曲线连续梁桥的磁流变阻尼器减震控制  

Seismic Mitigation Control for Curved Continuous Girder Bridge with Magnetorheological Dampers

作　　者：亓兴军[1] 吴玉华[2] 

机构地区：[1]山东建筑大学土木工程学院,山东济南250101 [2]浙江工业大学之江学院,浙江杭州310024

出　　处：《公路交通科技》2011年第9期81-88,共8页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(50908135);山东省交通科技计划项目(2009Y10)

摘　　要：建立双支承曲线连续梁桥的空间有限元模型和减震控制动力仿真模型,根据连续梁桥的支座布置在各活动支座的切向设置8组磁流变阻尼器,在纵桥向输入3种不同频谱特点的地震动,计算分析了曲线连续梁桥地震反应主动控制、半主动控制和被动控制方法的减震效果。结果表明,磁流变阻尼器能够有效地减小曲线梁桥的主梁切向位移和固定墩墩底的弯矩与扭矩。不同频谱特点地震动输入下磁流变阻尼器减震效果的差别较大,在设计曲线梁桥减震参数时需要合理选择地震动输入。总体上看,磁流变阻尼器主动控制、半主动控制和被动控制3种减震控制方法对于曲线连续梁桥大部分地震反应减震效果的差别较小,这可为简单易行的阻尼器耗能被动控制方法在曲线梁桥抗震减震设计中的广泛应用提供理论依据。The finite element model and seismic mitigation control dynamic simulation model were established for curved continuous bridge with double supports.According to the arrangement of bearings of continuous bridge,eight magnetorheological dampers were set in the tangent orientation at active bearings.Three ground motions with different spectra were input in the longitudinal direction of curved bridge.Seismic mitigation effectiveness of seismic active control,semi-active control and passive control for curved continuous bridge was calculated and analyzed.The results indicate that（1） Magnetorheological dampers can effectively reduce tangent displacement of girder,bend moment and torsional moment of fixed pier＇s bottom.（2） Seismic mitigation effectiveness of magnetorheological dampers has great difference under ground motions of different frequency spectra.When designing seismic parameters of curved girder bridge,the ground motion input should be correctly selected.The three seismic mitigation control methods of magnetorheological dampers have a little difference to most seismic mitigation effectiveness of curved girder bridge.This can offer theoretical evidence for aboard application of simple passive energy dissipation control of dampers in the seismic design of curved girder bridge.

关 键 词：桥梁工程 曲线连续梁桥 减震效果 磁流变阻尼器 地震动输入 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]