双曲面摩擦摆支座典型桥梁的地震响应研究

为研究不同因素对粤东高烈度地区双曲面摩擦摆支座高速公路典型桥梁工程地震响应的影响,选取潮安韩江特大桥主桥(55+4×90+55)m为研究对象,该桥所有墩梁之间均采用双曲面摩擦摆支座。采用ANSYS有限元软件建立全桥模型,基于时程分析法研究了多种因素下桥梁结构的地震响应。研究表明,在纵桥向地震动激励下,桩土的相互作用对各桥墩墩底地震响应影响显著;栓钉全部剪断比栓钉全部不剪断的各桥墩墩底弯矩和剪力分布更均匀,桥墩上的固定支座栓钉不剪断将会增加该桥墩的弯矩、剪力以及支座剪力,但对其他桥墩的影响较小;该研究成果可应用于带栓钉的摩擦摆支座桥梁的地震响应分析。

Study on seismic response of the typical bridge with hyperbolic surface friction pendulum bearings

In order to study the effect of different factors on seismic response of typical highway bridge with hyperbolic surface friction pendulum bearings in high earthquake intensity area of eastern Guangdong,Chao''an Hanjiang River Bridge with spans of (55+4×90+55) m was selected as the research object.The hyperbolic surface friction pendulum bearings were used in this bridge.The full bridge model was established by using the finite element software ANSYS,and the effect of different factors on seismic response of the bridge structure was studied by a time history analysis method.Research shows that:pile-soil interaction has a great influence on seismic response at each pier bottom under the longitudinal ground motion excitation;moment and shear force distribution at the bottom of each pier are more uniform when all studs are cut off than no studs cut.The fixed bearings studs of the pier are not cut,which will increase the shear of the bearing,shear force and moment of this pier.But there is only a small influence on other piers.This research result can be used in seismic response analysis of bridges with hyperbolic surface friction pendulum bearings including studs.