【摘要】 利用有限元软件,建立了某钢筋混凝土简支梁不同位置损伤的模型,通过降低弹性模量的方法模拟模型的损伤程度,分别对损伤不同程度的模型进行了模态分析,结合曲率模态理论,求解模型相应的曲率模态。研究结果表明,梁的频率与位移模态对梁的局部损伤均不敏感,而由位移模态进一步推导得到的梁的曲率模态对梁的局部损伤较敏感。曲率模态可为梁的健康诊断提供可靠的依据。更多还原

【Abstract】 The models of reinforced concrete beams which had different damage location were established in this paper with the help of FEM software.The models’ damage degree were simulated by reducing the elastic modulus,and the models’ modes with different degree of damage were analyzed,the models’ corresponding curvature modes were solved combined with the theory of curvature mode.The results of research showed that,the frequency and displacement mode of the beam were not sensitive to local damage,while the curvature mode of the beam which was derived from displacement mode was sensitive to local damage.That is to say,the curvature mode could provide a reliable basis for the health diagnosis of the beam.更多还原