π型截面涡激振动风洞试验及气动抑制措施研究

Researches on π-Section Vortex-Induced Vibration Wind Tunnel Testing and Aerodynamic Suppression Measures

对某大跨斜拉桥进行节段模型风洞试验,研究该桥采用π型断面时抑制主梁涡激振动的气动措施。对其主梁节段模型进行涡激振动试验,通过对比研究,检验中央稳定板及改变栏杆透风率的气动措施的有效性。并借助CFD仿真技术,分析主梁断面周边绕流特性,探索气动措施抑制涡激振动的机理。结果表明,气动措施可以改善π型截面梁空气动力学特性,得到了抑制涡激振动的目的。

A section model wind tunnel test is conducted for a large span cable-stayed bridge,and the aero-dynamic measures to restrain the bridge girder vortex-induced vibration with a π-section are studied.The com-parison of the vortex-induced vibration tests for main beam segment model is made to verify the effectiveness of central stabilizer and drafty openings in rail.With CFD simulation technology, flow characteristics around the main girder section are also analyzed to find the mechanism of aerodynamic measures to resist vortex-induced vi-bration.The results indicate that the aerodynamic measures can improve the aerodynamic characteristics of π-section and reduce vortex-induced vibration.