单桩基础灌浆连接段受力机理分析

Numerical analysis of compression-bending behavior in grouted connections

海上风机中,上部支撑结构和基础之间的连接是通过灌浆连接段实现的。近年来,风力发电发展迅速,风力发电机的功率越来越大,对单桩基础灌浆连接段的受力性能提出了更高的要求。在复杂荷载作用下,灌浆连接段受到轴力和弯矩的共同作用,有必要对压-弯共同作用下的灌浆连接段进行受力性能的研究。采用数值分析方法,分析了压-弯作用下不同轴压比时灌浆连接段的极限承载力、钢管与灌浆料之间的接触压力情况和灌浆连接段的应力情况。同时,根据学者Lotsberg提出的弯曲承载力组成理论,通过提取钢管与灌浆料之间的接触力,并对它们进行数值积分,分析了不同轴压比下灌浆连接段抗弯承载力组分的变化规律。通过分析,明晰了带剪力键的灌浆连接段的受力性能,为设计工作提供依据。

The connection between the support structure and the pile in wind turbines is achieved by the grouted connections.In recent years,the wind turbine has developed rapidly,and the power of wind turbines is getting larger and larger,which puts forward higher requirements on the mechanical properties of the grouted connections.Under the action of complex loads,the grouted connection is subjected to the combined action of axial force and bending moment.Therefore,it is necessary to study and analyze the mechanical properties of the grouted connection under the combined action of axial force and bending moment.This paper takes the axial load ratio as a variable and the finite element analysis method is used to analyze the following cases:the stress state of the grouted connection is analyzed;the contact pressure of the steel pipe and the grout are compared;on the basis of the theory about composition of flexural capacity proposed by the scholar Lotsberg,and througth extracting the contact force between steel pipe and grout and then numerically integrating them,the variation law of the flexural capacity of grouted connections under different axial load ratios is analyzed;the uneven force of the shear keys of the grouted connections is discussed in depth.Through analysis,a deeper understanding of the compression-bending behavior of the grouted connections with shear keys can better guide the design work.