| As an important part of daily transportation hub,bridge engineering is also an indispensable lifeline project after the earthquake.Therefore,the bridge structure needs to have strong seismic performance.Because of the complexity of the bridge structure environment and uncertainty of the earthquake,the bridge structure is likely to be suffered more than its seismic fortification intensity of earthquake,in order to ensure that even a bridge structure in the rarely met earthquake under the action of the rarely met earthquake safety,reduce the harm of bridge structure seismic action,this paper puts forward a available Tuned Damper and Friction Friction damping energy dissipation of Tuned Mass Damper(Tuned Friction Mass Damper,TFMD for short),the main research contents of the following:1.The principle of action of tuned friction mass damper and the theoretical formula of restoring force: the structure design of TFMD device was proposed,the principle of action of TFMD device was discussed,the theoretical formula of restoring force of TFMD was deduced,the restoring force model of TFMD was established,and the amplification formula of inertia force and friction force was given.2.Harmonic excitation analysis of tuned friction mass damper single degree of freedom structural system:The simple harmonic vibration analysis of the single-degree-of-freedom TFMD structural system with or without damping was carried out respectively,and the analytical solutions of the structural responses were derived.The correctness of the analytical solutions was verified by the numerical analysis program compiled by MATLAB.The damping effect of uncontrolled structure and TFMD controlled structure is compared.The harmonic excitation parameters of TFMD single-degree-of-freedom structural system are analyzed,and the influence of main parameters on the displacement response amplitude of the structure is discussed.The energy analytical solution of a single degree of freedom(DOF)TFMD system under harmonic excitation during a vibration period is derived.3.Seismic response analysis of single degree of freedom structure system with tuned friction mass damper: the programming steps of TFMD structure system are introduced;The time-history analysis of the seismic response of the TFMD single-degree-of-freedom structural system is carried out,and the influences of mass ratio and friction force on the structural damping effect are considered.The response spectrum of TFMD single-degree-of-freedom structural system was analyzed,and the variation of parameters on the response spectrum was considered.The energy time-history analysis of TFMD single-degree-of-freedom structural system is carried out,and the influence of parameters on the energy dissipation ratio is considered.By applying the same structure and device parameters in SAP2000 and MATALB respectively,the rationality of TFMD finite element simulation and the correctness of programming were verified.4.Study on seismic performance of continuous girder bridge considering tuned friction mass damper: in SAP2000 software to establish finite element model of continuous girder bridge,the bridge structure modal analysis,get the dynamic response characteristics of the structure of the bridge and determine the main modal vibration mode of the structure of the bridge and determine the parameters of TFMD device,in the continuous bridge bearing arrangement TFMD device,separately E2 earthquake and extremely under the action of the rarely met earthquake seismic performance analysis of continuous girder bridge. |
