粘滞阻尼器对中小跨径梁桥横向抗震性能影响

Effect of viscous damper on transverse seismic performance of medium and small span bridge

针对地震作用下中小跨径梁桥的震害特征,使用粘滞阻尼器作为横向限位装置来提升中小跨径梁桥的抗震性能.以一座常见的3 m×20 m混凝土连续梁桥为例,通过OpenSees软件来建立有限元模型,利用时程分析法分析了粘滞阻尼器对中小跨径梁桥横向抗震性能的影响.结果表明:粘滞阻尼器能够有效提升中小跨径梁桥的横向抗震性能;不同粘滞阻尼器参数对结构响应的影响很大,针对本文实例建议将阻尼指数设置为0.8,阻尼系数设置为3000 kN·s/m.

Aiming at the seismic damage characteristics of medium and small span bridge under earthquake action,a viscous damper was used as a transverse limit device to improve the seismic performance of medium and small span bridge.Taking a common continuous 3 m×20 m concrete beam bridge as example,a finite element model was established by using OpenSees software.The influence of viscous damper on the transverse seismic performance of medium and small span bridge was analyzed with the time-history analysis method.The results show that the viscous damper can effectively improve the transverse seismic performance of medium and small span bridge,and different parameters of viscous damper have great influence on the structure response.For the selected example,the damping index is set to 0.8,and the damping coefficient is set to 3000 kN·s/m.