【摘要】：斜交橋?qū)Φ匦魏铜h(huán)境有著較好的適應(yīng)性,因此在工程中廣泛應(yīng)用。在地震作用下斜交橋表現(xiàn)出了一定的易損性,且破壞機(jī)理較為復(fù)雜。特別是彎扭耦合作用、斜度影響、平面內(nèi)的爬行效應(yīng)等一系列因素的綜合作用。由于鉛芯橡膠支座具有良好的隔震和耗能能力,其被視為較理想的橋梁隔震裝置。本文建立簡(jiǎn)支斜交梁橋有限元計(jì)算模型,研究鉛芯橡膠支座對(duì)簡(jiǎn)支斜交梁橋的減震效果和地震響應(yīng)特性,主要研究結(jié)論如下：(1)鉛芯橡膠支座具有明顯的減震效果。與使用普通板式支座的橋梁相比,減震后斜交橋各墩墩底剪力及彎矩均得到了大幅度的減小,在鉛芯橡膠支座的減震作用下,地震內(nèi)力重新分配,各橋墩的受力趨于平衡。(2)在不同方向地震動(dòng)輸入工況下,通過(guò)對(duì)使用鉛芯橡膠支座的不同跨徑和斜度的斜交梁橋進(jìn)行一系列的地震響應(yīng)分析,與正交梁橋相比,斜交梁橋的空間耦聯(lián)性較強(qiáng),即當(dāng)有一個(gè)方向有內(nèi)力產(chǎn)生時(shí),其正交方向也伴隨著有內(nèi)力和扭矩的產(chǎn)生。(3)在不同方向的地震動(dòng)輸入下,各內(nèi)力表現(xiàn)出不同的變化趨勢(shì)。當(dāng)?shù)卣饎?dòng)沿X方向和Y方向單獨(dú)輸入時(shí),墩底剪力Fx和Fy基本不隨斜度變化。當(dāng)沿N方向輸入時(shí),隨著斜度的增加,墩底剪力Fx逐漸減小,Fy則逐漸增加;當(dāng)其沿T方向輸入時(shí),隨著斜度的增加,墩底剪力Fx隨之增加,而Fy隨之減小。當(dāng)?shù)卣饎?dòng)沿X和N方向輸入時(shí),彎矩My隨著橋梁斜度的增加而減��；當(dāng)?shù)卣饎?dòng)沿Y和T方向輸入時(shí),彎矩My隨著斜度的增加增大。墩底剪力Fx和Fy隨斜度的變化規(guī)律基本一致,不隨地震動(dòng)輸入方向的變化而變化。當(dāng)?shù)卣饎?dòng)沿XY和NT方向輸入時(shí),時(shí)程分析法所得墩底剪力均隨斜度的增加呈現(xiàn)先減小后增大的趨勢(shì)：隨著斜度的增加,墩底彎矩My均呈現(xiàn)減小的趨勢(shì)。(4)對(duì)于單跨簡(jiǎn)支斜交橋來(lái)說(shuō),墩底各內(nèi)力均隨著跨徑的增大呈增大趨勢(shì)。
[Abstract]:The oblique bridge has good adaptability to terrain and environment, so it is widely used in engineering. The oblique bridge is vulnerable to earthquake, and the failure mechanism is complicated. Especially, a series of factors, such as bending and torsional coupling, slope effect and creeping effect in plane, are combined. The lead rubber bearing is regarded as an ideal bridge isolation device because of its good isolation and energy dissipation capacity. In this paper, the finite element calculation model of simply supported skew beam bridge is established to study the vibration absorption effect and seismic response characteristics of the lead rubber bearing to the simply supported skew beam bridge. The main conclusions are as follows: (1) the lead rubber bearing has obvious seismic absorption effect. Compared with the bridge with ordinary plate bearing, the shear force and bending moment of the pier bottom of the skew bridge are greatly reduced after the earthquake absorption, and the internal force of the earthquake is redistributed under the action of the lead-rubber bearing. The force of each pier tends to balance. (2) under the input condition of ground motion in different directions, a series of seismic response analysis of skew beam bridge with different span and slope of lead rubber bearing is carried out, which is compared with that of orthogonal beam bridge. The spatial coupling of skew girder bridges is strong, that is, when there is an internal force in one direction, the orthogonal direction is accompanied by the generation of internal force and torque. (3) under the input of ground motion in different directions, the internal forces show different trends. When the local vibration is inputted separately along X and Y directions, the shear forces FX and Fy at the bottom of the pier basically do not change with the slope. When input along N direction, the shear force Fx of pier bottom decreases gradually with the increase of slope, and when input along the direction of T, the shear force Fx of pier bottom increases with the increase of slope, while Fy decreases. When the local vibration is input along the X and N directions, the bending moment my decreases with the increase of the bridge slope, and the moment my increases with the increase of the slope when the local vibration is input along the Y and T directions. The shear forces FX and Fy at the bottom of the pier are basically consistent with the variation of the slope and do not change with the change of the input direction of the vibration anywhere. When the local vibration is input along the direction of XY and NT, the shear force at the bottom of the pier obtained by the time-history analysis method decreases first and then increases with the increase of the slope: with the increase of the slope, (4) for single-span simply supported skew bridge, the internal forces at the bottom of pier increase with the increase of span.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U442.55

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