CFRP拉索阻尼特性实验研究和理论分析  

THEORETICAL ANALYSIS AND EXPERIMENTAL TEST ON DAMPING CHARACTERISTICS OF CFRP STAY CABLES

作　　者：谢旭[1] 中村一史[2] 前田研一[2] 张治成[1] 榎本刚 

机构地区：[1]浙江大学土木工程系,浙江杭州310058 [2]日本首都大学东京都市环境系,日本东京都192-0397 [3]日本东京制纲株式会社,日本东京都103-8306

出　　处：《工程力学》2010年第3期205-211,216,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(50578141)

摘　　要：为了掌握CFRP拉索的阻尼特性以及建立相应的评价方法,用自由衰减振动试验方法测试了CFRP索、钢索以及CFRP丝、钢丝的阻尼特性,并用能量耗散原理以及振动理论探讨了拉索的结构阻尼和空气阻尼计算方法。结果表明:钢索的阻尼变化与应变能的比例关系明显,实测阻尼值与应变耗能理论计算结果一致,而CFRP拉索的阻尼实测值与理论结果之间存在一定的差异。长度1.8m的单丝阻尼与对应的应变大小相关性不大,应变耗能理论不能评价其阻尼特性,支点产生的阻尼效果不可忽视。In order to investigate the damping properties of CFRP cables and establish an evaluation method for this problem,the damping properties of CFRP cables,steel cables,CFRP wires and steel wires are tested by the free vibration decaying of cables and wires.The structural damping and aerodynamic damping properties of cables are analyzed using energy dissipation principle and vibration theory respectively.It is shown that,for steel cable,the correlation between damping and strain energy ratio is significant,and the tested damping agrees with the calculated one by energy dissipation theory of strain.But for CFRP cable,a distinction exists between the tested and calculated damping.For wires with length of 1.8 m,the correlation between tested damping and strain is small.The damping caused by cable support is not negligible.

关 键 词：CFRP索 钢索 阻尼特性 衰减振动试验 应变能比例阻尼 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]