提出一种矩形钢管混凝土束风力机塔筒结构,并对该塔筒结构双盖板穿芯螺栓连接节点进行高周疲劳试验和有限元分析,得到节点的疲劳破坏模式和疲劳寿命。结果表明：矩形钢管混凝土束风力机塔筒双盖板穿芯螺栓连接节点疲劳破坏模式为高强螺栓受剪破坏,破坏集中在钢板连接处。螺栓在钢砼连接面和螺帽处产生疲劳裂纹,在剪切疲劳作用下,穿芯螺栓断裂为3段。有限元分析表明,螺栓规格对试件疲劳性能影响较大,增加螺栓直径,能提高节点的疲劳寿命,但疲劳极限值会减小;盖板厚度对疲劳性能影响不明显。
Abstract
A rectangular concrete-filled steel tubular bundle wind turbine tower structure is proposed. High-cycle fatigue tests and finite element analysis were carried out on the double-plate through-core bolt connection joint of this tower. The fatigue failure mode and fatigue life of the joint were obtained. The results show that the fatigue failure mode of this double-plate through-core bolt connection joint is shear failure of the high-strength bolts. The damage is concentrated at the junction with the steel plate. Fatigue cracks in the bolts at the steel-concrete joint face and at the nut. The core-piercing bolt fractures in three parts under shear fatigue. Finite element analysis shows that the specification of bolts has obvious effects on the fatigue properties of specimens. If the bolt diameter is increased, the fatigue life of joints will be increased but the fatigue limit will be reduced. The thickness of the plate has no significant effect on fatigue properties.
关键词
风力机塔筒 /
螺栓连接 /
疲劳试验 /
矩形钢管混凝土束 /
有限元分析
Key words
wind turbine towers /
bolted joints /
fatigue testing /
rectangular concrete filled steel tube bundle /
FEA
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基金
国家自然科学基金（51978571）; 陕西省杰出青年基金（2021JC-41）; 陕西省重点研发计划项目（2022SF-199）; 西安理工大学优硕种子基金（310-252082110）
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