Dams and Special Structures

Abstract

Rain vibration of cables is becoming a matter of great concern recently in Japan for design and construction of cables-stayed- bridges. The features of rain vibration are the strong influence of rain on wind-induced oscillation of cable. The cables in cable-stayed bridges, which are stable with respect to wind acting in dry condition, became very unstable with rain, and large amplitude oscillation of cable could be developed under low speed wind around10m/s. for the first time this phenomena have been seen in the bridge Meiko-Nishi (Japan) and after in the others cable-stayed bridges as: Aratsu, Higashi - Kobe (Japan), Domitz (Germany), Erasmus (Holland) est. Many analytical and experimental investigations have been made for known the influence of different factors that produce this phenomenon in much country, especially in this country that is attacked by this phenomenon as: Japan, Germany, Holland, France EST. The reason of this seminar work is to make UN representation to this phenomenon, to represent same some analytical and experimental investigation made by different authors and conclusion yielding from this investigation. Here are presented first the response of cables on the excitation by the wind and after are compared with the response under the couplet excitation << Rain-Wind >>The principal parameters that give a grate influence in this phenomenon can be classified in two groups. First the group of the situation of cable were included: the orientation of cable, wind speed, reins intensity. In second group named cables properties were are included natural periods, damping ratio and property of the surface of cables. We point here the fact that even many investigation are made this phenomenon is not well known, the reason for this is the fact that the excitation couplet Rain - Wind is very complex