基于时域相关分析的结构损伤指数
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摘要
阐述了一种基于时域相关分析的结构损伤指数,并进行了该指数的实验研究,目的是探讨一种对损伤敏感的损伤识别方法。试验模型为具有4根柱子的2层钢框架,模型通过底部4根桩埋在土壤里。在底层柱顶端设置缺口代表损伤,设计了2种损伤,有限元数值模拟分析得到的基频变化率分别为0.42%和0.94%。采用激振器对底板进行正弦激励,激励频率为25Hz。利用顶板和中板响应计算该损伤指数,绘制了损伤指数及其变化率与结构损伤程度的关系曲线。结果显示,该指数对损伤敏感,具有进行损伤判定与标定的潜力。
A structure damage indicator based on time domain correlation analysis is expatiated.Experiment of this indicator is done for the purpose of exploring a damage identification method which is subitale to little damage.The experiment model is a 2-floors steel frame with four columns.The model is settled in soil through four piles.Damage slots are made at the top of the first floor columns and two damage conditions are considered.The first order frequency change percentages,0.42 percent and 0.94 percent,are calculated through numerical simulation.The model bottom is excited by an exciter which gives 25 HZ sinusoidal excitation.The indicator is calculated by using top and middle floor response and the indicator's change percentage curves with the damage degree are plotted.The result of experiment shows that the indicator is sensitive to damage and it has the potential to judge and evaluate the structure damage.
A structure damage indicator based on time domain correlation analysis is expatiated.Experiment of this indicator is done for the purpose of exploring a damage identification method which is subitale to little damage.The experiment model is a 2-floors steel frame with four columns.The model is settled in soil through four piles.Damage slots are made at the top of the first floor columns and two damage conditions are considered.The first order frequency change percentages,0.42 percent and 0.94 percent,are calculated through numerical simulation.The model bottom is excited by an exciter which gives 25 HZ sinusoidal excitation.The indicator is calculated by using top and middle floor response and the indicator's change percentage curves with the damage degree are plotted.The result of experiment shows that the indicator is sensitive to damage and it has the potential to judge and evaluate the structure damage.
引文
[1]张敏政.地震工程的研究和应用———回顾与展望[J].国际地震动态,2004,9:4~10.
[2]L iang Z,Lee G C.A new param eter of signature Analysis for Large E lastic Structures.Proceed ings of the 3 rd InternationalW orkshop on StructuralHealth Mon itoring[C].CA:CRC Press,2001.393~402.
[3]Box G E P,Jenk ins G M.Tim e series analysis forecasting and control[M].USA:Holden-Day Press,1970:30~34.
[2]L iang Z,Lee G C.A new param eter of signature Analysis for Large E lastic Structures.Proceed ings of the 3 rd InternationalW orkshop on StructuralHealth Mon itoring[C].CA:CRC Press,2001.393~402.
[3]Box G E P,Jenk ins G M.Tim e series analysis forecasting and control[M].USA:Holden-Day Press,1970:30~34.
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