斜拉索截面信息未知时的刚度识别及索力计算

英文篇名：Stiffness Identification and Cable Force Calculation without Cable’s Section Information Available
中文刊名：湖南农业大学学报(自然科学版)
英文刊名：Journal of Hunan Agricultural University(Natural Sciences)
作者：周云 ; 易伟建
英文作者：ZHOU Yun ; YI Wei-jian (College of Civil Engineering ; Hunan University ; Changsha 410082 ; China)
中文关键词：斜拉桥 ; 索力测试 ; 刚度识别
英文关键词：cable-stayed bridge ; cable force determination ; stiffness identification
出版日期：2006-08-30
机构：湖南大学土木工程学院,湖南大学土木工程学院湖南长沙410082,湖南长沙410082
年：2006
期：04
出版单位：湖南农业大学学报(自然科学版)

摘要

用拉索振动实测数据计算斜拉桥拉索的索力时,不考虑斜拉索刚度影响的计算方法可演化为许多种.计算表明由不同计算方法造成的误差已不能忽视.斜拉桥索力检测的实例分析表明斜拉桥拉索的抗弯刚度影响是不能忽略的.在斜拉索截面信息未知的情况下,利用一种实用的拟合方法得到了拉索的刚度.在考虑刚度的影响后,计算结果表明基频法能反应中长索索力的真实值,对于短索的索力应根据基频法进行折减.用数值拟合方法对拉索截面未知情况下的拉索刚度进行了识别,改进了固支情况下索力的计算结果.
Quite a number of methods have been deduced for calculating cable forces by vibration determination without considering the effect of stiffness.The errors caused by these methods couldn’t be ignored.The measuring results of cable force of one cable-stayed bridge indicated that the effect of stiffness on cable-stayed bridge couldn’t be neglected.Without the cable’s section information available,a practical curve fitting method was used to identify the stiffness of cables.Taking the stiffness effect into account,the basic-frequency method could reflect the real forces of the medium and long cables,but the force of the short cables should be deducted according to the basic-frequency method.

引文

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