应用MR阻尼器的连续梁桥地震损伤控制方法

基于地震作用下连续梁桥的损伤破坏机理,利用MR阻尼器控制元件,建立了基于桥墩广义水平刚度比的阻尼器出力方案,提出了连续梁桥的非线性地震损伤控制方法。对某一联三跨连续梁桥进行地震损伤控制研究,采用IDA(Increasing Dynamic Analysis)方法对控制前后桥梁结构进行损伤分析,结果表明所提出的控制方法可以有效降低桥梁损伤,并使桥墩损伤趋于均匀,显著提高桥梁的抗震性能;对采用不同控制方案和不同设计传递系数的桥梁进行地震损伤分析,结果表明半主动控制方案对墩梁残余位移和桥墩损伤的控制效果优于PON(Passive On)控制,并且设计传递系数对控制效果影响较大,需合理选用。

Seismic damage control method of continuous girder bridge with MR dampers

Based on the damage mechanism of continuous girder bridge under earthquake,the damper output scheme based on generalized horizontal stiffness ratio of pier was established by using MR damper control element,and the nonlinear seismic damage control method of continuous girder bridge was proposed.The damage control of a 3-span continuous girder bridge was studied,and the increasing dynamic analysis(IDA)method was used to do its damage analysis before and after the bridge was controlled by MR dampers.The results showed that the proposed control method can effectively reduce the bridge damage,make the bridge pier damage tend to be uniform,and significantly improve the aseismic performance of the bridge;seismic damage analyses of bridges with different control schemes and different design transfer coefficients reveal the semi-active control scheme is better than the PON(passive on)control scheme in controlling residual displacement of pier beam and pier damage;the design transfer coefficient has a larger influence on control effect,so it should be chosen reasonably.