【摘要】：斜交橋對地形和環(huán)境有著較好的適應性,因此在工程中廣泛應用。在地震作用下斜交橋表現(xiàn)出了一定的易損性,且破壞機理較為復雜。特別是彎扭耦合作用、斜度影響、平面內的爬行效應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。本文建立簡支斜交梁橋有限元計算模型,研究鉛芯橡膠支座對簡支斜交梁橋的減震效果和地震響應特性,主要研究結論如下：(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,地震內力重新分配,各橋墩的受力趨于平衡。(2)在不同方向地震動輸入工況下,通過對使用鉛芯橡膠支座的不同跨徑和斜度的斜交梁橋進行一系列的地震響應分析,與正交梁橋相比,斜交梁橋的空間耦聯(lián)性較強,即當有一個方向有內力產生時,其正交方向也伴隨著有內力和扭矩的產生。(3)在不同方向的地震動輸入下,各內力表現(xiàn)出不同的變化趨勢。當?shù)卣饎友豖方向和Y方向單獨輸入時,墩底剪力Fx和Fy基本不隨斜度變化。當沿N方向輸入時,隨著斜度的增加,墩底剪力Fx逐漸減小,Fy則逐漸增加;當其沿T方向輸入時,隨著斜度的增加,墩底剪力Fx隨之增加,而Fy隨之減小。當?shù)卣饎友豖和N方向輸入時,彎矩My隨著橋梁斜度的增加而減��；當?shù)卣饎友豗和T方向輸入時,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,不隨地震動輸入方向的變化而變化。當?shù)卣饎友豖Y和NT方向輸入時,時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：隨著斜度的增加,墩底彎矩My均呈現(xiàn)減小的趨勢。(4)對于單跨簡支斜交橋來說,墩底各內力均隨著跨徑的增大呈增大趨勢。
[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.
【學位授予單位】：山東建筑大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U442.55

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