【摘要】：曲線梁橋不僅滿足道路整體線形的平順和連續(xù)性,而且能很好的克服地形和地物的制約,因此該種橋型在國內(nèi)外得到了廣泛的應用。但在近些年來多次大地震中,曲線梁橋依然有著較為嚴重的破壞,所以,研究不同參數(shù)下的大跨曲線梁橋在地震作用下的響應規(guī)律意義重大。本文以大跨徑曲線連續(xù)梁橋為研究對象,對其在不同參數(shù)下的地震響應規(guī)律進行研究,其內(nèi)容如下:(1)運用有限元分析軟件建立不同參數(shù)下大跨曲線連續(xù)梁橋的有限元分析模型,研究曲率半徑與樁土相互作用對橋梁結(jié)構(gòu)自振特性的影響以得到相應變化規(guī)律。(2)基于反應譜分析方法,分別從順橋向激勵和橫橋向激勵兩個方面考慮地震作用下橋梁位移、主梁內(nèi)力和橋墩內(nèi)力,以研究曲率半徑對大跨曲線連續(xù)梁橋地震響應的影響,得到不同曲率半徑下地震反應的變化規(guī)律。(3)選取曲率半徑為300m的大跨曲線連續(xù)梁橋,通過變化激勵的角度以研究激勵方向?qū)ζ涞卣痦憫挠绊?得出不同激勵方向下地震響應的變化規(guī)律。(4)基于動態(tài)時程分析方法,選擇曲率半徑為300m的橋梁,通過變化墩高和相對墩高差,以研究墩高和墩高差對大跨曲線連續(xù)梁橋地震反應的影響,得出不同等墩高和不同相對墩高差下的地震響應規(guī)律。根據(jù)數(shù)值分析得到的規(guī)律,針對于大跨曲線連續(xù)梁橋抗震設計時選定合理設計參數(shù)提出一些有益的建議。
[Abstract]:Curved girder bridge can not only satisfy the smooth and continuity of the whole road, but also overcome the constraints of terrain and features, so the bridge is widely used at home and abroad. However, in recent years, the curved girder bridges still have serious damage, so it is of great significance to study the response law of the long-span curved bridges under the earthquake action with different parameters. In this paper, the seismic response of long-span curved continuous beam bridge under different parameters is studied. The main contents are as follows: (1) the finite element analysis model of long-span curved continuous beam bridge with different parameters is established by using finite element analysis software. The influence of radius of curvature and pile-soil interaction on the natural vibration characteristics of bridge structure is studied in order to obtain the corresponding variation law. (2) based on the response spectrum analysis method, the bridge displacement under seismic action is considered from the two aspects of forward bridge excitation and transverse bridge excitation, respectively. In order to study the influence of curvature radius on seismic response of long-span curved continuous beam bridge, the variation law of seismic response under different curvature radii is obtained. (3) large span curved continuous beam bridge with curvature radius of 300 m is selected. By studying the influence of the direction of excitation on the seismic response, the variation law of seismic response under different excitation directions is obtained. (4) based on the dynamic time-history analysis method, a bridge with a curvature radius of 300 m is selected. By changing the pier height and the relative pier height difference, the influence of pier height and pier height difference on the seismic response of long-span curved continuous beam bridge is studied, and the seismic response law under different pier height and different relative pier height difference is obtained. According to the law obtained by numerical analysis, some useful suggestions are put forward for selecting reasonable design parameters in seismic design of long-span curved continuous beam bridges.
【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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