基于高斯曲率相关系数的斜交梁桥支座损伤识别方法

支座损伤会对桥梁结构动力特性造成严重影响。针对宽跨比较大的斜交梁桥支座病害中普遍存在的刚度不足甚至脱空现象,本文将一维曲率模态推广到二维,并引入高斯曲率模态相关系数,通过对比支座损伤时各振型控制点与未受损时的相关程度来判断支座损伤位置。以天津津港高速公路Y线斜交梁桥为研究对象,建立相关数值模型来分析高斯曲率模态相关系数。结果表明:对于单支座或多支座损伤,相应支座处的高斯曲率模态相关性系数与其他支座位置处的差异明显,可实现损伤定位;现场模态测试结果与理论模拟结果吻合较好,证明了此方法的有效性。

Bearing Damage Identification Method for Skew Beam Bridge Based on Gauss Curvature Correlation Coefficient

The bearing damage has a serious inf luence on the dynamic characteristics of the bridge structure.Aiming at the common phenomenon of insuff icient stiffness and even void in bearing diseases of skew girder bridges with large span ratio,the one-dimensional curvature mode was extended to two-dimensional and the Gauss curvature mode correlation coeff icient was introduced in this paper.The damage location of the bearing was judged by comparing the correlation between the control points of each vibration mode and that of the undamaged one.Taking Tianjin J ingang expressway Y-line skew beam bridge as the research object,the relevant numerical model was established to analyze the Gauss curvature mode correlation coeff icient .The results show that for the single bearing or multi-bearing damage,the Gauss curvature mode correlation coeff icient of the corresponding bearing is obviously different from that of other bearings,and the damage location can be realized.The f ield mode test results are in good agreement with the theoretical simulation results,which proves the effectiveness of the method.