NONLINEAR FINITE ELEMENT ANALYSES OF THE CONCRETE-FILLED STEEL TUBULAR WIND TURBINE TOWER JOINTS

摘要

The failure mode and ultimate bearing capacity of wind generator latticed concrete-filled circular steel tubular welded K shape unstiffened joints and gusset plate joints were studied under axial loads by finite element program ABAQUS,and the main parameters were analyzed,the influence laws of diameter-thickness ratio γ of tower column,diameter ratio β between web member and tower column,joint gap a and joint plate thickness tg on the failure mode and ultimate bearing capacity of the two kinds of joints were investigated.Results show that for the unstiffened welded K-joints,the γ and β have more significant influence on the failure mode and bearing capacity.The bearing capacity decreases with the increase of the γ and reduce of the β under the same failure mode.While the influence of gap g on the failure mode and bearing capacity is relatively smaller.For the welded gusset plate K-joints,the joint plate's thickness directly affect the failure mode and bearing capacity,and the buckling failures along the buckling lines and the fractures along the tear lines of gusset plates occur when the joint plates are thinner,so the design control areas of the joint plates are obvious the buckling lines and tear lines.The bearing capacity is mainly determined by the stability bearing capacity of joint plates.While the failure mode turns into the buckling of compression web member when the thickness of joint plate is up to a certain value and the bearing capacity are decided by the buckling load of the web members.The finite element analysis results can provide some references for engineering design.