渡槽桩-土-槽墩相互作用模型模态实验研究

Modal tests for pile-soil-pier Interaction of an aqueduct model

通过采用自制的传感器布设装置,把加速度传感器放入钢管桩内,采用子结构技术把结构分为两个子结构,对打入实际土层的钢管桩进行了横向位移模态的测试,同时,对槽墩也进行了模态测试实验。实验结果表明槽墩与桩有着相同的自振频率,并且组合形成了桩-槽墩系统振动模态。采用大型通用有限元软件ABAQUS进行了桩-槽墩系统的自振特性分析,有限元计算中对桩-土相互作用采用了简化模拟的方法,计算结果与试验结果基本吻合;并同刚性地基模型进行比较,其结果显示,在渡槽的设计中不能忽略桩-土相互的作用。

A new Self-made device was used. With it, acceleration sensors were put into a steel pipe pile for modal tests. Substructure technique was used and an aqueduct structure was divided into two substructures, one was the steel pipe pile knocked into soil, and the other was the pier. Modal tests were conducted for both of them. Test results showed that the pier and the pile have the same natural frequencies, they were combined to form vibration modes of the pile-soilpier system. A finite element model for this system was established and analyzed with ABAQUS. The results were consistent with the test results. Compared with the rigid foundation model, the results indicated that the pile-soil interaction can not be ignored in design of an aqueduct.