Simplified Calculation Method for Supplemental Viscous Dampers of Cable-Stayed Bridges under Near-Fault Ground Motions

ABSTRACT

Viscous dampers are usually installed between the tower and girder to restrain the girder’s longitudinal displacement of cable-stayed bridges. Yet the appropriate damper design has to be determined through repetitive numerical analysis in the current practice. To streamline this process, analytical formulas were derived with a proposed 3 degree of freedom simplified model based on equivalent damping ratio and linearization of nonlinear viscous dampers, for achieving the damping coefficient of nonlinear viscous dampers of the cable-stayed bridge under near-fault ground motions, and the accuracy is verified by numerical analysis of a real cable-stayed bridge model.

KEYWORDS:

• Viscous Damper
• Velocity Pulse
• Near-Fault Ground Motion
• Cable-Stayed Bridge
• Equivalent Damping Ratio
• Equivalent Linearization

Additional information

Funding

This work was supported by the the National Natural Science Foundation of China [No. 51478338];the National Key Research and Development Plan of China [2017YFC1500700];