摘要
在地震等反复荷载作用下,钢结构节点易发生脆性断裂,且由此导致的结构破坏在钢结构事故中的频率很高。通过对一钢框架模型的动力响应信号进行希尔伯特-黄变换处理,结构选取不同程度单节点、双节点和三节点的损伤工况,利用MATLAB程序对钢结构节点损伤信号进行经验模态分解(EMD)并导出各阶固有模态函数分量,以瞬时频率拟合值作为损伤识别指标,分析对比结构不同位置损伤信号。
The steel connections are prone to brittle fracture under seismic cycle loading, with the result that structural destruction occurs frequently in steel structure. This paper shows the application of Hilbert-Huang transform in response signal processing of the steel frame model in different cases. IMF components were obtained by using MATLAB software to analyze damage signals of steel connections in the EMD decomposing process, and the fitted values of instantaneous frequency was studied as one of the damage identification indexes to make a contrast of structure damage signals with different locations.
出处
《钢结构》
2014年第7期22-26,共5页
Steel Construction
关键词
损伤识别
钢结构节点
HHT瞬时频率
damage identification
steel conneetion
HHT instantaneous frequency
