本文關(guān)鍵詞：連續(xù)剛構(gòu)橋抗震性能分析研究　出處：《重慶交通大學》2014年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 連續(xù)剛構(gòu)橋 靜力動力特性 抗震性能 地震作用 地震響應(yīng)分析

【摘要】：隨著我國交通事業(yè)的快速發(fā)展，越來越多的連續(xù)剛構(gòu)橋被廣泛的應(yīng)用到實際工程之中，特別是在地形復雜的西南和西北地區(qū)，高墩大跨度的連續(xù)剛構(gòu)橋在經(jīng)濟、適用、安全和美觀四個方面都體現(xiàn)出巨大的優(yōu)勢。加上近些年來，世界范圍內(nèi)頻繁發(fā)生的地震，把這一自然界最嚴重的災(zāi)害重新帶進了人們的視線，同時由于西南和西北地區(qū)地震活動頻繁，對連續(xù)剛構(gòu)橋的地震反應(yīng)分析顯得更加重要。 橋梁作為交通線路上的樞紐工程，在抗震要求上與其他建筑物有所不同。對橋梁抗震性能的要求，首先是要在地震災(zāi)后能保持交通線路的暢通，以方便災(zāi)后救援和重建工作的開展；其次由于橋梁造價高，維修困難且昂貴，盡量減小其在地震反應(yīng)中受到的損傷，也是很必要的。 本文首先介紹了曲線連續(xù)剛構(gòu)橋及其結(jié)構(gòu)特點，簡要闡述了橋梁震害及高墩大跨曲線連續(xù)剛構(gòu)橋的抗震研究現(xiàn)狀；接著簡單介紹了目前橋梁地震響應(yīng)分析的基本理論，重點闡述了廣泛應(yīng)用的反應(yīng)譜法和動力時程分析法；進而以某大橋為工程背景，建立了空間有限元力學模型，分析研究了高墩大跨曲線連續(xù)剛構(gòu)橋的靜動力特性，主要包括結(jié)構(gòu)自振特性分析和結(jié)構(gòu)在縱橋向、橫橋向及豎橋向三個方向地震作用下的響應(yīng)分析。建立了結(jié)構(gòu)的多個變參數(shù)模型，分析了樁-土結(jié)構(gòu)相互作用對高墩大跨曲線連續(xù)剛構(gòu)橋地震響應(yīng)內(nèi)力和位移的不同影響，研究總結(jié)了樁-土結(jié)構(gòu)相互作用對該橋抗震性能的影響規(guī)律，提出了一些設(shè)計建議。分析了研究對象在考慮行波效應(yīng)時的地震響應(yīng)特點，并與一致激勵時的計算結(jié)果進行了對比分析，研究總結(jié)了行波效應(yīng)對該橋抗震性能的影響規(guī)律，重點研究了不同邊界條件、不同曲率半徑以及不同地震激勵方向?qū)Ω叨沾罂缜�連續(xù)剛構(gòu)橋地震響應(yīng)的影響，得出有益結(jié)論，地震作用下，連續(xù)剛構(gòu)橋橋墩的墩頂和墩底是危險截面，跨中截面縱向位移較大，，高階陣型在連續(xù)剛構(gòu)橋抗震分析中起著控制作用等結(jié)論，為同類橋梁的抗震設(shè)計與研究提供相應(yīng)參考。
[Abstract]:With the rapid development of transportation in China, more and more continuous rigid frame bridges have been widely used in practical projects, especially in the southwest and northwest areas with complex terrain, and the high-pier and large-span continuous rigid frame bridges are in the economy. In recent years, the frequent earthquakes around the world have brought back the most serious disaster in nature. At the same time, seismic response analysis of continuous rigid frame bridges is more important because of frequent seismic activities in southwest and northwest regions. As the hub of traffic lines, bridges are different from other buildings in seismic requirements. The first requirement for seismic performance of bridges is to maintain the smooth flow of traffic lines after earthquake disasters. To facilitate post-disaster relief and reconstruction efforts; Secondly, because of its high cost, difficult and expensive maintenance, it is necessary to minimize the damage caused by the bridge in earthquake response. This paper first introduces the curved continuous rigid frame bridge and its structural characteristics, and briefly describes the earthquake damage of the bridge and the seismic research status of the long span curved continuous rigid frame bridge with high piers. Secondly, the basic theory of bridge seismic response analysis is briefly introduced, and the widely used response spectrum method and dynamic time-history analysis method are emphasized. Then taking a certain bridge as the engineering background, the spatial finite element mechanical model is established, and the static and dynamic characteristics of the long-span curved continuous rigid frame bridge with high piers are analyzed and studied, including the analysis of the natural vibration characteristics of the structure and the analysis of the structure in the longitudinal direction of the bridge. The response analysis of transverse bridge and vertical bridge under seismic action is carried out. Several variable parameter models of the structure are established. The influence of pile-soil structure interaction on seismic response internal force and displacement of long-span continuous rigid frame bridge with high piers is analyzed, and the influence of pile-soil structure interaction on seismic performance of the bridge is summarized. Some design suggestions are put forward. The characteristics of seismic response of the research object considering traveling wave effect are analyzed and compared with the calculated results under consistent excitation. The influence of traveling wave effect on seismic performance of the bridge is summarized, and the effects of different boundary conditions, different curvature radius and different direction of earthquake excitation on the seismic response of long-span continuous rigid frame bridge with high piers are studied. The conclusion is that the pier top and bottom of the pier of continuous rigid frame bridge are dangerous section, the longitudinal displacement of the middle section of span is large, and the high order matrix plays a controlling role in seismic analysis of continuous rigid frame bridge. It provides a reference for the seismic design and research of similar bridges.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U442.55;U448.23

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