桥梁减振技术的发展与应用

介绍了既有铁路桥梁因横向刚度不足及列车提速致使的横向振动、城市桥梁轨道交通车桥耦合动力振动、大跨度桥梁拉索的风雨激振、轴向流激振等几类桥梁振动减振技术的发展与应用.在铁路桥梁和高架桥梁中,对车桥耦合振动体系,采用被动控制法,安装质量阻尼器,改变桥梁基础结构的型式,进行桥梁减振和降噪.在斜拉桥拉索减振上,主要采用机械减振控制,安装目前较常用的粘性剪切型阻尼器进行减振,介绍了新型的磁流变阻尼器半主动控制法减振技术.这些减振措施在一些实际的桥梁减振中都取得了不错的效果.同时,还阐述了近年来在人行桥梁中新发现的人致桥梁侧向振动的桥梁减振新问题.

Development and application of bridge decreasing vibration technique

The development and application of bridge decreasing vibration technique,which consists of existing railway bridge transverse vibration due to the lack of transverse stiffness and the train speed increasing,urban bridge railway traffic vehicle-bridge coupled dynamic vibration,long-span bridge rainwind-induced vibration and axial flow vibration,is introduced in this paper.In order to decrease vibration and reduce noise,a passive control method is adopted and TMD(Tuned Mass Damper) is fixed,type of bridge foundation is modified in vehicle-bridge coupled dynamic system of railway bridge and urban bridge.In stay cable vibration control,a mechanical control method is applied and viscous shearing damper is fixed on the cables.Semi-active decreasing vibration control method adopting new magneto-rheological is also introduced.Obvious effects are gained with these decreasing vibration methods.Simultaneously,human-induced lateral vibration of pedestrian bridge is given,as a new problem of bridge decreasing vibration,which is researched in recent years.