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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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钢筋混凝土拱基于模态频率的承载能力评估
, PP. 63-66
Keywords: 桥梁工程,钢筋混凝土拱,极限承载能力,模态频率,损伤
Abstract:
基于钢筋混凝土拱破坏过程中模态频率的变化规律，进行了承载能力评估方法的研究。对某旧桥中的2根钢筋混凝土拱肋进行了加载过程中的模态试验。基于试验结果和有限元分析研究了有初始损伤和完好的钢筋混凝土拱破坏过程中的模态变化规律，并采用曲线拟和的方法对钢筋混凝土拱的极限承载能力进行了预测。结果表明，该拱接近破坏时模态频率会下降，但各阶模态频率的下降程度与最弱刚度截面的位置有关；拱破坏过程中第1阶模态频率值与所受荷载之间的关系可近似用二次方程来描述。
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