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大跨度刚性梁柔性拱桥的H形吊杆,由于长细比较大,轴力却不甚大,容易发生低风速下的涡激振动,从而导致杆件连接部位的疲劳.应用国外近代开发的阻尼动力吸振器,与其它抑振措施相比,就其工作量、经济性、保持结构外形而言,都要优越得多.本文结合实桥吊杆的涡振问题,采取多个小型的参数分离的阻尼动力吸振器,成功地抑制了吊杆的涡激振动.它的附加质量,调谐比,有效阻尼及抑振倍率均达到振动控制的目标值.
Due to the slenderness ratio, the axial force is not very big, and the vortex-induced vibration under low wind speed easily occurs, which leads to the fatigue of the connecting parts of the rod.Application of the damping power developed in foreign countries Vibration absorber, compared with other vibration suppression measures, is much superior in terms of its workload, economy and maintaining the shape of the structure.In this paper, combining with the vortex vibration problem of the real boom, a number of small parameters The damping dynamic vibration absorber successfully restrain the vortex-induced vibration of the boom, and its additional mass, tuning ratio, effective damping and vibration suppression magnification reach the target of vibration control.