This study focuses on the longitudinal restraint system that can enhance the static and dynamic mechanical properties of the long-span cable-stayed bridges in the high intensity areas.The Anluo H uanghe River Bridge,a long-span cable-stayed bridge in a high intensity area,is used as a case.It is suggested to add a longitudinal multifunctional dynamic energy dissipation device in-between the pylon and the girder(which is called a multifunctional dynamic energy dissipation system),to collaborate with the fundamental semi-floating system and the elastic restraint system in a cable-stayed bridge.The key parameters of the multifunctional dynamic energy dissipation device are determined and compared with the performance of the conventional semi-floating system and longitudinal elastic system.As per the analysis,a cable-stayed bridge in the high intensity area,which is only fitted with elastic restraints,shows insufficient static and dynamic capacities.After fitted with a multifunctional dynamic energy dissipation system,the thermal deformation of the main girder will not impact the pylons,the multifunctional dynamic energy dissipation system works as an extra elastic restraint to the bridge under static loads and load combinations,and mitigates vibration and dissipates energy in a seismic event,as a result,the longitudinal static and dynamic capacities of the long-span cable-stayed bridge are effectively improved.
关键词
斜拉桥/约束体系/多功能动力耗能装置/静力响应/动力响应/有限元法
Key words
cable-stayed bridge/restraint system/multifunctional dynamic energy dissipation device/static response/dynamic response/finite element method
维普
万方数据