Abstract
Dynamic responses of highway bridges induced by wind and stochastic traffic loads usually exceed anticipated values, and tuned mass dampers (TMDs) have been extensively applied to suppress dynamic responses of bridge structures. In this study, a new type of TMD system named pounding tuned mass damper (PTMD) was designed with a combination of a tuned mass and a viscoelastic layer covered delimiter for impact energy dissipation. Comprehensive numerical simulations of the wind/traffic/bridge coupled system with multiple PTMDs (MPTMDs) were performed. The coupled equations were established by combining the equations of motion of both the bridge and vehicles in traffic. For the purpose of comparing the suppressing effectiveness, the parameter study of the different numbers and locations, mass ratio, and pounding stiffness of MPTMDs were studied. The simulations showed that the number of MPTMDs and mass ratio are both significant in suppressing the wind/traffic/bridge coupled vibration; however, the pounding stiffness is not sensitive in suppressing the bridge vibration.
Highlights
The bridge vibrations under wind and stochastic traffic loads have been extensively studied, and great successes have been achieved during the recent decades
The values of vehicular marked without system in more the figure of vehicular acceleration marked withoutacceleration suppressed system in thesuppressed figure were much than those were much more than those marked by multiple PTMDs (MPTMDs)
A new pounding tuned mass damper (PTMD) system was designed with the integration of a tuned mass and a viscoelastic-material covered delimiter for energy dissipation during impacts
Summary
The bridge vibrations under wind and stochastic traffic loads have been extensively studied, and great successes have been achieved during the recent decades. To control the dynamic response of the primary structure, a method of suppressing the vibration of structures is to use an energy dissipative system One such system is the tuned mass damper (TMD). TMDs to suppress bridge vibrations induced by combined wind and traffic loads [16,17]. Compared with a traditional TMD system, the PTMD can simultaneously suppress vibrations in two directions with easy installation and maintenance [18,19]. PTMD has larger energy dissipating capacity through impact and is more robust to the system uncertainty compared with a regular TMD [20,21,22]. The and wind/traffic/bridge/MPTMD study of the different numbers andsystem locations, mass ratio, pounding stiffness ofcoupled.
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