摘要
提出一种基于倾角仪和振型分解法的桥梁结构挠度测试方法,包括倾角仪的位置和数目的确定方法。在不同荷载工况下,分析各阶振型对于给定点处挠度的贡献,并以此作为确定拟合所采用振型阶数的依据,同时指出倾角测点数目必须大于或等于采用的振型阶数,且测点应分散布置在各振型的倾角峰值点。以三种常见桥型为例,阐述确定振型阶数和测点位置的方法,并在此基础上分析拟合效果。计算结果表明,采用少数几阶奇数阶振型且测点布置在各振型的倾角峰值时,能够对桥梁主跨跨中挠度进行较好的拟合。该方法也可推广用于建筑结构整体变形的测试。
Base on inclinometers and the orthogonality of the mode shape,a method of bridge deflections testing is given.The method includes the process of determining the inclinometer's position and number.Base on the analysis of the deflections contributions of each mode for the given section under the different loading cases,the mode order for fitting has been confirmed.The number of inclinometers must be equal or larger than the number of modes using for fitting.The inclinometers should be installed on the oblique peaks of each mode.Using the special characters of the symmetrical bridge modes,inclinometers should be laid on the oblique peaks of odd modes and symmetrically by the mid-span.Finally,based on three general bridge types,the modes order and inclinometers positions are determination and the fitting effect are checked under two cases.The results indicate that the deflections of mid-span section can be fitting well using several odd modes with the inclinometers on the oblique peaks of each mode.
出处
《土木工程学报》
EI
CSCD
北大核心
2010年第S2期106-111,共6页
China Civil Engineering Journal
基金
国家自然科学基金(90715032
50978009)
北京市教育委员会科技计划重点项目(KZ200910005002)
关键词
桥梁
挠度测试
倾角仪
振型函数
bridge
deflections testing
inclinometers
mode functions
