【摘要】：塔梁分離式懸索橋是近年來新出現(xiàn)的一種懸索橋結(jié)構(gòu)形式,為適應(yīng)山區(qū)峽谷地形,減少山體開挖,使結(jié)構(gòu)與地形環(huán)境和諧相容,將主梁支承于山體而非主塔上。這導(dǎo)致主梁長度小于主塔中心距離,并且纜索布置等也相應(yīng)發(fā)生變化,從而引起結(jié)構(gòu)力學(xué)特性相較于主梁支承于主塔的常規(guī)懸索橋發(fā)生一定程度的變化。湖南湘西矮寨大橋是國內(nèi)外首座正式建成的塔梁分離式懸索橋,而在此之前,關(guān)于這種橋式的結(jié)構(gòu)理論很少。近年來圍繞塔梁分離式懸索橋?qū)W者們展開了細(xì)致的研究,包括其結(jié)構(gòu)特性、地震易損性等方面。但關(guān)于這一橋式仍存在一些內(nèi)容需要進(jìn)一步分析補(bǔ)充。塔梁分離式懸索橋的動力特性與抗震性能可能會受三方面因素影響:塔梁分離的邊界條件改變;吊跨比參數(shù)變化;地錨索設(shè)置。本文即以矮寨大橋?yàn)榛A(chǔ),研究以上三方面因素對結(jié)構(gòu)抗震性能的影響規(guī)律,以期為今后類似的工程方案提供思路。主要研究內(nèi)容包括:首先,介紹了懸索橋發(fā)展歷史趨勢與結(jié)構(gòu)分析理論,總結(jié)了結(jié)構(gòu)抗震分析的基本理論與懸索橋振動的有限元分析方法。著重闡述了其結(jié)構(gòu)靜力分析、動力分析、初始平衡狀態(tài)分析與有限元求解等方面,為建模分析作理論準(zhǔn)備。隨后,基于有限元分析軟件建立三組共九種不同結(jié)構(gòu)設(shè)置的懸索橋空間有限元模型并分別進(jìn)行模態(tài)分析與比較,通過總結(jié)各組模型的振動特性差異,得知地錨索設(shè)置等三方面因素對懸索橋動力特性的影響,也為后續(xù)的動力時程分析提供參考依據(jù)。最后,在理論與計算分析的基礎(chǔ)上確定大質(zhì)量,阻尼,地震波輸入,塑性鉸設(shè)置等相關(guān)時程分析條件后,分別對各模型進(jìn)行縱橋向與橫橋向、彈性與彈塑性動力時程分析。比較各模型的位移與內(nèi)力響應(yīng),以此獲得塔梁分離的邊界條件改變、吊跨比參數(shù)變化、地錨索設(shè)置三方面因素對懸索橋結(jié)構(gòu)抗震性能的影響的初步結(jié)論。
[Abstract]:Tower and beam separation suspension bridge is a new structure form of suspension bridge in recent years. In order to adapt to the mountain gorge topography, reduce the mountain excavation, make the structure compatible with the terrain environment, the main beam is supported on the mountain body instead of the main tower. As a result, the length of the main beam is smaller than the center distance of the main tower, and the cable arrangement changes accordingly, which results in the change of the structural mechanical properties compared with the conventional suspension bridge supported by the main tower to a certain extent. Hunan Western Hunan Paizhai Bridge is the first tower-beam suspension bridge built at home and abroad, but before this, there were few theories about the bridge structure. In recent years, researchers have carried out detailed studies on tower and beam separation suspension bridges, including their structural characteristics, seismic vulnerability and so on. However, there are still some contents about this bridge that need to be further analyzed and supplemented. The dynamic characteristics and seismic behavior of separated suspension bridges may be affected by three factors: the change of boundary conditions of tower and beam separation, the variation of the ratio of crane to span, and the installation of anchor cables. Based on the pai-zhai bridge, this paper studies the influence of the above three factors on the seismic performance of the structure in order to provide some ideas for similar projects in the future The main research contents are as follows: firstly, the development trend and structure analysis theory of suspension bridge are introduced, and the basic theory of seismic analysis and the finite element analysis method of suspension bridge vibration are summarized. The static analysis, the dynamic analysis, the initial equilibrium state analysis and the finite element solution of the structure are emphasized. The theoretical preparation for the modeling analysis is made. Then, based on the finite element analysis software, three groups of spatial finite element models of nine different structures of suspension bridges are established, and modal analysis and comparison are carried out respectively, and the differences of vibration characteristics of each group of models are summarized. The influence of three factors on the dynamic characteristics of the suspension bridge, such as the installation of the ground anchor cable, is known, which also provides a reference for the subsequent dynamic time history analysis. Finally, on the basis of theoretical and computational analysis, the related time-history analysis conditions such as large mass, damping, seismic wave input and plastic hinge setting are determined, and then the longitudinal and transverse bridge directions, elastic and elastoplastic dynamic time history analysis of each model are carried out respectively. By comparing the displacement and internal force responses of each model, the preliminary conclusions on the influence of three factors on the seismic behavior of suspension bridge structure are obtained, such as the change of boundary condition of tower and beam separation, the change of the ratio parameter of crane to span, and the setting of anchor cable on the suspension bridge structure.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U442.55;U448.25

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