使用铅芯橡胶支座的斜交梁桥地震响应特性分析
发布时间：2018-08-09 14:50
【摘要】：斜交桥对地形和环境有着较好的适应性,因此在工程中广泛应用。在地震作用下斜交桥表现出了一定的易损性,且破坏机理较为复杂。特别是弯扭耦合作用、斜度影响、平面内的爬行效应等一系列因素的综合作用。由于铅芯橡胶支座具有良好的隔震和耗能能力,其被视为较理想的桥梁隔震装置。本文建立简支斜交梁桥有限元计算模型,研究铅芯橡胶支座对简支斜交梁桥的减震效果和地震响应特性,主要研究结论如下：(1)铅芯橡胶支座具有明显的减震效果。与使用普通板式支座的桥梁相比,减震后斜交桥各墩墩底剪力及弯矩均得到了大幅度的减小,在铅芯橡胶支座的减震作用下,地震内力重新分配,各桥墩的受力趋于平衡。(2)在不同方向地震动输入工况下,通过对使用铅芯橡胶支座的不同跨径和斜度的斜交梁桥进行一系列的地震响应分析,与正交梁桥相比,斜交梁桥的空间耦联性较强,即当有一个方向有内力产生时,其正交方向也伴随着有内力和扭矩的产生。(3)在不同方向的地震动输入下,各内力表现出不同的变化趋势。当地震动沿X方向和Y方向单独输入时,墩底剪力Fx和Fy基本不随斜度变化。当沿N方向输入时,随着斜度的增加,墩底剪力Fx逐渐减小,Fy则逐渐增加;当其沿T方向输入时,随着斜度的增加,墩底剪力Fx随之增加,而Fy随之减小。当地震动沿X和N方向输入时,弯矩My随着桥梁斜度的增加而减小；当地震动沿Y和T方向输入时,弯矩My随着斜度的增加增大。墩底剪力Fx和Fy随斜度的变化规律基本一致,不随地震动输入方向的变化而变化。当地震动沿XY和NT方向输入时,时程分析法所得墩底剪力均随斜度的增加呈现先减小后增大的趋势：随着斜度的增加,墩底弯矩My均呈现减小的趋势。(4)对于单跨简支斜交桥来说,墩底各内力均随着跨径的增大呈增大趋势。
[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.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55
本文编号：2174433
[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.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55
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