Numerical Analysis And Test Study On Vibration Control Of Cable Damper System

Cable is a kind of flexible structural members, which is vibrated easily under the external excitations (e.g. the load induced by wind, rain, earthquake and traffic) as an important component of the cable-stayed bridge. The excessive vibration of the cable will lead to the fatigue of itself and anchorage structure which will affect its lifetime and safety. Therefore, bridge designers have focused on these problems for a long time. This paper aimed at the problem of cable vibration, based on the vibration control theory, numerical simulation method was adopted to analyze and study the problem of cable vibration controlled by dampers systematically, which is including:(1) The theory of vibration, the method of cable vibration control and the results of experiment research at home and abroad were summarized;(2) Taking the sag of cable into consideration, the mechanics model of the cable was established, and the curve equation and the cable sag formula were deduced. The mechanics system of geometric nonlinear suspension model of cable-damper system was established. The expressions for the frequency of the cable were set up by applying the method of the harmonic balance.(3) The cable continuous model was dispersed, and the cable influenced by the damper parameters was numerically calculated by central difference method.The cable damper parameters influenced finite element simulated by using ANSYS software. Analyzing the influence of the change of parameters of the damper on the dynamic characteristics of cable-stayed;(4) Aimed at the LMD damper, the test study were carried out in the laboratory and the field, the criteria and effects of the vibration-suppression damper were verified.