T构桥振动过大病害的动力测试及分析

Dynamic Test and Analysis of T-type Rigid Bridge Damage due to Excess Vibration

针对某T构桥在运营过程中振动过大现象,选取了另一座上部结构相同而基础形式略有不同的实桥进行对比。对2座桥各关键部位的振动情况进行了测试,对于病害桥和对比桥的振动响应数据分别进行了幅值特征和频谱特征比较,并结合模态分析对结构振害进行了诊断,主要从构造对比、结构缺陷和静力刚度几个方面分析桥梁纵向振动过大的病害原因,即:钢管桩的局部刚度过弱。为进一步的振动控制设计提供了依据。所提出的振害诊断方法具有较好的可实施性,可为同类型结构提供参考。

Aimed at the excess vibration phenomenon in the operation process of one T-type rigid bridge, another bridge which with the same type of superstructure and slightly testing the vibration condition of key positions of two bridges, between the two bridges was made. The structure vibration different foundation form was chosen for contrast. the comparative analysis of amplitudes and spectra damage was diagnosed in combination with modal analysis, and the damage reasons of the excess longitudinal vibration were discussed from the aspects of tectonic comparison, structural defects and structure stiffness. The most important reason is the partial weak stiffness of the steel pipe piles. This provides an evidence for the vibration control design. The presented method for vibration damage diagnosis has a better practicality and can be a reference for the same type of bridges.