【摘要】：橋面連續(xù)簡支梁橋由于具有良好的地形適應(yīng)性、受力明確、施工方便、養(yǎng)護(hù)簡單等優(yōu)點,在我國山區(qū)高速公路中應(yīng)用廣泛。山區(qū)地形條件復(fù)雜,為了跨越高山峽谷,山區(qū)橋梁往往墩高較高且不同橋墩之間墩高相差較大,為典型的非規(guī)則橋梁,其地震響應(yīng)十分復(fù)雜。本文在前人研究的基礎(chǔ)上,針對非規(guī)則橋面連續(xù)簡支梁橋的縱橋向地震響應(yīng)進(jìn)行研究,主要研究內(nèi)容如下:(1)查閱文獻(xiàn)資料,總結(jié)橋面連續(xù)簡支梁橋地震反應(yīng)的研究現(xiàn)狀;根據(jù)我國簡支梁橋的常見震害,總結(jié)應(yīng)從震害中得到的啟示,指出中小跨徑梁式橋抗震概念設(shè)計的重要性及應(yīng)遵循的具體原則。(2)總結(jié)目前常用的橋梁結(jié)構(gòu)地震反應(yīng)分析方法;建立考慮支座滑動效應(yīng)、橋墩塑性、橋臺約束作用及聯(lián)與聯(lián)間碰撞作用的精細(xì)化有限元模型;確定中美兩國場地類型劃分的對應(yīng)關(guān)系并從PEER數(shù)據(jù)庫選取合適的強(qiáng)震記錄。(3)對橋面連續(xù)簡支梁橋及普通簡支梁橋進(jìn)行動力特性分析;采用增量動力分析法,對不同地震動加速度峰值下橋面連續(xù)簡支梁橋與普通簡支梁橋的縱橋向地震反應(yīng)進(jìn)行對比分析,研究總結(jié)非規(guī)則橋面連續(xù)簡支梁橋縱橋向地震反應(yīng)的特點。(4)總結(jié)梁式橋縱向碰撞的危害及研究現(xiàn)狀;研究地震動加速度峰值為0.4g時碰撞效應(yīng)對原工程背景橋梁縱橋向地震反應(yīng)的影響;在此基礎(chǔ)上,通過簡化模型,分別研究只考慮聯(lián)間碰撞及同時考慮聯(lián)間碰撞和主梁與橋臺之間的碰撞時鄰聯(lián)剛度比(0.3~1.0)對橋梁縱橋向碰撞效應(yīng)的影響。(5)總結(jié)梁式橋縱向限位措施的研究現(xiàn)狀,分析橋面連續(xù)簡支梁橋縱向限位的必要性;分別對拉索式連梁裝置的剛度和液體黏滯阻尼器的速度指數(shù)α、阻尼系數(shù)C對其限位性能及橋梁整體抗震性能的影響進(jìn)行參數(shù)分析。
[Abstract]:Continuous simple-supported bridge with bridge deck is widely used in mountainous expressway in China because of its advantages such as good terrain adaptability, clear stress, convenient construction, simple maintenance and so on. The terrain condition of mountain area is complex. In order to cross the mountain canyon, the pier height of mountain bridge is higher and the pier height difference between different piers is large. It is a typical irregular bridge, and its seismic response is very complex. On the basis of previous studies, this paper studies the longitudinal seismic response of continuous simply supported beam bridges with irregular decks. The main research contents are as follows: (1) referring to the literature and summarizing the present research situation of seismic response of continuous simply supported girder bridges on deck, the main research contents are as follows: (1) the seismic response of continuous simply supported girder bridges with irregular decks is studied. According to the common earthquake damage of simply supported girder bridge in our country, the enlightenment that should be gained from the earthquake disaster is summarized. This paper points out the importance of seismic conceptual design of small and medium span girder bridges and the specific principles to be followed. (2) summarize the commonly used seismic response analysis methods of bridge structures at present; A fine finite element model considering sliding effect of support, pier plasticity, abutment constraint and collision between abutment and abutment is established. The corresponding relationship of site classification between China and the United States is determined and appropriate strong earthquake records are selected from PEER database. (3) the dynamic characteristics of continuous simply supported bridge and ordinary simply supported beam bridge are analyzed. By means of incremental dynamic analysis method, the seismic response of bridge deck continuous simply supported girder bridge with ordinary simply supported beam bridge under different peak acceleration of ground motion is compared with that of ordinary simple supported beam bridge in the direction of longitudinal seismic response. The characteristics of longitudinal seismic response of continuous simply supported beam bridges with irregular deck are summarized. (4) the harm and research status of longitudinal collision of beam bridges are summarized. The impact of the impact effect on the longitudinal seismic response of the bridge in the original engineering background is studied when the acceleration peak of the ground motion is 0.4g. On this basis, by simplifying the model, The influence of the adjacent stiffness ratio (0.3? 1. 0) on the longitudinal impact effect of the bridge is studied when only the inter-connection collision is considered and the impact between the main beam and the abutment is considered at the same time. (5) the longitudinal limit effect of the beam-type bridge is summarized. The status of research on measures, The necessity of longitudinal limit of continuous simply supported girder bridge on deck is analyzed. The effects of stiffness, velocity index 偽 and damping coefficient C on the limit performance and the overall seismic performance of the bridge are analyzed respectively with respect to the stiffness of the cable connecting beam device and the velocity index 偽 and the damping coefficient C of the liquid viscous damper.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U442.55

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