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Dynamic performance of cable-stayed bridge tower with multi-stage pendulum mass damper under wind excitations——I:Theory 被引量:4
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作者 郭安薪 徐幼麟 李惠 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2007年第3期295-306,共12页
In this paper, wind-induced vibration control of a single column tower of a cable-stayed bridge with a multi- stage pendulum mass damper (MSPMD) is investigated. Special attention is given to overcoming space limita... In this paper, wind-induced vibration control of a single column tower of a cable-stayed bridge with a multi- stage pendulum mass damper (MSPMD) is investigated. Special attention is given to overcoming space limitations for installing the control device in the tower and the effect of varying natural frequency of the towers during construction. First, the finite element model of the bridge during its construction and the basic equation of motion of the MSPMD are introduced. The equation of motion of the bridge with the MSPMD under along-wind excitation is then established. Finally, a numerical simulation and parametric study are conducted to assess the effectiveness of the control system for reducing the wind-induced vibration of the bridge towers during construction. The numerical simulation results show that the MSPMD is practical and effective for reducing the along-wind response of the single column tower, can be installed in a small area of the tower, and complies with the time-variant characteristics of the bridge during its entire construction stage. 展开更多
关键词 multi-stage pendulum mass damper cable-stayed bridge single column tower wind-induced vibration
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Dynamic performance of cable-stayed bridge tower with multi-stage pendulum mass damper under wind excitations—Ⅱ: Experiment 被引量:2
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作者 郭安薪 徐幼麟 李惠 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2007年第4期417-424,共8页
The possibility of using a multi-stage pendulum mass damper (MSPMD) to control wind-induced vibration of a single column tower of a cable-stayed bridge during construction was studied theoretically in part I of this... The possibility of using a multi-stage pendulum mass damper (MSPMD) to control wind-induced vibration of a single column tower of a cable-stayed bridge during construction was studied theoretically in part I of this work. In this paper, the performance of the MSPMD for reducing bridge tower vibration is studied experimentally. A MSPMD model and a tower model of the bridge with geometry scaling of 1:100 were designed and manufactured. Calibration of the MSPMD model with different wire lengths is conducted to verify the analytical model of the damper. A series of tests for the uncontrolled freestanding tower, tower with cables, and tower with MSPMD model are then performed under harmonic and white noise excitations. The experimental results show that the responses of the tower model significantly decrease with the installation of the MSPMD model, which demonstrates the effectiveness of the M SPMD to mitigate the vibration of the bridge tower. 展开更多
关键词 experimental study cable-stayed bridge single column tower multi-stage pendulum mass damper vibration control
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Shake table experimental study of cable-stayed bridges with two different design strategies of H-shaped towers
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作者 Xu Yan Cui Cunyu +1 位作者 Zeng Zeng Zeng Shijie 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2021年第2期483-493,共11页
As one of the main load-carrying components of cable-stayed bridges,bridge towers are typically required to remain elastic even when subjected to severe ground motions with a 2%-3%probability of exceedance in 50 years... As one of the main load-carrying components of cable-stayed bridges,bridge towers are typically required to remain elastic even when subjected to severe ground motions with a 2%-3%probability of exceedance in 50 years.To fulfill this special requirement imposed by current seismic design codes,reinforcement ratios in the bridge towers have to be kept significantly higher than if limited ductility behavior of the tower is allowed.In addition,since the foundation capacity is closely related to the moment and shear capacities of the bridge tower,a large increase in bridge construction cost for elastically designed cable-stayed bridge is inevitable.To further investigate the possibility of limited ductility bridge tower design strategies,a new 1/20-scale cable-stayed bridge model with H-shaped bridge towers designed according to strong strut-weak tower column design was tested.The shake table experimental results are compared with a previous strong tower column-weak strut designed full bridge model.A comparison of the results show that ductility design with plastic hinges located on tower columns,i.e.,strong strut-weak tower column design,is another effective seismic design strategy that results in only small residual displacement at the top of the tower column,even under very severe earthquake excitations. 展开更多
关键词 cable-stayed bridge shake table experiment limited ductility design H-shaped bridge tower seismic design
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General design of Sutong Bridge 被引量:4
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作者 Zhang Xigang Yuan Hong +2 位作者 Pei Minshan Dai Jie Xu Lin 《Engineering Sciences》 EI 2009年第1期6-11,共6页
The main span of Sutong Bridge is a double-pylon,double-plane cable-stayed bridge with steel box girder,which has the world's longest central span of 1 088 m within cable-stayed bridges.To overcome problems caused... The main span of Sutong Bridge is a double-pylon,double-plane cable-stayed bridge with steel box girder,which has the world's longest central span of 1 088 m within cable-stayed bridges.To overcome problems caused by severe meteorological conditions,perplexing hydrological conditions,deep buried bedrock and higher navigation level,many new technics and methods were created.Keys including structural system,steel box girder,stayed cable,tower,pier,tower foundation,collision avoidance system,wind-resistance,seismic-resistance,structural nonlinear response and structural static stability were presented individually in this paper. 展开更多
关键词 cable-stayed bridge structural system steel box girder stayed cable tower tower foundation
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Seismic design of high-rise towers for cable-stayed bridges under strong earthquakes
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作者 Yan XU Shide HU 《Frontiers of Structural and Civil Engineering》 SCIE EI 2011年第4期451-457,共7页
This paper presents the first of a series of studies on the seismic design of high-rise towers for cablestayed bridges under strong earthquakes.One practical cable-stayed bridge with a 730 m long main span and two hig... This paper presents the first of a series of studies on the seismic design of high-rise towers for cablestayed bridges under strong earthquakes.One practical cable-stayed bridge with a 730 m long main span and two high-rise towers over 200 m in height was selected for this study.The preliminary results show that compared with piers,the tower is more vulnerable to pulse-like earthquakes,and it may develop plasticity at certain locations.In addition,viscous dampers may not have the same effect during pulse-like earthquakes as they do under site-specific earthquakes.Hence,reoptimization of damper parameters or reconsideration of other energy dissipation devices will be needed if strong earthquakes are likely to occur. 展开更多
关键词 high-rise tower cable-stayed bridge strong earthquake seismic design
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