大跨度CFRP缆索悬索桥的抗风稳定性能  

Wind Resistance Performance of Long-span Suspension Bridges with CFRP Cables

作　　者：李扬[1,2] 肖汝诚[1] 

机构地区：[1]同济大学桥梁工程系,上海200092 [2]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《同济大学学报（自然科学版）》2012年第4期499-507,共9页Journal of Tongji University:Natural Science

基　　金：国家"八六三"高技术研究发展计划(2006AA11Z120)

摘　　要：以主跨为2 000～5 000m的悬索桥为研究对象,利用悬索桥静风稳定和颤振稳定的非线性有限元计算方法,分析了CFRP(碳纤维增强塑脂)缆索悬索桥的抗风性能.对比研究指出,采用了CFRP缆索后,静风失稳风速将降低,而颤振失稳风速则略微提高,这是由缆索质量降低和扭转基频提高的综合作用引起的.为了进一步提高CFRP缆索悬索桥的抗风性能,讨论了一系列相应的改善措施,并对其有效性进行了验证.结果表明:增大矢跨比对提高抗风性能有一定的作用;当主跨为3 000m级或以下时,可以采用辅助拉索;当主跨达到4 000m级时,可以采用带有稳定板的中央开槽箱梁;当主跨超过5 000m时,则应采用分离式中央窄断面或宽开槽断面.. A research was made of the wind resistance performance of 2 000- 5 000 m long suspension bridges with carbon fiber reinforced polymer （CFRP） cables based on non- linear aerostatic and aerodynamic finite element method. The comparison study shows that the critical aerostatic velocity will decrease but the critical flutter velocity will increase after using CFRP cables, which is caused by the combined effects of cable weight and torsional frequency. In order to improve wind resistance performance, a study was made of a serial of schemes and their effectiveness. The results show that increasing rise-span-ratio is effective; auxiliary cables can be used within 3000 m or narrower span; for 4 000 m span, central slotted girder with guard fences can be applied; if themain span is longer than 5 000 m, narrowly slotted or widely slotted section is recommded.

关 键 词：悬索桥 碳纤维 静风稳定 颤振 

分 类 号：U442[建筑科学—桥梁与隧道工程] U448.25[交通运输工程—道路与铁道工程]