单面碰撞TMD及其桥梁涡激振动控制研究

Single-side pounding TMD and its application in bridge’s VIV control

单面碰撞调谐质量阻尼器(SS-PTMD)是一种新型减振装置,通过惯性力和黏弹性碰撞进行结构减振,针对SS-PTMD动力性能、碰撞力模型与验证、SS-PTMD桥梁节段模型涡振控制等开展了理论与试验研究。根据质量块单边运动受限和碰撞的特点,获得了SS-PTMD的动力特性;开展了钢-黏弹性材料碰撞试验,提出了碰撞力模型,根据试验数据识别了碰撞力模型参数,并验证了碰撞力模型;通过1∶40桥梁节段模型涡激振动风洞试验,发现+7°风攻角下出现了明显的涡激振动,根据简谐力涡激力模型识别了模型气动参数;采用仿真分析评估了SS-PTMD控制桥梁涡激振动的效果,在质量比2%及最大涡振振幅风速条件下的减振效率达到87%;通过风洞试验研究了SS-PTMD涡激振动控制效果,在质量比2%及最大涡振振幅风速条件下的减振效率达到92%;理论分析和试验结果表明,SS-PTMD对桥梁涡激振动具有很好的减振效果。

Single-side pounding tuned mass damper(SPTMD)is a new type of vibration reduction device to reduce structural vibration with inertial force and viscoelastic pounding.Here,dynamic performance of SPTMD,pounding force model and verification,and VIV control of bridge segment model with SPTMD were studied theoretically and tested.According to features of a mass block’s single-side motion restriction and collision,the dynamic performance of SPTMD was obtained.Impact tests between steel and viscoelastic material were conducted.The impact force model was proposed,its parameters were identified with test data and the model was verified.VIV’s wind tunnel tests were conducted for a bridge segment model with scale of 1:40.The results showed that obvious VIV appears under wind attack angle of +7°.The model’s aerodynamic parameters were identified according to the simple harmonic vortex excitation force model.The effect of SPTMD to control bridge’s VIV were estimated with simulation analysis,the results indicated that the vibration reduction efficiency can reach 87% under conditions of 2% mass ratio and the maximum VIV amplitude wind velocity.The effect of SPTMD to control bridge’s VIV was studied with wind tunnel tests,the results indicated that the vibration reduction efficiency can reach 92% under conditions of 2% mass ratio and the maximum VIV amplitude wind velocity.The theoretical analysis and test results indicated that SPTMD has good vibration reduction effect on bridge’s VIV.