Mechanical Behavior Research On Lattice Wind Turbine Tower Joints Of Concrete-filled Steel Tubular

This paper takes a1.5MW wind turbine tower as a reference object which located in InnerMongolia Bay an Obo area, and designed a lattice tower of Concrete-filled Steel Tubular (CSFT) byload calculations. The mechanical behavior study of tower joints model including tubular joints andtube plate joints of CSFT was performed by using the method of experimental combine with finiteelement analysis, and analyzes the failure mode, stress and strain distribution law of static behavior.The experiment results show that the failure mode of CFST tubular joints are compression webmember’s local buckling and the tube plate joints are plate buckling. Tower column tube has notobviously plastic deformation when the joints failure. Two kinds of joints have stress concentration,and the high stress area of CFST tubular joints is located in pillar wall gap, the crown and the saddle.The load-carrying capability in tower column tube wall of the corner of gusset plate, the gussetplate’s middle and end part is most adverse, which are the weak positions of CFST tube plate joint.Based on the experimental testing, the effects of some parameters on the bearing capacity andthe failure mode are discussed by ABAQUS finite element analysis. The results show that theultimate bearing capacity of CFST tubular joint is1.44times larger than empty tubular joint, and thegrouting in pillar change the failure characteristics. But the contribution in mechanical behavior ofconcrete to tube plate joints is little. The ultimate bearing capacity of CFST tubular joint isconnected with the diameter ratio of web member and tower column and diameter-thickness ratio oftower column, which are the important influencing factor. The thickness of gusset plate takes alimited ability to improve the bearing capacity of CFST tube plate joint.Through the CFST wind tower joints models’ test research and finite element analysis, wepreliminary master the tower joints’ mechanical behavior, which can provide reference for thedesign and construction of wind power tower.