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吊杆是中、下承式拱桥的主要受力构件,其结构损伤影响桥梁的安全,因此,吊杆的损伤识别是结构健康监测的重要工作之一。本文以一座柔性桥面系中承式拱桥为对象建立了三维空间有限元模型并以锈蚀、断丝等引起的吊杆截面缺损作为损伤指标,通过数值模拟研究了结构振动特性与吊杆损伤之间的相关性。研究结果表明,模态曲率对结构损伤较为敏感,损伤识别的效果较好并在此基础上提出了综合运用结构自振频率变化、桥面结构模态曲率变化以及吊杆内力变化进行柔性桥面系中承式拱桥吊杆损伤识别的实用算法。
The boom is the main load-bearing component of the middle-and-under-span arch bridge. The structural damage of the boom affects the safety of the bridge. Therefore, the damage detection of the boom is one of the important tasks of structural health monitoring. In this paper, a three-dimensional finite element model of a three-dimensional finite element model of a semi-arch bridge with flexible bridge deck is established. The damage of boom section due to rust and broken wire is taken as an indicator of damage. The structural vibration characteristics and the damage of the boom Relevance between. The results show that modal curvature is more sensitive to structural damage and damage identification is better. On the basis of this, modal curvature is proposed by comprehensively using the change of natural frequency, the change of modal curvature of deck structure and the change of inner force of boom, A Practical Algorithm for Identifying Suspension Bar Suspension Damage of Arch Bridge.