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Yuan W.-C.,Tongji University | Cao X.-J.,Tongji University | Rong Z.-J.,Jiangsu Wanbao Bridge Accessories Co.
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2010

A new aseismic bearing-cable-sliding friction aseismic bearing was developed. The polytetrafluoroethylene (PTFE) plate was used as a sliding friction device and the cable was used for limiting the displacement as well as providing a restoration force. Furthermore, the design parameters for the bearing were discussed. The friction coefficient between the stainless steel plate and PTFE plate along with hysteretic behavior under various vertical loads were tested by pseudo-static experiments, and the necessary parameters for creating a theoretical model of the bearing were obtained. The effectiveness of the bearing and the reasonable value of cable stiffness were analyzed in the presented example, which is a four-span continuous girder bridge. The result shows that the cable-sliding friction aseismic bearing can decrease the earthquake force of the fixed pier significantly. Moreover, the cable can limit the displacement efficiently and prevent the girder from falling.


Yuan W.,Tongji University | Wang B.,Tongji University | Cheung P.,Tongji University | Cao X.,Tongji University | Rong Z.,Jiangsu Wanbao Bridge Accessories Co.
Earthquake Engineering and Engineering Vibration | Year: 2012

During past strong earthquakes, highway bridges have sustained severe damage or even collapse due to excessive displacements and/or very large lateral forces. For commonly used isolation bearings with a pure friction sliding surface, seismic forces may be reduced but displacements are often unconstrained. In this paper, an alternative seismic bearing system, called the cable-sliding friction bearing system, is developed by integrating seismic isolation devices with displacement restrainers consisting of cables attached to the upper and lower plates of the bearing. Restoring forces are provided to limit the displacements of the sliding component. Design parameters including the length and stiffness of the cables, friction coefficient, strength of the shear bolt in a fixed-type bearing, and movements under earthquake excitations are discussed. Laboratory testing of a prototype bearing subjected to vertical loads and quasi-static cyclic lateral loads, and corresponding numerical finite element simulation analysis, were carried out. It is shown that the numerical simulation shows good agreement with the experimental force-displacement hysteretic response, indicating the viability of the new bearing system. In addition, practical application of this bearing system to a multi-span bridge in China and its design advantages are discussed. © 2012 Institute of Engineering Mechanics, China Earthquake Administration and Springer-Verlag Berlin Heidelberg.


Yuan W.,Tongji University | Wang B.,Jiangsu Wanbao Bridge Accessories Co. | Cao X.,Jiangsu Wanbao Bridge Accessories Co. | Cao X.,Tongji University | Rong Z.,Jiangsu Wanbao Bridge Accessories Co.
Journal of Earthquake Engineering and Engineering Vibration | Year: 2012

During past strong earthquakes, highway bridges have sustained severe damage or even collapse due to excessive displacements and/or very large lateral forces. For commonly used isolation bearings with a pure friction sliding surface, seismic forces may be reduced but displacements are often unconstrained. In this paper, an alternative seismic bearing system, called the cable-sliding friction bearing system, is developed by integrating seismic isolation devices with displacement restrainers consisting of cables attached to the upper and lower plates of the bearing. Restoring forces are provided to limit the displacements of the sliding component. Design parameters including the length and stiffness of the cables, friction coefficient, strength of the shear bolt in a fixed-type bearing, and movements under earthquake excitations are discussed. Laboratory testing of a prototype bearing subjected to vertical loads and quasi-static cyclic lateral loads, and corresponding numerical finite element simulation analysis, were carried out. It is shown that the numerical simulation shows good agreement with the experimental force-displacement hysteretic response, indicating the viability of the new bearing system. In addition, practical application of this bearing system to a multi-span bridge in China and its design advantages are discussed.

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