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为研究主跨1 400m斜拉桥在80m·s-1检验风速下的抗风性能,在风洞中进行了法向风和斜风下的节段模型试验,确定了气动控制措施与改良后主梁断面,并进行了全桥气弹模型试验,验证了控制措施的有效性,获取了全桥风致振动响应数据。研究结果表明:采取适当的颤振控制措施,在抗风稳定性方面,该1 400m跨径斜拉桥方案具有可行性;随跨度增大,静力与颤振失稳竞争更为激烈;斜风效应对静力、颤振失稳临界风速及涡振振幅均有影响;静力稳定性重新成为超千米级斜拉桥抗风性能的控制因素。
In order to study the wind resistance of the main span of 1 400m cable-stayed bridge under the wind speed of 80m · s-1, the model tests of section under normal wind and oblique wind were carried out in the wind tunnel. The aerodynamic control measures and the improved Main girder section, and carried out a full-bridge aeroelastic model test to verify the effectiveness of control measures, obtained the full-bridge wind-induced vibration response data. The results show that: With appropriate flutter control measures, the 1 400m span cable-stayed bridge is feasible in terms of wind-resistant stability; the competition between static force and flutter instability becomes more intense as the span increases; The wind effect has an impact on the static wind speed, the critical wind speed of flutter instability and the amplitude of the vortical vibration. The static stability has again become the control factor of the wind-resistance performance of the over-1000-m cable-stayed bridge.