| 损伤梁动力特性的空间有限元分析 |
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| 引用本文： | 杜金龙,郭少华.损伤梁动力特性的空间有限元分析[J].铁道科学与工程学报,2008,5(2):17-22. |
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| 作者姓名： | 杜金龙 郭少华 |
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| 作者单位： | 1. 同济大学,地下建筑与工程系,上海,200092
2. 中南大学,土木建筑学院,湖南,长沙,410083 |
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| 基金项目： | 教育部高等学校博士学科点专项科研基金 |
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| 摘 要： | 以钢筋混凝土梁为研究对象,基于Euler-Bernoulli梁理论和结构动力学理论,考虑混凝土的非线性本构关系,通过空间动力有限元分析,得到不同裂纹状态下梁的固有频率和模态振型,研究裂纹对简支梁振动响应的影响。研究结果表明:损伤结构动力特性对损伤的敏感性并不能简单地归结为对高频一定敏感,对低频一定不敏感,应视裂缝位置与振型节点关系而论。
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| 关 键 词： | 损伤梁 动力特性 固有频率 模态振型 |
Space finite element analysis of dynamic characteristics of damaged beam |
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| DU Jin-long,GUO Shao-hua.Space finite element analysis of dynamic characteristics of damaged beam[J].Journal of Railway Science and Engineering,2008,5(2):17-22. |
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| Authors: | DU Jin-long GUO Shao-hua |
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| Abstract: | Regarding the reinforced concrete damaged beam as the research object considering the nonlinear stress-strain relation of concrete based on Euler-Bernoulli beam and structure dynamics theory,through analysis of dynamic finite element,the natural frequency and modal shape in various kinds of damage states were obtained,and the effect of crack on dynamic characteristic was studied.The results indicate that the sensitiveness of the damaged structure's dynamics characteristics to damage can't be simply concluded as: high frequency will be certainly sensitive and low frequency will not.The sensitiveness is related to crack position and the node of modal type. |
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| Keywords: | damaged beam dynamic characteristic natural frequency modal shape |
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