基于参数离散化的梁式桥损伤识别方法

发布时间：2019-07-03 10:49

【摘要】：针对梁式桥提出了一种基于参数离散化的损伤识别方法,并以结构动力指纹、实测位移、速度、结构刚度矩阵及其影响矩阵为变量,提出了全面损伤指标I1和精准损伤指标I2,通过数值模拟和实桥试验验证了该损伤识别方法的敏感性和抗噪性.结果表明,损伤指标I1和损伤指标I2均能有效实现梁式桥的损伤识别,且损伤指标I1具有更好的损伤敏感性和抗噪性,而损伤指标I2相对漏诊的可能性较低.在新沂河大桥损伤识别中,损伤指标I1能基本拟合梁式桥裂缝分布,较全面地反映出桥梁的损伤概况;而损伤指标I2对梁式桥中的重大损伤更为敏感,对于桥梁重大病害损伤识别的抗干扰性较高,能较准确反映桥梁结构的主要损伤.基于参数离散化的损伤识别方法可从本质上揭示梁式桥刚度损伤的数学形式,有效应用于梁式桥损伤识别中.
[Abstract]:A damage identification method based on parameter discretization is proposed for beam bridge. Taking the structural dynamic fingerprint, measured displacement, velocity, structural stiffness matrix and its influence matrix as variables, the comprehensive damage index I1 and precision damage index I2 are proposed. The sensitivity and anti-noise of the damage identification method are verified by numerical simulation and real bridge test. The results show that both damage index I1 and damage index I2 can effectively realize the damage identification of beam bridge, and the damage index I1 has better damage sensitivity and noise resistance, but the possibility of missed diagnosis of damage index I2 is relatively low. In the damage identification of Xinyi River Bridge, the damage index I1 can basically fit the crack distribution of the beam bridge and reflect the damage situation of the bridge in an all-round way, while the damage index I2 is more sensitive to the major damage in the beam bridge, and has higher anti-interference ability for the damage identification of the major diseases of the bridge, and can accurately reflect the main damage of the bridge structure. The damage identification method based on parameter discretization can essentially reveal the mathematical form of stiffness damage of beam bridge, and it can be effectively applied to the damage identification of beam bridge.
【作者单位】：东南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51178101,51378112)
【分类号】：U441.4

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