新建津石高速公路与既有铁路线路交汇,采用2×65 m T形刚构大节段现浇转体上跨既有铁路。考虑桥墩下部承台桩基距离既有铁路较近,通过施作防护桩、拉森钢板桩、回灌井及调整施工顺序等手段最大限度的减小对既有铁路的影响;采用水泥...新建津石高速公路与既有铁路线路交汇,采用2×65 m T形刚构大节段现浇转体上跨既有铁路。考虑桥墩下部承台桩基距离既有铁路较近,通过施作防护桩、拉森钢板桩、回灌井及调整施工顺序等手段最大限度的减小对既有铁路的影响;采用水泥搅拌桩加固地基,满足现浇梁支架地基承载要求;转体施工加强防护与监测。采用PLAXIS完成相关模拟运算,顺利完成上跨铁路转体施工,对后续类似工程有较大的参考价值。展开更多
Active control technology has been investigated and applied in numerous building structures and infrastructures since 1972 when it was firstly introduced into the civil engineering field by Professor JTP Yao.Now,half ...Active control technology has been investigated and applied in numerous building structures and infrastructures since 1972 when it was firstly introduced into the civil engineering field by Professor JTP Yao.Now,half a century has passed,a variety of control systems have been invented and implemented by researchers and engineers from all over the world.The recent years have witnessed remarkable research attempts and progress devoted to the development in this area based on modern control theory.However,there are still some unknown areas which are worthy of being explored in depth.One of such examples is the application of tuned mass dampers(TMD)to the flutter vibration control of long span bridges.Although applications of TMDs to bridges have been sighted in practice,their genuine effectiveness remains a serious question.The issues relating to how the coupled effect of TMD’s linear force being restricted by the rotational velocity of bridge’s deck during wind excitations which may eventually leads to flutter vibrations,remains unanswered.Such unusual phenomena and limitations were initially discovered and reported by the author sixteen years ago when investigating the barge ship crane hook’s swing motion control.In recent years,the author has invented the active rotary inertia driver(ARID)system which now has been granted patents in China,the US,Europe(including the UK,France,and Germany),Russia,Brazil,India,South Africa,Canada,Australia,Japan and Korean,etc.The ARID is an active control system which could exert direct control torque or moment to the target structures with rotational motions or vibrations natures,including and not limited to buildings,bridges or offshore platforms subjected to winds,earthquakes,and waves excitations.Furthermore,the ARID control system and its methodology can also be applicable to various mechanical systems including but not limited to cranes,vehicles,trains,ships,aircrafts,space crafts,satellites,and robotics.In this paper,the theory,modelling,comprehensive parametric analysis and case study of the ARID system for flutter vibration control of bridges will be discussed,as well as its promising applications in other various occasions.展开更多
文摘新建津石高速公路与既有铁路线路交汇,采用2×65 m T形刚构大节段现浇转体上跨既有铁路。考虑桥墩下部承台桩基距离既有铁路较近,通过施作防护桩、拉森钢板桩、回灌井及调整施工顺序等手段最大限度的减小对既有铁路的影响;采用水泥搅拌桩加固地基,满足现浇梁支架地基承载要求;转体施工加强防护与监测。采用PLAXIS完成相关模拟运算,顺利完成上跨铁路转体施工,对后续类似工程有较大的参考价值。
基金supported by the Ministry of Science and Technology of China (Grant No.2019YFE0112400)the Department of Science and Technology of Shandong Province (Grant No.2021CXGC011204)Liaoning Provincial Key Laboratory of Safety and Protection for Infrastructure Engineering。
文摘Active control technology has been investigated and applied in numerous building structures and infrastructures since 1972 when it was firstly introduced into the civil engineering field by Professor JTP Yao.Now,half a century has passed,a variety of control systems have been invented and implemented by researchers and engineers from all over the world.The recent years have witnessed remarkable research attempts and progress devoted to the development in this area based on modern control theory.However,there are still some unknown areas which are worthy of being explored in depth.One of such examples is the application of tuned mass dampers(TMD)to the flutter vibration control of long span bridges.Although applications of TMDs to bridges have been sighted in practice,their genuine effectiveness remains a serious question.The issues relating to how the coupled effect of TMD’s linear force being restricted by the rotational velocity of bridge’s deck during wind excitations which may eventually leads to flutter vibrations,remains unanswered.Such unusual phenomena and limitations were initially discovered and reported by the author sixteen years ago when investigating the barge ship crane hook’s swing motion control.In recent years,the author has invented the active rotary inertia driver(ARID)system which now has been granted patents in China,the US,Europe(including the UK,France,and Germany),Russia,Brazil,India,South Africa,Canada,Australia,Japan and Korean,etc.The ARID is an active control system which could exert direct control torque or moment to the target structures with rotational motions or vibrations natures,including and not limited to buildings,bridges or offshore platforms subjected to winds,earthquakes,and waves excitations.Furthermore,the ARID control system and its methodology can also be applicable to various mechanical systems including but not limited to cranes,vehicles,trains,ships,aircrafts,space crafts,satellites,and robotics.In this paper,the theory,modelling,comprehensive parametric analysis and case study of the ARID system for flutter vibration control of bridges will be discussed,as well as its promising applications in other various occasions.
