【摘要】：隨著我國(guó)成為世界第二大經(jīng)濟(jì)體,城市交通流量與日俱增。為了解決或緩和交通擁堵問(wèn)題,近年來(lái)許多城市修建了大量的多支分叉曲線橋梁,其建筑形式優(yōu)美,行車順暢,與環(huán)境協(xié)調(diào)。但是,這類橋梁結(jié)構(gòu)組成復(fù)雜,連接部位較多,受力遠(yuǎn)比直線梁橋復(fù)雜,在強(qiáng)烈地震下,會(huì)產(chǎn)生多維碰撞或倒塌破壞,其地震反應(yīng)和抗震性能是當(dāng)前研究的重要課題,意義重大。本文通過(guò)制作實(shí)體模型進(jìn)行多維地震模擬振動(dòng)臺(tái)試驗(yàn)、建立有限元模型進(jìn)行仿真分析等方法,對(duì)人字形分枝曲線橋梁進(jìn)行地震反應(yīng)分析和抗震性能研究。(1)探討了國(guó)內(nèi)外曲線橋梁的震害特點(diǎn)和發(fā)展現(xiàn)狀,結(jié)合振動(dòng)臺(tái)試驗(yàn)對(duì)曲線橋梁在多維地震過(guò)程中的震害現(xiàn)象進(jìn)行分析研究,對(duì)該類橋梁的震害規(guī)律進(jìn)行總結(jié)。(2)探討了多維地震作用下的抗震理論在曲線橋梁設(shè)計(jì)和分析中的應(yīng)用問(wèn)題。探討了一致激勵(lì)下曲線橋梁多維地震理論,對(duì)多維地震分析方法進(jìn)行總結(jié),主要方法有:多維反應(yīng)譜法和多維時(shí)程分析法。(3)設(shè)計(jì)并制作了縮尺比例為1/20的人字形分枝曲線橋梁實(shí)體模型,進(jìn)行單點(diǎn)多向地震模擬振動(dòng)臺(tái)試驗(yàn),分析了模型結(jié)構(gòu)墩頂順橋向加速度和梁體跨中加速度、墩梁相對(duì)位移和鄰梁相對(duì)位移、橋墩墩底應(yīng)變等動(dòng)力響應(yīng);分析了梁體和橋墩裂縫分布規(guī)律和開(kāi)展原因;直線橋和曲線橋在不同烈度地震作用下動(dòng)力響應(yīng)區(qū)別;通過(guò)試驗(yàn)數(shù)據(jù)分析了單向、雙向和三向地震作用對(duì)模型橋梁地震反應(yīng)的影響。(4)通過(guò)大型有限元軟件建立人字形分枝曲線橋梁動(dòng)力計(jì)算模型,輸入加速度峰值500gal的El-Centro波,分析了順橋向墩頂加速度、鄰梁相對(duì)位移、墩頂軸力和剪力、梁體跨中彎矩和扭矩等動(dòng)力響應(yīng),發(fā)現(xiàn)三向和雙向地震波輸入下的加速度、相對(duì)位移和內(nèi)力響應(yīng)較單向地震下響應(yīng)大,充分說(shuō)明了多維地震的危害性更大。為使結(jié)構(gòu)地震反應(yīng)計(jì)算結(jié)果符合客觀實(shí)際,確保結(jié)構(gòu)的安全性和可靠性,建議設(shè)計(jì)分枝曲線橋梁時(shí),必須進(jìn)行多維多向地震反應(yīng)分析。
[Abstract]:With China becoming the second largest economy in the world, urban traffic volume is increasing day by day. In order to solve or alleviate the problem of traffic congestion, in recent years, a large number of bifurcation curve bridges have been built in many cities. However, this kind of bridge structure has complex composition, many connecting sites, and the force is much more complicated than that of the linear beam bridge. Under the strong earthquake, the multi-dimensional impact or collapse will occur. The seismic response and seismic performance of this kind of bridge is an important subject in the current research. It is of great significance. In this paper, by making solid model to carry out shaking table test of multi-dimensional seismic simulation, the finite element model is established for simulation and analysis. Seismic response analysis and seismic performance study of herringbone branched curved bridges are carried out. (1) the characteristics and development of seismic damage of curved bridges at home and abroad are discussed. Combined with shaking table test, the seismic damage phenomenon of curved bridge during multidimensional earthquake is analyzed and studied. The seismic damage law of this kind of bridges is summarized. (2) the application of seismic theory under multidimensional earthquake in the design and analysis of curved bridges is discussed. The multidimensional seismic theory of curved bridge under uniform excitation is discussed, and the method of multidimensional seismic analysis is summarized. The main methods are as follows: multidimensional response spectrum method and multidimensional time-history analysis method. (3) A bridge solid model with a scale of 1 / 20 is designed and fabricated, and the shaking table test of single point multi-directional seismic simulation is carried out. The dynamic responses of the model structure such as the vertical acceleration of the pier top and the mid-span acceleration of the beam, the relative displacement of the pier beam and the relative displacement of the adjacent beam, and the strain at the bottom of the pier are analyzed, and the distribution law of the cracks in the beam body and the pier and the reasons for the crack development are analyzed. The dynamic response of linear bridge and curved bridge under different intensity earthquake is different. The influence of bidirectional and three-direction seismic action on the seismic response of the model bridge. (4) the dynamic calculation model of the herringbone branching curve bridge is established by the large-scale finite element software, the El-Centro wave of the acceleration peak value 500gal is input, and the acceleration of the pier top of the forward bridge is analyzed. The relative displacement of adjacent beams, the axial force and shear force at the top of the pier, the moment and torque in the middle of the beam span, and so on. It is found that the response of the relative displacement and internal force to the acceleration under the three-direction and bi-directional seismic waves is greater than that under the unidirectional earthquake. It fully shows that multidimensional earthquakes are more harmful. In order to ensure the safety and reliability of the structure, it is suggested that the multi-dimensional and multi-directional seismic response analysis should be carried out when designing the branching curve bridge in order to accord with the objective reality and ensure the safety and reliability of the structure.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442.55

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 史志利,李忠獻(xiàn);隨機(jī)地震動(dòng)場(chǎng)多點(diǎn)激勵(lì)下大跨度橋梁地震反應(yīng)分析方法[J];地震工程與工程振動(dòng);2003年04期

2 陳太聰,蘇成,韓大建;復(fù)雜立交系統(tǒng)的有限元建模與抗震分析[J];橋梁建設(shè);2001年06期

3 丁漢山,邵容光,丁大鈞,江瑞齡,周游;異形板橋的樣條子域法分析[J];西安公路交通大學(xué)學(xué)報(bào);1999年02期

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本文編號(hào)：2155675