This paper focuses on understanding and evaluating the dynamic effect of the heavy-haul train system on the seismic performance of a long-span railway bridge. A systematic study on the effect of heavy-haul trains on b...This paper focuses on understanding and evaluating the dynamic effect of the heavy-haul train system on the seismic performance of a long-span railway bridge. A systematic study on the effect of heavy-haul trains on bridge seismic response has been conducted, considering the influence of vehicle modeling strategies and dynamic characteristics of the seismic waves. For this purpose, the performance of a long-span cable-stayed railway bridge is assessed with stationary trains atop it, where the heavy-haul vehicles are modeled in two different ways: the multi-rigid body model with suspension system and additional mass model. Comparison of the bridge response in the presence or absence of the train system has been conducted, and the vehicle loading situation, which includes full-load and no-load, is also discussed. The result shows that during the earthquake, the peak moment of the main girder and peak stress of stay cables increase by 80% and by 40% in the presence of fully loaded heavy-haul trains, respectively. At the same time, a considerable decrease appears in the peak acceleration of the main girder. This proves the existence of the damping effect of the heavy-haul train system, and this effect is more obvious for the fully loaded vehicles. Finally, this paper proposes an efficient vehicle modeling method with 2 degrees of freedom(DOF) for simplifying the treatment of the train system in bridge seismic checking.展开更多
How can we make it possible for instructors and students from different countries and regions to meet"face-to-face"and experience live teaching and learning?The most economic and efficient solution is the&qu...How can we make it possible for instructors and students from different countries and regions to meet"face-to-face"and experience live teaching and learning?The most economic and efficient solution is the"live global classroom".This paper provides an example of the live global classroom approach conducted cooperatively by the American Alliance for International Education and the University of Science and Technology Beijing,which was aimed at educating undergraduate engineering students over the Internet.In this paper,we introduce the background for the live global classroom,the demands of the"Plan for Educating and Training Outstanding Engineers"in China,the operational model,the technical requirements for the project and its current organizational challenges.Internationalized e-learning is expected to lead the trend of remote teaching,not only in language learning but also in engineer educating in China.展开更多
基金Project(51678576) supported by the National Natural Science Foundation of ChinaProject(2017YFB1201204) supported by the National Key R&D Program of China。
文摘This paper focuses on understanding and evaluating the dynamic effect of the heavy-haul train system on the seismic performance of a long-span railway bridge. A systematic study on the effect of heavy-haul trains on bridge seismic response has been conducted, considering the influence of vehicle modeling strategies and dynamic characteristics of the seismic waves. For this purpose, the performance of a long-span cable-stayed railway bridge is assessed with stationary trains atop it, where the heavy-haul vehicles are modeled in two different ways: the multi-rigid body model with suspension system and additional mass model. Comparison of the bridge response in the presence or absence of the train system has been conducted, and the vehicle loading situation, which includes full-load and no-load, is also discussed. The result shows that during the earthquake, the peak moment of the main girder and peak stress of stay cables increase by 80% and by 40% in the presence of fully loaded heavy-haul trains, respectively. At the same time, a considerable decrease appears in the peak acceleration of the main girder. This proves the existence of the damping effect of the heavy-haul train system, and this effect is more obvious for the fully loaded vehicles. Finally, this paper proposes an efficient vehicle modeling method with 2 degrees of freedom(DOF) for simplifying the treatment of the train system in bridge seismic checking.
文摘How can we make it possible for instructors and students from different countries and regions to meet"face-to-face"and experience live teaching and learning?The most economic and efficient solution is the"live global classroom".This paper provides an example of the live global classroom approach conducted cooperatively by the American Alliance for International Education and the University of Science and Technology Beijing,which was aimed at educating undergraduate engineering students over the Internet.In this paper,we introduce the background for the live global classroom,the demands of the"Plan for Educating and Training Outstanding Engineers"in China,the operational model,the technical requirements for the project and its current organizational challenges.Internationalized e-learning is expected to lead the trend of remote teaching,not only in language learning but also in engineer educating in China.
