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天蒙人行悬索桥主跨420m,跨越山谷连接两个观景山峰。为了研究天蒙人行悬索桥的抗风性能,通过节段模型风洞试验测定了主梁的静气动力系数、涡振响应和颤振稳定性。分析研究表明:纵横型钢组合的格构式主梁截面不易激发涡激振动;封闭栏杆防护网底部能够提高主梁的颤振稳定性;封闭后的改进断面会显著影响升力系数和升力矩系数,封闭面积不大时对阻力系数影响不大。研究结论可为类似大跨人行悬索桥提供设计参考。
Tian Meng pedestrian suspension bridge main span 420m, connecting two peaks across the valley. In order to study the wind resistance of the suspension bridge in Tianmeng, the static aerodynamic coefficient, the vortex-induced response and the flutter stability of the main beam were measured by the wind tunnel model of the segmental model. The analysis and research shows that the cross section of the lattice girder of vertical and horizontal steel is not easy to induce vortex induced vibration; the bottom of the guardrail can improve the flutter stability of the main girder; the improved cross section after closure can significantly affect the coefficient of lift and the torque coefficient, Small closed area has little effect on the drag coefficient. The conclusion of the study can provide design reference for similar large-span pedestrian suspension bridge.