Vibration Control Analysis Of Large Span Floor Stucture Induced By Human-induced Loads

With the increase of the floor structure span,the vibration frequency of the floor structure is reduced.The resonance phenomenon happens more obvious under human-induced loads.It will seriously affect the human comfort,make it feel nervous or uncomfortable,although vibration will not bring impact to the safety of the structure.Reveals the human body comfort of the large-span floor structure,perfect the methodology of the multiple tuned mass dampers on the floor vibration control and optimization design,and using the method to design MTMD of thecable supported beam structure-concrete slab composite floor of a beam string structure,the main research contents and conclusions are as follows:(1)From the perspective of control force,the vibration reduction mechanism of TMD system under multi-degree-of-freedom system is studied.Based on this,a TMD filter model is established,and the way to reduce TMD dynamic response under random input is studied.The study found that the essence of TMD system control is inertial force;When the parameter setting of TMD system is reasonable,TMD absorbs the external input of each frequency band in a certain ratio.(2)Based on the dynamic coupling equation,the participant approach of the position-related terms in the MTMD vibration control was investigated.The finite element method and the modal analysis method were used to construct the combined optimal method of MTMD parameter and location.(3)ABAQUS software is used to establish the finite element model of long-span floor.According to the functional zoning,eight building load conditions were designed.The finite element dynamic analysis of the floor was carried out.It is found that the structure has comfortable question under the load of human activities.(4)The MTMD optimization scheme is designed for the response of this structure.The optimal combination of MTMD position and parameters is obtained by optimizing MTMD system.The dynamic analysis shows that MTMD can effectively control the vibration of large span floor.The vibration acceleration of floor structure is effectively restricted.