基于高斯曲率模态相关系数的梁桥支座损伤识别研究

Research on damage identification of beam-bridge bearing based on gaussian curvature modal correlation coefficient

为方便地检测梁桥支座损伤,提出了利用运营桥梁实测模态位移结合其无损状态的模态位移判断支座损伤的高斯曲率模态相关系数法。通过简支梁桥的室内试验,验证了利用高斯曲率模态相关系数判定支座损伤的合理性以及该方法中无损状态下的模态位移可以通过模态试验和有限元模拟两种方法获得。利用该方法对实际简支梁桥和连续梁桥进行的支座损伤识别结果表明:高斯曲率模态相关系数法可准确识别出单支座和多支座损伤的支座损伤位置,具有较强的鲁棒性,可将此方法应用于实际工程中的支座损伤识别。

In order to conveniently detect the bearing damage of the beam bridge, a Gaussian curvature modal correlation coefficient method was proposed to determine the bearing damage by using the measured modal displacement of operating bridge combined with the lossless modal displacement. Through the indoor test of simply supported beam bridge, the rationality of determining the damage of the bearing by Gaussian curvature modal correlation coefficient was verified. The modal displacement in the lossless state can be obtained by modal test and finite element simulation. The damage identification results of the support of the actual simply supported beam bridge and the continuous beam bridge using this method indicated that the Gaussian curvature modal correlation coefficient method can accurately identify the bearing damage position whether it is single bearing damage or multiple bearing damage. And this method can be applied to bearing damage identification in practical engineering.