Mechanical Property Analysis of Spherical Joints of Concrete-Filled Steel Tubular Wind Power Towers
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摘要:
为寻找更适合钢管混凝土格构式风电塔架的节点形式，开展了2个法兰盘球型分支节点和2个法兰盘螺栓球节点模型的静力试验，并对其进行有限元分析，以球台高度和厚度为变化参数，分别对比了2种节点的破坏模式、法兰盘等效应力分布、腹杆轴力-变形曲线等. 研究结果表明：法兰盘球型分支节点的破坏模式为高强螺栓剪切破坏，法兰盘螺栓球节点的破坏模式为球台焊缝撕裂破坏和屈曲-撕裂破坏；与法兰盘球型分支节点相比，法兰盘螺栓球节点的法兰盘和球台的等效应力分布均匀，材料利用率较高，其最大应力绝对值分别提高了19%、52%，承载能力较强；腹杆轴力-变形曲线的塑性阶段长，延性较好；对球台高度或厚度的变化反映在节点极限承载力上更敏感，有更高的极限承载力；法兰盘螺栓球节点有进一步推广应用的价值.
Abstract:In order to find a more suitable joint form for the concrete-filled steel tubular (CFST) lattice wind power tower, static tests of models for two flanged spherical branch joints and two flanged bolted spherical joints were carried out, and the finite element analysis was performed. By taking the height and thickness of the table as the changing parameters, the failure modes of the two kinds of joints, the equivalent stress distribution of the flange, and the axial force-deformation curve of the web rod were compared. The research results show that the failure modes of flanged spherical branch joints are shear failure of high-strength bolts, and those of flanged bolted spherical joints are table weld tear failure and buckling-tear failure. Compared with that of the flanged spherical branch joint, the equivalent stress distribution of the flange and the table of the flanged bolted spherical joint is uniform, and the material utilization rate is higher; the absolute values of the maximum stress are increased by 19% and 52%, respectively, and the bearing capacity is strong. The plastic stage of the axial force-deformation curve of the web rod is long, and the ductility is excellent. The change in the height or thickness of the table is more sensitive to the ultimate bearing capacity of the joint, and a higher ultimate bearing capacity is observed. The flanged bolted spherical joint can be promoted and widely applied.
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表 1 试件参数
Table 1. Specimen parameters
类型 试件
编号包裹体尺寸/
mm球台外径/
mmb/mm h/mm 腹杆尺寸/
mm螺纹外径/
mm法兰盘球形
分支节点JD-1 ϕ241 × 11 ϕ122 11 50 ϕ89 × 3.5 × 700 M52 JD-2 ϕ241 × 11 ϕ114 7 60 ϕ89 × 3.5 × 700 M52 法兰盘
螺栓球节点JD-3 ϕ241 × 11 ϕ122 11 50 ϕ89 × 3.5 × 700 JD-4 ϕ241 × 11 ϕ114 7 60 ϕ89 × 3.5 × 700 
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表 2 钢材力学性能指标
Table 2. Mechanical property indexes of steels
部件 fy /MPa fu /MPa E/GPa 腹杆 300 479 204 塔柱 324 485 202 球台 302 464 199 法兰盘 316 479 201
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表 3 节点承载力
Table 3. Joint bearing capacity
试件编号 试验值/kN 模拟值/kN 误差/% JD-1 89.0 94.1 5.7 JD-2 112.0 118.5 5.8 JD-3 289.0 281.3 2.7 JD-4 369.0 351.4 4.8
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表 4 参数拓展结果
Table 4. Parameter expansion results
节点编号 h/mm b/mm Nuf1/kN Nuf2/kN A-1 50 6 70.9 213.1 A-2 7 78.1 222.3 A-3 8 82.1 231.1 A-4 9 88.2 248.5 A-5 10 90.6 264.6 A-6 11 94.1 281.3 A-7 12 94.9 287.9 B-1 55 6 85.1 251.1 B-2 7 96.3 261.1 B-3 8 100.3 278.3 B-4 9 106.5 292.8 B-5 10 108.8 325.7 B-6 11 111.4 341.7 B-7 12 112.1 342.4 C-1 60 6 105.1 334.8 C-2 7 118.5 351.4 C-3 8 120.6 363.3 C-4 9 123.1 373.2 C-5 10 125.9 395.2 C-6 11 128.6 413.4 C-7 12 129.7 416.6 D-1 62 6 112.6 348.3 D-2 7 124.9 363.3 D-3 8 128.9 371.7 D-4 9 132.3 382.3 D-5 10 134.5 405.2 D-6 11 136.4 423.4 D-7 12 136.7 424.9
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