导管架平台桩土动力相互作用试验研究

为了研究实际平台在饱和土体中的桩土-结构相互作用,建立了缩比模型的导管架平台桩土相互作用试验系统,采用激振器激励的方式,利用MaCras机械及结构模态分析软件测试了所建导管架模型在不同水深下的自振特性。借助ABAQUS/Standard中的管土相互作用单元对试验模型进行了数值模拟,将数值模拟结果与试验结果进行了对比。对比结果发现,用PSI单元模拟桩土动力相互作用能够获得较高的精度,且建立的有限元模型计算效率较高,相对于桩土实体模型或者等效固支模型来说具有明显的优点。

Experimental Study of the Pile-soil Dynamic Interaction of Jacket Platform

To study of the pile and soil-structure interaction of practical platform in saturated soil,the pile-soil interaction test system of the scaled model of jacket platform was established.Adopting the excitation mode of the vibration exciter,the MaCras machinery and structural modal analysis software was used to test the natural vibration property of the jacket model established in different water depths.The numerical simulation of the test model was conducted by means of the pipe-soil interaction unit in the ABAQUS/Standard.The simulation result was compared with the test result.The comparison shows that adoption of the PSI unit to simulate the pile-soil interaction can obtain the relatively high precision.The calculation efficiency of the finite element model established is also high.It has its own remarkable strengths,compared with the pile-soil solid model or equivalent clamped support model.