CFRP拉索的非线性参数振动特性  

Property of Nonlinear Parametric Vibration of CFRP Cables

作　　者：梅葵花[1] 吕志涛[2] 孙胜江[1] 

机构地区：[1]长安大学桥梁与隧道陕西省重点实验室,陕西西安710064 [2]东南大学土木工程学院,江苏南京210096

出　　处：《中国公路学报》2007年第1期52-57,共6页China Journal of Highway and Transport

基　　金：国家高技术研究发展计划("八六三"计划)项目(2001AA336010);国家自然科学基金重点项目(50238030);国家自然科学基金项目(50178018);江苏省自然科学基金重点项目(BK20000361)

摘　　要：建立了CFRP拉索的非线性参数振动模型,该模型考虑了拉索同时受梁端和塔端激励的状况,并考虑了索的垂度、大位移等引起的几何非线性;利用该模型,对相同条件下的CFRP拉索和钢拉索,采用数值方法分析了频率匹配比、拉索静拉力、激励幅值以及阻尼等因素对拉索参数振动特性的影响。研究结果表明,拉索振动的拍频、幅值与上述因素均有关,且CFRP拉索在参数振动发生几率、参数振动响应等方面优于钢拉索。A nonlinear parametric vibration model for CFRP cables was established, which could consider the condition of excitations at both beam end and tower end and took the influences of geometry nonlinearity induced by hanging degree and big displacement of cable into account. By using this model, numerical results of CFRP cables and steel cables with the same condition were obtained. The results demonstrate that the vibration relates with the matching ratio of natural frequencies of stay cable to bridge deck, static tension forces of cables, excitation amplitude and damping ratio. It is found that CFRP cables are prior to steel cables on the probability and response of parametric vibration.

关 键 词：桥梁工程 CFRP拉索 数值方法 参数振动 斜拉桥 振动模型 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]