Vibration Control Study Of Prestressed Composite Truss Floor Under The Pedestrian-induced Loads

With the development of modern economy and the improvement of scienceand technology, Space grid structure toward more large span and large space。Space truss structure with features of light weight and good overall stiffness，Itsnatural frequencies tend to be low and Easy to move closer to personalinduced(1.5Hz~2.5Hz). When a person walking on the floor. it s easy to produceresonance.and raise questions about comfort.This article first proposed sandwich plate method for the acceleration of aspace truss structure is derived theoretically and fundamental frequency analyticformula, Theoretical analysis under the loads of people to the structure of thepeak acceleration and the relationship between the fundamental frequency.Taking one composite space truss structure in Tianjin and Hebei normaluniversity gymnasium beam string structure for the engineering background ofresearch of comfort.A medium based on a variety of pedestrian load conditions for it. Timehistory analysis was carried out on the structure and theoretical analysis and thetwo structures are compared, Further study of structure after joining tuned massdamper (TMD) case of damping effect. In carries on the tuned mass damper(TMD) parameters optimization analysis, This article adopts the geneticalgorithm and the TMD parameters adjustment method were optimized. andcompared to two optimization mode. It is concluded that the genetic algorithm inmulti-parameter optimization advantages. Is adopted in this paper for the Hebeinormal university gymnasium of TMD parameters adjustment method iscommonly used in engineering optimization. And compare the results of TMDparameters with Beijing Qi Tai vibration control Co., LTD. Verify the accuracy ofthe finite element modeling and the rationality of the TMD parameters.