| Concrete-filled steel tube lattice wind power towers have the characteristics of high strength and rigidity,high material utilization rate,and convenient installation and transportation,which have become the preferred choices for wind power towers today,and have broad application prospects.However,at present,there is a problem that it is difficult to guarantee high-altitude welding.Based on the above problems,the research group proposed a lattice steel tube concrete-steel concrete bolt-bolt spherical node tower.In this paper,the lattice tower steel concrete ball bolted ball joint plane tower is used as the research object,and the web thickness is used as the control parameter for the seismic test research and ABAQUS finite element analysis.The main research results are as follows:Based on the existing research results,a lattice ball stud joint was proposed,the initial size of the tower was initially determined,and the tower prototype was subjected to wind load,aerodynamic thrust,and fan gravity load calculations.The SAP2000 was used to calculate the internal force and displacement of the tower Calculate the strength and stability of the section,and check the displacement and maximum displacement between the tops of the towers.The calculation shows that the size of the primary column and the web element meet the requirements.Based on the scale of the tower prototype,two experimental plane tower models with the web wall thickness as the control parameter were obtained.The tower model was selected for the base size and reinforcement calculations,and the weld position and weld strength were checked.And determine the test materials,loading device,loading system,measurement scheme.Repeated low-cycle tests on two plane towers showed that the failure modes of the specimens were all strength failures at the joint locations.The hysteresis curves are not full anti-S shapes,and the specimens are greatly affected by the sliding force.As the wall thickness of the web increases from 4mm to 6mm,there is almost no yield displacement,ultimate displacement,and ultimate load of the tower.The impact,the yield load decreased by 10.4%,the viscosity coefficient increased by 16.1%,the internal forces of the inclined web members in all layers increased,and the internal force share of the transverse web members increased by 14.2%;the maximum stress position of the tower appeared in the upper inclusion The lower side of the connection with the table reaches 380 MPa.ABAQUS was used to numerically analyze the experimental model and perform parameter expansion analysis.The analysis showed that the tower had buckling failure when the tube diameter ratio γ was below 0.08,and the strength failure of the node connection occurred when the tube diameter ratio γ was not less than 0.08.When the ratio of pipe diameter was increased from 0.06 to 0.08,the specimen’s elastic stiffness,forward peak load,reverse peak load and ultimate displacement increased by 25.2%,13.4%,10.2% and 12.5%,respectively.When the diameter ratio is higher than 0.08,the growth rate decreases.When the tower diameter thickness ratio increased from 0.028 to 0.037,the elastic stiffness,forward peak load,reverse peak load and ductility coefficient increased by 29.7%,53.3%,61.3% and 2.0% respectively,and the yield displacement and limit displacement decreased by 8.0% and 6.1% respectively. |
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