斜拉橋地震響應時程分析及減震優(yōu)化
發(fā)布時間：2018-09-10 20:08
【摘要】：隨著大跨度橋梁的建設增多,斜拉橋在橋梁工程中得到了大范圍的使用。斜拉橋逐漸成為交通運輸?shù)臉屑~,但是其歷史較短,對其地震響應以及減震研究不是非常成熟。并且斜拉橋的受力形式與其他形式的橋梁不同,其一旦在地震中遭受破壞不僅會造成非常大的經(jīng)濟損失還會給人民的生命安全造成很大的威脅,因此研究其地震響應及減震方法有著非常重要的意義。本文以某斜拉橋為工程背景,建立有限元模型,對其動力響應以及減震措施進行了系統(tǒng)的研究,主要的工作內(nèi)容包括以下幾個方面:(1)綜述了斜拉橋的研究背景以及其發(fā)展和現(xiàn)狀,闡述了斜拉橋的特點以及震害。(2)闡述了斜拉橋的抗震理論、分析方法、地震動的選擇和輸入模式以及減隔震理論及其適用范圍。(3)結(jié)合某斜拉橋工程實例使用有限元軟件ANSYS建立了斜拉橋模型,并對建模過程中主梁、主塔、拉索以及粘滯阻尼器和鉛芯橡膠支座的模擬方法做了詳細的介紹。(4)對斜拉橋模型進行了多種不同組合下地震激勵的動力時程分析,將各種不同方向激勵組合下的結(jié)構(gòu)響應進行分析對比,可知斜拉橋是一種空間性比較強的結(jié)構(gòu),任意一個方向的地震波激勵都會結(jié)構(gòu)的三個方向的運動給帶來影響。因此在進行斜拉橋抗震分析時,要考慮三個不同方向地震激勵的組合。(5)對斜拉橋模型進行三條不同地震波激勵下的響應分析,確定使斜拉橋結(jié)構(gòu)產(chǎn)生最不利響應的地震波為抗震分析時的地震激勵。(6)對斜拉橋三種不同的減震措施即粘滯阻尼器、鉛芯橡膠支座以及粘滯阻尼器+鉛芯橡膠支座進行地震響應分析。并且分別對鉛芯橡膠支座的鉛芯直徑和粘滯阻尼器的阻尼系數(shù)進行了優(yōu)化分析。最后對比分析三種減震措施下結(jié)構(gòu)的地震響應以確定最佳的減震方案。(7)最后對于本文研究的內(nèi)容做了總結(jié),并對其中的不足和進一步的研究方向做了闡述。
[Abstract]:With the increasing construction of long-span bridges, cable-stayed bridges are widely used in bridge engineering. Cable-stayed bridge is gradually becoming the hub of transportation, but its history is relatively short, so the research on its seismic response and damping is not very mature. Moreover, the stress forms of cable-stayed bridges are different from those of other types of bridges. Once damaged in an earthquake, the cable-stayed bridges will not only cause great economic losses, but also pose a great threat to the lives and safety of the people. Therefore, it is of great significance to study its seismic response and damping method. In this paper, the finite element model of a cable-stayed bridge is established, and its dynamic response and seismic absorption measures are systematically studied. The main work includes the following aspects: (1) the research background, development and present situation of cable-stayed bridge are summarized, and the characteristics and earthquake damage of cable-stayed bridge are expounded. (2) the seismic theory and analysis method of cable-stayed bridge are expounded. The selection and input mode of ground motion as well as the theory of seismic isolation and its application scope. (3) the cable stayed bridge model is established with the finite element software ANSYS, and the main beam and main tower in the process of modeling are established with the example of a cable-stayed bridge project. The simulation methods of cable, viscous damper and lead rubber bearing are introduced in detail. (4) dynamic time-history analysis of seismic excitation of cable-stayed bridge model under various combinations is carried out. By analyzing and comparing the structural responses of different direction excitation combinations, it can be seen that cable-stayed bridge is a kind of structure with strong spatial property, and the movement of three directions of the structure will be affected by seismic wave excitation in any direction. Therefore, in the seismic analysis of cable-stayed bridges, the combination of three different directions of earthquake excitation should be considered. (5) the response analysis of the cable-stayed bridge model under three different seismic waves is carried out. The seismic wave that causes the most unfavorable response of the cable-stayed bridge structure is determined to be the seismic excitation in seismic analysis. (6) for the cable-stayed bridge, three kinds of different damping measures, that is, viscous dampers, are considered. The seismic response of lead rubber bearings and viscous dampers are analyzed. The lead diameter of lead rubber bearing and damping coefficient of viscous damper are optimized. Finally, the seismic responses of the structures under three kinds of seismic absorption measures are compared and analyzed to determine the best seismic absorption scheme. (7) at last, the contents of this paper are summarized, and the shortcomings and further research directions are described.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U442.55;U448.27
本文編號：2235487
[Abstract]:With the increasing construction of long-span bridges, cable-stayed bridges are widely used in bridge engineering. Cable-stayed bridge is gradually becoming the hub of transportation, but its history is relatively short, so the research on its seismic response and damping is not very mature. Moreover, the stress forms of cable-stayed bridges are different from those of other types of bridges. Once damaged in an earthquake, the cable-stayed bridges will not only cause great economic losses, but also pose a great threat to the lives and safety of the people. Therefore, it is of great significance to study its seismic response and damping method. In this paper, the finite element model of a cable-stayed bridge is established, and its dynamic response and seismic absorption measures are systematically studied. The main work includes the following aspects: (1) the research background, development and present situation of cable-stayed bridge are summarized, and the characteristics and earthquake damage of cable-stayed bridge are expounded. (2) the seismic theory and analysis method of cable-stayed bridge are expounded. The selection and input mode of ground motion as well as the theory of seismic isolation and its application scope. (3) the cable stayed bridge model is established with the finite element software ANSYS, and the main beam and main tower in the process of modeling are established with the example of a cable-stayed bridge project. The simulation methods of cable, viscous damper and lead rubber bearing are introduced in detail. (4) dynamic time-history analysis of seismic excitation of cable-stayed bridge model under various combinations is carried out. By analyzing and comparing the structural responses of different direction excitation combinations, it can be seen that cable-stayed bridge is a kind of structure with strong spatial property, and the movement of three directions of the structure will be affected by seismic wave excitation in any direction. Therefore, in the seismic analysis of cable-stayed bridges, the combination of three different directions of earthquake excitation should be considered. (5) the response analysis of the cable-stayed bridge model under three different seismic waves is carried out. The seismic wave that causes the most unfavorable response of the cable-stayed bridge structure is determined to be the seismic excitation in seismic analysis. (6) for the cable-stayed bridge, three kinds of different damping measures, that is, viscous dampers, are considered. The seismic response of lead rubber bearings and viscous dampers are analyzed. The lead diameter of lead rubber bearing and damping coefficient of viscous damper are optimized. Finally, the seismic responses of the structures under three kinds of seismic absorption measures are compared and analyzed to determine the best seismic absorption scheme. (7) at last, the contents of this paper are summarized, and the shortcomings and further research directions are described.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U442.55;U448.27
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