压弯荷载下单桩基础灌浆连接段性能分析

  目的  海上风机中，上部风电机组和钢管桩基础的连接是通过灌浆连接段来实现的。近年来，风力发电机的功率越来越大，对灌浆连接段的受力性能提出了更高的要求。  方法  采用数值分析方法，分析了压-弯作用下固定轴压比时灌浆连接段结构参数对受力性能的影响。从灌浆厚度t_g、剪力键高距比h/s以及灌浆连接段长径比L/D_p三个重要参数出发，分析了灌浆连接段荷载位移曲线的变化、灌浆连接段端部接触压力分布的变化以及灌浆连接段应力状态。  结果  数值分析结果表明:灌浆连接段的三个尺寸参数t_g，h/s和L/D_p 的变化均会对其力学性能产生影响。  结论  通过对灌浆连接段各结构参数进行分析，对保证其正常工作具有重要意义，同时可以指导设计工作。

Mechanical Properties of the Grouted Connection Under the Action of Compression-bending Load

In the offshore wind turbine， as the connection form of the upper wind turbine and the steel pipe pile foundation， the grouted connections are widely used. In recent years， the power of wind turbines has become larger and larger， and higher requirements have been placed on the performance of the grouted connection.  Method  In this paper， the numerical analysis method was used. And the influence of the parameters of the grouted connection on its mechanical properties was analyzed. Based on the thickness of the grout t_g， the ratio of height to distance of shear keys h/s and the ratio of length to diameter of the grouted connection L/D_p， the change of the load-displacement curve ， the variation of contact pressure distribution and the stress state was analyzed.  Result  The results of numerical analysis show that the changes of the three dimensional parameters t_g， h/s and L/D_p of the grouted connections will affect its mechanical properties.  Conclusion  By analyzing the structural parameters of the grouted connections， it is of great significance to ensure its normal operation and guide the design work.