【摘要】：曲線梁橋能夠很好的適應路線線形,在城市高架,立體交通中較為常見。小曲率半徑曲線梁橋的應用越來越廣泛,但是曲線梁橋地震響應比較復雜,設計中存在著一系列問題,如樁土作用的影響,地震波最不利激勵方向的確定,減隔震的設計等等。本文以三跨30m+30m+30m的預應力混凝土連續(xù)曲線梁橋為工程實例背景,通過有限元程序Midas/civil建立模型進行深入分析,主要內容如下:(1)調查分析曲線梁橋在近些年來地震災害中發(fā)生破壞的特點;調查國內外曲線梁橋的研究現(xiàn)狀,對各國規(guī)范中關于曲線梁橋的抗震設計規(guī)定進行對比分析。(2)采用Midas/civil軟件對曲線梁橋進行建模及建模時考慮了支座預偏心的布置,了解曲線梁橋的動力特性,分析曲率半徑對自振特性的影響及曲線梁橋地震響應的特點;研究對于模型是否考慮樁-土作用進行對比研究。(3)根據(jù)08抗震細則,采用時程分析法對曲線梁橋進行減隔震研究。確定曲線梁橋最不利地震動輸入方向。(4)根據(jù)確定的最不利地震動方向,對曲線梁橋進行減隔震設計。分析采用鉛芯橡膠支座進行曲線梁橋的減震性能,研究曲線梁橋的減震性能提高程度。對鉛芯橡膠支座減震參數(shù)(如支座剛度,支座屈服力)進行分析。(5)介紹了常用的橋梁縱向防落梁裝置和橫向抗震擋塊。分析了地震中橫向抗震擋塊的影響及抗震擋塊和鉛芯橡膠支座共同考慮時的地震響應。
[Abstract]:Curved girder bridge can adapt to the line shape well, it is more common in urban elevated, three-dimensional traffic. The application of curved beam bridge with small curvature radius is more and more extensive, but the seismic response of curved beam bridge is more complex, there are a series of problems in the design, such as the effect of pile and soil, the determination of the most unfavorable excitation direction of seismic wave, the design of seismic isolation and so on. This paper takes the prestressed concrete continuous curved girder bridge with three spans 30m 30m as the engineering example, and establishes the model through the finite element program Midas/civil to carry on the thorough analysis. The main contents are as follows: (1) investigation and analysis of the damage characteristics of curved girder bridges in recent years, investigation of the current research situation of curved girder bridges at home and abroad, The aseismic design regulations of curved girder bridges in various countries are compared and analyzed. (2) the dynamic characteristics of curved girder bridges are understood by taking into account the pre-eccentricity arrangement of supports when modeling and modeling the curved girder bridges by using Midas/civil software. The influence of radius of curvature on the natural vibration characteristics and the characteristics of seismic response of curved beam bridges are analyzed, and a comparative study on whether the pile-soil interaction is considered in the model is studied. (3) according to the earthquake resistance rules of 08, the seismic isolation of curved girder bridges is studied by time-history analysis method. The input direction of the most unfavorable ground motion of curved girder bridge is determined. (4) according to the direction of the most unfavorable ground motion determined, the seismic isolation design of curved girder bridge is carried out. The vibration absorption performance of curved beam bridge with lead rubber bearing is analyzed, and the improvement degree of vibration absorption performance of curved beam bridge is studied. The vibration absorption parameters (such as bearing stiffness and bearing yield force) of lead rubber bearing are analyzed. (5) the common longitudinal anti-falling beam device and transverse seismic block of bridge are introduced. The influence of transverse seismic block and the seismic response of seismic block and lead rubber bearing are analyzed.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U442.55

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本文編號：2150716