基于损伤柔度曲率矩阵的人行天桥损伤识别研究

为了研究基于损伤柔度曲率矩阵的损伤识别方法在人行天桥上的适用性,将此方法用于人行天桥模型和实际工程的桥梁结构分析中。通过对人行天桥简支钢箱梁损伤前的完好结构及各类损伤工况下的损伤结构进行数值模拟,得到各工况下的这一损伤识别指标的损伤识别性能,对其进行分析。之后将此方法用于实际的人行天桥动力模态试验中,在随机环境激励的情况下使用动态信号采集分析系统对人行天桥进行动力模态试验。研究发现,损伤柔度曲率矩阵这一指标对于人行天桥具有良好的损伤识别性能,并且其抗噪声能力、微小损伤识别能力以及对于实际工程的适用性能皆有良好表现。

Damage Identification of Pedestrian Bridge Based on Damage Flexibility Curvature Matrix

In order to explore the damage identification of the pedestrian bridge, the identification method based on the damage flexibility curvature matrix was applied to analyze a pedestrian bridge model and a real engineering bridge. The performance of damage identification index under different working conditions was investigated by numerical simulations on the intact and damage structure of the steel box girder. Then, the method was used in the actual dynamic modal test. Under the circumstance of random environment excitation, a dynamic signal acquisition and analysis system was used to perform dynamic modal tests on the pedestrian bridge. It is found that the index has good damage identification performance for pedestrian bridges. It performs well with high anti-noise ability, high small damage identification ability and good applicable performance on practical engineering projects.