Vehicle-Bridge Coupled Vibration Control For Double Girder Steel-Concrete Composite Girder Bridges Based On PTMD

Steel-concrete composite girder bridge is widely used in medium and small span bridges due to its safety,economy,environmental protection and high efficiency.Aiming at the problem of vehicle-bridge coupled vibration control for double girder steel-concrete composite girder bridges,a Pounding Tuned Mass Damper(PTMD)is designed for reducing bridge vibration caused by vehicles.Based on a 4×35 m double girder steelconcrete composite girder bridge,the vehicle-bridge coupled vibration control based on PTMD is studied.The influence of the PTMD parameters on its damping effect is also studied.The main achievements of the paper are as follows.1.The damping principle of PTMD and its superiority over traditional Tuned Mass Damper(TMD)are introduced.Based on several existing collision mechanics models,the corresponding expressions for each collision mechanics model are listed,and both their applicability and limitations are compared.Based on the basic theory of viscoelastic materials,the energy dissipation mechanism and failure process of viscoelastic materials during collision are revealed.In addition,the calculation model of PTMD is established,which provides a theoretical basis for establishing the vibration equation of vehiclebridge-PTMD coupled system.2.Both the bridge vibration equation and the vehicle vibration equation are established,and the vehicle-bridge coupled model considering the influence of bridge deck roughness is also created.Based on the collision energy dissipation mechanism of the PTMD,the vibration equation of the vehicle-bridge-PTMD coupled system of the steel-concrete composite girder bridge is established,which provides a calculation model for the vehicle-bridge coupled vibration control of the double girder steel-concrete composite girder bridge.3.The spatial finite element model of the double girder steel-concrete composite girder bridge is created,and the dynamic characteristics are analyzed.Finally,the vehiclebridge-PTMD coupled system model of the double girder steel-concrete composite girder bridge is further established.The dynamic responses of the double girder steel-concrete composite girder bridge under moving vehicle load without damping device,applying TMD and PTMD are calculated.The damping effects of TMD and PTMD are compared.In addition,the influence of PTMD parameters is also discussed in detail.4.The experimental model of a steel-concrete composite beam is designed and made,and the modal parameters of the experimental beam are obtained by the finite element analysis and measurement.The PTMD device of the experimental beam is also designed and made,and the components of the PTMD device are described in detail.The experimental study further verifies the superior damping effect of the PTMD.