基于振动特性的超长拉索索力测定研究  

Vibration-Based Tension Identification of Ultra Long Stay Cables

作　　者：刘勇[1] 刘剑锋[2] 

机构地区：[1]江苏省苏通大桥建设指挥部,江苏南通226009 [2]同济大学桥梁工程系,上海200092

出　　处：《结构工程师》2009年第6期117-122,共6页Structural Engineers

基　　金：国家科技支撑计划项目(2006BAG04B00)

摘　　要：在超大跨度斜拉桥的施工过程和正常运营阶段,准确测试识别超长拉索的索力是一个重要课题。对苏通大桥部分超长拉索进行了现场振动测试,并分别采用试验方法和有限元分析研究其振动特性。根据拉索实测振动特性采用四种常用的理论方法识别超长拉索的索力,并对这四种方法的分析结果进行比较,讨论垂度效应及抗弯刚度等因素对超长拉索索力识别结果的影响。Tension estimation of ultra long stay cables is an important issue during the construction and service stages of long span cable-stayed bridges. In this paper, vibration responses were measured on site from the cables of the Sutong Bridge in China,which is the longest cable-stayed bridge with a main span of 1088 meter. The vibration characteristics of cables were studied by using the experimental measurements and the finite element analysis. Four commonly used theoretical methods were used and the identified results were compared with each other. The affects of some factors for cable tension identification of this kind of ultra long cables were discussed,such as sag-extensibility and bending stiffness.

关 键 词：拉索 振动 自振频率 索力 

分 类 号：U443.38[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]