反應(yīng)分析極具意義。 (1)本文對橋梁地震反應(yīng)分析的幾種常用方法：反應(yīng)譜分析方法、時程分析方法、Pushover分析方法進(jìn)行了研究和總結(jié)，推導(dǎo)了多點激勵下結(jié)構(gòu)動力平衡方程； (2)采用基于Kriging模型的改進(jìn)響應(yīng)面法識別范和港斜拉橋的主梁參數(shù)，其后，應(yīng)用有限元分析軟件ANSYS建立范和港大橋的動力模型并完成模態(tài)分析，獲取了范和港大橋的前300階頻率及其動力特性； (3)以《公路橋梁抗震設(shè)計細(xì)則》(JTG/T B02-01-2008)中的設(shè)計加速度反應(yīng)譜作為輸入，進(jìn)行了一致激勵下范和港大橋的地震反應(yīng)譜分析。由于范和港大橋頻譜密集，模態(tài)合并采用CQC法(完全二次組合法)。進(jìn)一步采用時程分析方法對范和港大橋進(jìn)行了一致激勵下的地震反應(yīng)分析，并與反應(yīng)譜分析的結(jié)果相互對比； (4)在縱向+豎向地震作用下，時程分析獲取的塔頂縱向位移、主塔底部繞橫橋向彎矩分別為3.20E-02m、1.21E+05kN.m，反應(yīng)譜分析的結(jié)果為2.50E-02m、7.17E+04kN.m，在橫向+豎向地震作用下，時程分析獲取的塔頂橫向位移、主塔底部繞縱橋向彎矩分別為1.73E-01m、8.16E+04kN.m，反應(yīng)譜分析的結(jié)果為1.12E-01m、5.64E+04kN.m； (5)地震動的空間變化對大跨度斜拉橋的地震響應(yīng)有重要影響，因此，進(jìn)行了非一致勵激下范和港大橋的地震反應(yīng)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.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.27;U442.55

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