梁桩损伤对高桩码头固有频率特性的影响研究

Research on Influence of Beam & Pile Damage to the Natural Frequency Characteristics of High-piled Wharf

高桩码头构件众多,不同构件损伤会对码头固有频率造成不同的影响.设计了高桩码头模型,通过有限元模拟计算和物理模型试验研究梁桩损伤对高桩码头固有频率特性影响.研究结果表明:有限元模拟可对高桩码头结构损伤识别作出准确判断,损伤程度越大,固有频率变化越大,固有频率变化量可定性反映结构损伤程度;基于桩身损伤开展的动力实测试验结果与有限元模拟计算结论一致;桩损伤对码头固有频率动力特性的影响更大.

The high-piled wharf has many components, and different damages of components of high-piled wharf would exert different effects on natural frequency. A high-piled wharf mode including finite element simulation calculation and physical model test,was designed to explore the influence of beam and pile damage on natural frequency characteristics of high-piled wharf.The results showed that finite element model could accurately identify the damage of high-piled wharf structure. Larger damage indicated greater change of natural frequency. The variation of natural frequency could depose qualitatively the damage degree of the structure.The results of the dynamic test based on the pile damage were consistent with the conclusion of finite element simulation calculation. The influence of pile damage on natural frequency characteristics of wharf was greater.