海上风机基础灌浆连接段轴心受压承载力数值分析

Numerical Study on Axial Load Bearing Capacity of Grouted Connections in Offshore Wind Turbine Foundation

采用有限元分析方法,对海上风机基础灌浆连接段进行数值参数分析,主要研究了径向刚度、长径比和剪力键高距比对轴心受压承载力的影响,分析了套管与灌浆料之间接触压力的分布规律。研究结果表明,径向刚度的增加可以增强套管和桩管对灌浆料的约束效应,提升灌浆连接段的轴心受压极限承载力和延性;长径比能够提升灌浆连接段轴心受压承载力,但随着长径比的提高,等效黏结强度不断减小,结构的延性也相应地降低;剪力键高距比主要通过影响灌浆段的有效剪力键对数来影响灌浆连接段的轴心受压极限承载力,因此,提升高距比能够提高灌浆连接段的轴心受压承载力。

A finite element model for the analysis of grouted connections is established,and the effects of radial stiffness,ratio of length to diameter,and height-tospace ratio of shear keys on the ultimate axial bearing capacity are studied.Besides,the distribution of contact pressure between steel tube and grout material is also analyzed.The results show that the increase in radial stiffness can enhance the restraint effect on the grout and improve the axial ultimate bearing capacity of grouted connections.The ratio of length to diameter can significantly improve the ultimate bearing capacity,but at the same time,the interface transfer strength and ductility of grouted connections decrease continuously.The heightto-space ratio of shear keys mainly affects the number of shear keys in grouted connections,thus affecting the ultimate bearing capacity of grouted connection.The increase in the height-to-distance ratio can improve the ultimate bearing capacity of grouted connection.