Abstract：Flutter is rather destructive to bridges, so the flutter stability is one of the most important wind-resistant behaviors. The torsional stiffness and flutter stability of super long span suspension bridges can be enhanced significantly by cross hangers. In this paper, the influences of two kinds of cross hangers on the dynamic property of a super large span suspension bridge with a 3500m span and CFRP (carbon fiber reinforced plastics) cables were studied from the point of frequencies and natural vibration shapes. The influence curves of fundamental frequency of vertical bending and torsion versus the position of cross hangers were obtained. According to the influence curves, 11 arrangement plans of cross hangers were proposed. Step-by-step method was used to analyze the flutter stability of the 11 plans. The results show that connecting the two cables in the total length of main span using horizontal cross hangers and setting up vertical cross hangers between cable and girder at 1/3 of main span and middle of side span can improve the flutter stability of super long span suspension bridge dramatically and the critical flutter velocity is improved by 49%.
李翠娟 李永乐 唐茂林 强士中. 交叉吊索对超大跨CFRP主缆悬索桥颤振性能的改善作用[J]. 土木工程学报, 2017, 50(3): 83-90.
Li Cuijuan Li Yongle Tang Maolin Qiang Shizhong. Improvement of flutter stability of super long span suspension bridge with CFRP cable by crossed hangers. 土木工程学报, 2017, 50(3): 83-90.
