支座类型对曲线梁桥抗震性能的影响分析

Effect of type on seismic performance of curved girder bridges

曲线梁桥在高等级公路及城市高架桥中应用广泛,但与直线梁桥相比,曲线梁桥在遭遇地震时更容易产生损坏、垮塌等严重后果。支座在曲线梁桥抗震中起着重要的作用。以潍坊至青岛高速公路景芝互通A匝道桥为依托,通过有限元分析计算板式橡胶支座、盆式支座和铅芯橡胶支座等不同支座类型对曲线梁桥抗震性能的影响,结果表明:铅芯橡胶支座的减隔震效果最好,板式橡胶支座在提高下部结构抗震安全性方面表现较好,但支座变形过大容易引起上部梁体滑移,与上部限位措施配套使用效果更好。

Curved girder bridge is widely used in expressway interchange and municipal bridge design,but it is more likely to collapse in earthquakes.Bearings play an important part in curved girder bridge.Based on the Weifang-Qingdao Expressway Jingzhi Interchange A Ramp Bridge,the effects of different bearing types such as plate rubber bearing,basin bearing and lead core rubber bearing on the seismic performance of curved girder bridge are calculated by finite element analysis.The results show that lead rubber bearing has the best performance in seismic reduction and isolation,plate rubber bearing can improve seismic performance of the superstructure,but can also lead to substructure slip due to its large deformation,it may be better used together with substructure limit devices.