本文選題：簡支斜交橋 + 精細(xì)化模型��； 參考：《石家莊鐵道大學(xué)》2015年碩士論文

【摘要】：斜交橋的地震反應(yīng)與正交橋相比具有特殊性和復(fù)雜性,并且斜交橋在歷次大地震中遭到了嚴(yán)重破壞。本文采用OpenSees軟件建立考慮碰撞過程中摩擦作用的簡支斜交橋精細(xì)化三維點(diǎn)—面碰撞模型,并分析了水平地震動(dòng)輸入方向、斜度、豎向地震動(dòng)等參數(shù)對(duì)簡支斜交橋地震碰撞反應(yīng)的影響。本文主要內(nèi)容如下:(1)通過查閱國內(nèi)外相關(guān)文獻(xiàn),對(duì)斜交橋的震害、地震碰撞等相關(guān)問題進(jìn)行了系統(tǒng)回顧和總結(jié),詳細(xì)介紹了斜交橋上部結(jié)構(gòu)建模方法和主要碰撞模型。(2)對(duì)本文提出的簡支斜交橋點(diǎn)—面碰撞模型進(jìn)行可靠性驗(yàn)證,并論證其能夠精細(xì)化模擬地震反應(yīng)的特點(diǎn),結(jié)果表明:梁端最大碰撞力的產(chǎn)生位置隨著斜度的變化而改變;梁端與橋臺(tái)間的摩擦作用削弱了斜度對(duì)梁端銳角處縱向最大位移的影響;不考慮摩擦作用會(huì)高估上部結(jié)構(gòu)峰值轉(zhuǎn)角。(3)分析了水平地震動(dòng)輸入方向?qū)喼苯粯虻卣鹋鲎卜磻?yīng)的影響,發(fā)現(xiàn):僅考慮梁體與橋臺(tái)間的縱向碰撞效應(yīng)時(shí),斜度為?的簡支斜交橋的梁端縱向最大位移和上部結(jié)構(gòu)峰值轉(zhuǎn)角最小值出現(xiàn)在地震動(dòng)輸入角度??(90???)左右處;考慮梁體與橋臺(tái)和橫向擋塊間的縱、橫向聯(lián)合碰撞效應(yīng)時(shí),地震碰撞反應(yīng)變得更加復(fù)雜,并且斜度越大,復(fù)雜程度越高。(4)研究了考慮水平地震動(dòng)輸入方向時(shí)斜度對(duì)簡支斜交橋地震碰撞反應(yīng)的影響,結(jié)果表明:僅考慮梁體與橋臺(tái)間的縱向碰撞效應(yīng)時(shí),梁端縱向最大位移和上部結(jié)構(gòu)峰值轉(zhuǎn)角隨斜度增大而增大;考慮梁體與橋臺(tái)和橫向擋塊間的縱、橫向聯(lián)合碰撞效應(yīng)時(shí),梁端縱向最大位移隨斜度增大而增大,峰值轉(zhuǎn)角隨斜度增大呈先增大后減小的趨勢。(5)對(duì)豎向地震動(dòng)在簡支斜交橋地震反應(yīng)中的作用進(jìn)行了分析探討,發(fā)現(xiàn)豎向地震動(dòng)對(duì)支座上拔力和考慮支座滑移時(shí)的地震碰撞反應(yīng)均有一定影響。
[Abstract]:Compared with the orthogonal bridge, the seismic response of the skew bridge is special and complex, and the skew bridge has been seriously damaged in the past major earthquakes. In this paper, OpenSees software is used to establish a fine three-dimensional point-plane collision model of a simply supported skew bridge considering the friction action during the collision process, and the input direction and slope of horizontal ground motion are analyzed. Effect of vertical ground motion and other parameters on seismic collision response of simply supported skew bridge. The main contents of this paper are as follows: (1) by consulting the relevant literature at home and abroad, the paper systematically reviews and summarizes the earthquake damage, earthquake collision and other related problems of the oblique bridge. This paper introduces the method of superstructure modeling and the main impact model of skew bridge in detail. It verifies the reliability of the point-plane collision model of simply supported skew bridge, and proves that it can simulate the seismic response finely. The results show that the position of the maximum impact force at the end of the beam changes with the change of the slope, and the friction between the end of the beam and the abutment weakens the influence of the slope on the longitudinal maximum displacement at the sharp angle of the beam end. The influence of the input direction of horizontal ground motion on the seismic collision response of simply supported skew bridge is analyzed. It is found that when only the longitudinal collision effect between beam body and abutment is considered, the slope is? The maximum longitudinal displacement at the beam end and the minimum peak rotation angle of the superstructure of the simply supported skew bridge appear at the input angle of ground motion On the left and right, the seismic collision response becomes more complicated when the longitudinal and transverse collision effect between the beam body and the abutment and the transverse block is considered, and the larger the slope is, The effect of slope on seismic collision response of simply supported skew bridge is studied when the input direction of horizontal ground motion is considered. The results show that only the longitudinal collision effect between beam body and abutment is considered. The maximum longitudinal displacement at the end of the beam and the peak angle of the superstructure increase with the increase of the slope, and the maximum longitudinal displacement of the end of the beam increases with the increase of the slope when the longitudinal and transverse collision effect between the beam body and the abutment and the transverse block is considered. The effect of vertical ground motion on the seismic response of simply supported skew bridges is analyzed and discussed. It is found that the vertical ground motion has some influence on the uplift force and the seismic collision response when bearing slip is considered.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442.55

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

1 劉鵬;地震作用下橋梁梁體與橫向擋塊動(dòng)態(tài)碰撞研究[D];西南交通大學(xué);2011年

，

本文編號(hào)：1936871