School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China.
Department of Mechanical Engineering, University of Houston, Houston, TX 77204, USA.
Sensors (Basel). 2019 Mar 6;19(5):1133. doi: 10.3390/s19051133.
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.
风致和随机交通荷载引起的公路桥梁的动力响应通常超过预期值，调谐质量阻尼器（TMD）已被广泛应用于抑制桥梁结构的动力响应。在本研究中，设计了一种新型的 TMD 系统，称为碰撞调谐质量阻尼器（PTMD），它由调谐质量和覆盖碰撞能量耗散的粘弹性层组成。对具有多个 PTMD（MPTMD）的风/交通/桥梁耦合系统进行了全面的数值模拟。通过结合交通中桥梁和车辆的运动方程，建立了耦合方程。为了比较抑制效果，研究了不同数量和位置、质量比和 MPTMD 碰撞刚度的参数研究。模拟表明，MPTMD 的数量和质量比对抑制风/交通/桥梁耦合振动都有重要作用；然而，碰撞刚度对抑制桥梁振动不敏感。
