针对目前风机塔筒结构发展受限于结构高度与安装效率的问题,本文提出了一种 L 型螺栓连接的矩形钢管混凝土束剪力墙风机塔筒,并且针对螺栓关键连接区域进行了力学性能研究.最后通过有限元建模的方法对塔筒单片矩形钢管混凝土束剪力墙在面外以及面内荷载下的性能表现进行了分析,并且给出了相关设计建议.研究结果表明塔筒螺栓连接区域在单轴拉伸下的破坏模式为连接板弯曲变形以及螺栓拉断.塔筒单片剪力墙的面内初始刚度及承载力要显著高于面外.综合考虑剪力墙力学性能的提升效率以及剪力墙各部件的应力分布状态,建议当螺栓直径为20mm时,连接板厚度不应大于螺栓直径;建议当连接板厚取 20mm时,螺栓直径取其 1.2 倍.
Study on mechanical properties of L-shaped connection of fan tower with concrete-filled rectangular steel tubular beam shear wall
In order to address the current structural development of wind turbine towers by the structural height and installation efficiency,this paper proposes an L-shaped bolted rectangular steel tube concrete bundle shear wall wind turbine tower and investigates the mechanical proper-ties of the key bolted connection areas.Also,the performance of a single rectangular steel tube bundle shear wall is analyzed by means of finite element modelling under out-of-plane and in-plane loading,withrelevant design recommendations given.The results show that the damage modes for the tower bolt connection are bending deformation of the connection plate and bolt pull-off.The initial in-plane stiffness and load carrying capacity of the single shear wall are significantly higher than those of the out-plane.Taking into account the efficiency of the shear wall mechanical properties and the stress distribution of the shear wall components,it is recommended that when the bolt diameter be 20 mm,that the thickness of the connection plate be not greater than the bolt diameter.When the connection plate thickness is 20 mm,it is recommended that the bolt di-ameter be 1.2 times what it is.
bolted connectionL-shaped jointwind turbine towersfinite element
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