水资源与水工程学报2017，Vol.28Issue(2)：197-203,7.DOI:10.11705/j.issn.1672-643X.2017.02.34
损伤钢筋混凝土U形梁的非线性动力特性识别研究
Nonlinear dynamic characteristics identification of damaged reinforced concrete U-shaped beam
周奎 1陈思宇 1陈妮娜 1林杰1
作者信息
- 1. 上海理工大学土木工程系,上海200093
- 折叠
摘要
Abstract
In order to study the relationship between the nonlinear dynamic characteristics and the impairing degree of reinforced concrete U-shaped beam,a static and dynamic testing on a simply supported reinforced concrete U-shaped beam with a scale ratio of 1∶10 was conducted in this paper.The static loads on the beam caused different degrees of damage.At all levels of damage load conditions,dynamic test on the U-shaped beam were conducted and the acceleration-time signal were collected.Finally,the filter and the EMD were applied to decompose the first and the third order frequency signal of each state.Then the Hilbert transform was used to identify the first and the third order amplitude-time curve and frequency-time curve of each state,and the frequency-amplitude chart and normalized frequency -amplitude comparison charts were obtained.By analyzing the curves,the relationship between nonlinear dynamic characteristics of the reinforced concrete U-shaped beam and its damage levels were obtained.The structural nonlinear dynamic characteristics can be used to detect damage for those structures which needed high integrity.But for the common U-shaped beam or other structures,only using the nonlinear dynamic characteristics to detect damage was unreliable,the structural nonlinear dynamic characteristics can be regarded as a means to warning damage or to be used with others detection method.关键词
钢筋混凝土U形梁/非线性动力特性/时频分析/Hilbert-Huang变换/损伤检测Key words
reinforced concrete U-shaped beam/nonlinear vibration characteristics/time-frequency analysis/Hilbert-Huang transformation/damage detection分类
建筑与水利引用本文复制引用
周奎,陈思宇,陈妮娜,林杰..损伤钢筋混凝土U形梁的非线性动力特性识别研究[J].水资源与水工程学报,2017,28(2):197-203,7.
