斜拉桥拉索风雨激振的试验研究-《郑州大学学报(工学版)》

文章信息/Info

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

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

摘要:: 风雨激振现象是斜拉桥拉索在风雨共同作用下经常发生的一种激烈的大幅振动,危害性很大,涉及固、液、气三态,情况复杂.为了揭示风雨激振的一些内在规律,进行了人工降雨雨振试验和人工水线雨振试验.通过人工降雨雨振试验,再现了拉索风雨激振现象,通过人工水线雨振试验,研究了水线的大小和位置、斜拉索动力参数及偏转角等对风雨激振的影响.试验结果表明:在拉索表面形成一定大小的上水线是拉索发生风雨激振的必要条件,且上水线要在拉索表面特定的范围内形成;增大阻尼和自振频率可有效减小拉索的风雨激振振幅;拉索的风雨激振现象只能发生在一

Abstract:: 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