Experimental study on wind and rain excitation of cable-stayed cables

cable-stayed bridges;  Lasso;  Wind and rain excitation;  Wind tunnel testing

The phenomenon of wind and rain excitation is a kind of violent and large vibration that often occurs under the combined action of wind and rain of cable-stayed bridge cables, which is very harmful, involving solid, liquid and gas three states, and the situation is complicated. In order to reveal some internal laws of wind and rain excitation, artificial rain vibration test and artificial waterline rain vibration test were carried out. Through the artificial rain rain vibration test, the wind and rain excitation phenomenon of the cable was reproduced, and the influence of the size and position of the waterline, the dynamic parameters and deflection angle of the cable-stayed cable on the wind and rain excitation were studied through the artificial waterline rain vibration test. The test results show that the formation of a certain size of the upper water line on the surface of the cable is a necessary condition for the wind and rain excitation of the cable, and the upper water line should be formed within a specific range on the surface of the cable. Increasing the damping and self-resonance frequency can effectively reduce the wind and rain excitation amplitude of the cable. The wind and rain excitation phenomenon of the cable can only occur in one