气动措施对斜拉索风荷载和结构响应的影响.pdf

第27 卷 第3 期 建筑科学与工程学报 V ol. 27 No. 3 2010 年9 月 Journal of A rchitecture and Civil Engineering Sept. 2010 : 1 73-2049( 2010) 03- 0089-05 刘健新, 李 哲 ( , 7100 4) : 以浙江宁波象山港公路大桥为 , 对比了光索螺旋线索凹坑索在低高2 种风速下受到的 风荷载和结构响应的差异结果表明: 在绝大多数情况下, 采用气动措施的螺旋线索受到的风荷载 均大于光索受到的风荷载; 不同形式斜拉索风荷载最大差值达到荷载值的 %, 由拉索风荷载引 起的主跨塔底弯矩响应比重达到全桥风荷载塔底弯矩响应的24%, 由其引起的主跨跨中弯矩响应 比重甚至达到4 . 3% , 应对此予以充分的关注 : 斜拉索; 气动措施; 风荷载; 结构响应; 风阻系数; 弯矩响应 : U44 1. 2 : A Influence of Aerodynamic Measure on Wind Load and Structural Response of Stayed-cable LIU Jian-xin, LI Zhe ( School of H ighway , Changan University, Xi an 7100 4, Shaanxi, China) Abstract: T aking Ningbo Xiangshan Port Bridge of Zhejiang Province as an example, the differences of the w ind loads and structural responses caused by smooth cables, screw thread cables, pitted cable at high and low w ind speeds w ere compared. T he results show that the w ind load caused by aerodynamic measures is larger than smooth cable in the most cases. T he maximum difference among w ind loads on different forms of stayed-cable is about %, the tow er bottom bending moments caused by the w ind load of stayed-cable take the proportion of 24% to ful-l bridge bending moments of the w ind load, the mid-span bending moments of main span caused by the w ind load of stayed-cable take the proportion of 4 . 3%, sufficient attention should be paid to the conclusion. Key words: stayed-cable; aerodynamic measure; w ind load; structural response; w ind resistance coefficient; bending moment response 0 , , , ,