橡胶防撞垫片参数对曲线桥力学特性的影响-《建筑科学与工程学报》

文章信息/Info

Title:: Influence of Parameters of Rubber Gasket on Mechanical Characteristic of Curved Bridge

Author(s):: SONG Bo, CHENG Jing-xia, WANG Yan-xu, BI Ze-feng; School of Civil and Environmental Engineering, University of Science and Technology Beijing

Keywords:: curved bridge; rubber gasket; mechanical characteristic; gap value; hardness

摘要:: 基于某两联曲线桥建立了计算模型，通过横桥向橡胶防撞垫片的设置，研究了橡胶垫片设计参数对曲线桥动力特性的影响。结果表明：橡胶垫片的加设使曲线桥旋转中心点转移，位移偏移方向改变；在设置橡胶垫片时，应考虑橡胶垫片的刚度以保证垫片作用力最大值不超过其极限值，避免梁体出现偏移；通过垫片的加设可以减弱梁体与挡块的碰撞，降低墩底曲率延性需求系数；随着间隙值的增大，橡胶垫片利用率明显下降，相对垫片的负荷增大，在保证曲线桥温度正常服役变形要求的前提下尽量减小间隙值的取值；随着硬度的增大，橡胶垫片强度增大，变形能力减弱，进而造成橡胶垫片利用率降低，建议选取邵氏硬度55作为橡胶垫片的首选值。

Abstract:: The calculation model was established based on a curved bridge with twolinking, and the influences of parameters of rubber gasket on mechanical characteristic of curved bridge were studied. The results show that application of rubber gasket make the rotation center of curved bridge transfer and the offset direction change. When rubber gasket is arranged, the stiffness of rubber gasket should be considered to ensure that the maximum force of gasket doesn’t exceed the limit value, and the deviation of beam body is avoided. The impact of beam body and block stop can be reduced by addition of gasket, and the curvature ductility demand coefficient of pier bottom can be reduced. The utilization rate of rubber gasket decreases obviously and the load of relative gasket increases with the increase of gap value. Under the premise of ensuring the normal service deformation requirements of temperature of curved bridge, the gap value should be reduced as far as possible. With the increase of hardness, the strength of rubber gasket increases, the deformation ability is weakened, and the utilization rate of rubber gasket is reduced. It is suggested that the Shore hardness value of 55 is taken as the first choice of rubber gasket.