發(fā)布時間：2019-06-13 13:02

【摘要】：大跨度纜索體系橋梁以其強大的跨越能力而成為許多重要交通干線的樞紐,而這些重要的交通干線往往是關系國民經(jīng)濟的生命線工程。我國是一個地震頻發(fā)的國家,保障大跨度橋梁在地震作用下的安全是非常重要的。截止目前,我國興建了許多大跨度橋梁,結構越來越柔,周期越來越長,傳統(tǒng)的抗震方法已經(jīng)難以應付,如何能夠既保證大跨度橋梁的結構安全,又能使設計不致于過分保守,成為目前大跨度橋梁領域的重要課題。本文以蘇通大橋主橋——1088米跨度斜拉橋為研究對象,基于SAP2000有限元程序,對大跨度斜拉橋在地震作用下的地震反應、減隔震方法進行了研究。主要研究內(nèi)容如下:1.大跨度斜拉橋動力特性研究。根據(jù)特征值理論,建立有限元模型,分析大跨度斜拉橋自由振動規(guī)律,根據(jù)模態(tài)分析結果預測地震反應。2.搜集橋址處地質(zhì)資料,按規(guī)范確定加速度設計反應譜,根據(jù)人工合成地震波理論,以三角級數(shù)法編制相應程序合成人工地震波,并進行多維、多角度地震動輸入下大跨度斜拉橋線性及非線性動力時程分析,總結此類橋梁的地震反應規(guī)律。3.考慮地震動空間差異的影響,對大跨度斜拉橋進行考慮行波效應的動力時程分析,并與一致激勵情況對比,研究行波效應對此類橋梁地震反應的影響。4.分析并選擇大跨度斜拉橋的合理抗震措施,分別進行縱向安裝粘滯阻尼器,橫向安裝TMD減震控制系統(tǒng)的動力時程分析,研究其減震效果,并對大跨度斜拉橋的減震措施給出評價。
[Abstract]:Long-span cable system bridge has become the hub of many important traffic trunk lines because of its strong leapfrogging ability, and these important traffic trunk lines are often lifeline projects related to the national economy. China is a country with frequent earthquakes, so it is very important to ensure the safety of long-span bridges under earthquake action. Up to now, many long-span bridges have been built in our country, the structure is more and more flexible, the period is longer and longer, the traditional seismic method has been difficult to cope with. How to not only ensure the structural safety of long-span bridges, but also make the design not too conservative, has become an important topic in the field of long-span bridges. In this paper, the 1088 m span cable-stayed bridge, the main bridge of Sutong Bridge, is taken as the research object, and the seismic response and isolation method of long-span cable-stayed bridge under earthquake are studied based on SAP2000 finite element program. The main research contents are as follows: 1. Study on dynamic characteristics of long-span cable-stayed bridge. According to the eigenvalue theory, the finite element model is established to analyze the free vibration law of long-span cable-stayed bridge, and the seismic response is predicted according to the results of modal analysis. According to the theory of synthetic seismic wave, the corresponding program is compiled to synthesize artificial seismic wave, and the linear and nonlinear dynamic time history analysis of long-span cable-stayed bridge under multi-dimensional and multi-angle ground motion input is carried out, and the seismic response law of this kind of bridge is summarized. Considering the influence of spatial difference of ground motion, the dynamic time history analysis of long-span cable-stayed bridge considering traveling wave effect is carried out, and compared with the uniform excitation, the influence of traveling wave effect on seismic response of this kind of bridge is studied. 4. The reasonable seismic measures of long-span cable-stayed bridge are analyzed and selected, and the dynamic time history analysis of longitudinal installation of viscous dampers and transverse installation of TMD damping control system are carried out, the damping effect is studied, and the damping measures of long-span cable-stayed bridge are evaluated.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U442.55;U448.27

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