Year-end Sale % OFF 
Abstract
Restrained transversal tower/pier–girder connections of cable-stayed bridges may lead to high seismic demands for tower columns when subject to earthquake excitations; however, free transversal tower/pier–girder connections may cause large relative displacement. Using an energy dissipation system can effectively control the bending moment of tower columns and the relative tower/pier-girder displacement simultaneously, but repeated time history analyses are needed to determine reasonable design parameters, such as yield strength. In order to improve design efficiency, a practical design method is demanded. Therefore, the influence of yielding strength at different locations is studied by using comprehensive and parametric time history analyses at first. The results indicate that yielding steel dampers can significantly reduce the bending moment at tower columns and the relative pier–girder displacement due to the system switch mechanism during the vibration. Meanwhile, the yielding steel damper shows its general effect on reducing relative displacement between all piers/tower columns and the main girder as well, with only a localized effect on controlling seismic induced forces. Furthermore, a practical design method is proposed for engineering practices to determine key parameters of the yielding steel damper.
Highlights
IntroductionCable-stayed bridges with a floating system (i.e., there is no connection between the tower column and main girder) are naturally seismically isolated structures in the longitudinal direction; velocity-related viscous fluid dampers (VFDs) are commonly installed to restrain the longitudinal displacement during strong earthquake vibration and to release the temperature stress under service load
Cable-stayed bridges with a floating system are naturally seismically isolated structures in the longitudinal direction; velocity-related viscous fluid dampers (VFDs) are commonly installed to restrain the longitudinal displacement during strong earthquake vibration and to release the temperature stress under service load
The yielding steel damper shows its general effect on reducing relative displacement between all piers/tower columns and the main girder as well, with only a localized effect on controlling seismic induced forces
Summary
Cable-stayed bridges with a floating system (i.e., there is no connection between the tower column and main girder) are naturally seismically isolated structures in the longitudinal direction; velocity-related viscous fluid dampers (VFDs) are commonly installed to restrain the longitudinal displacement during strong earthquake vibration and to release the temperature stress under service load. Traditional tower–girder connections that restrain the movement of the girder by using a transversally fixed but longitudinally free friction plate bearing are commonly designed to meet the requirement of service load, such as wind and vehicles, in China. Such structural measures may lead to a higher seismic demand on the tower columns and the substructure under transversal intensive ground motions.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
