浙江电力

2020, v.39;No.294(10) 47-52

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超高压电缆隧道中FRP-铝合金组合截面悬臂梁螺栓群的受力分析
Stress Analysis of Bolt Group Connecting FRP-Aluminum Alloy Composite Section Cantilever Beam in EHV Cable Tunnel

杨隆宇
YANG Longyu

摘要(Abstract):

FRP(环氧树脂-E玻纤复合材料)具有轻质高强、绝缘性能好的优点,铝合金易于加工和连接,通过螺栓连接的FRP-铝合金组合截面梁变形协调,可充分发挥各自优势。为分析螺栓连接对组合截面构件承载力、延性的影响,建立考虑螺栓、 FRP架、铝合金H梁相互作用及初始缺陷的非线性有限元模型,计算结果表明:FRP架的凹槽对铝合金H梁上部肢约束较好,限制了其局部屈曲,比单独的H梁承载力提高54%,构件延性也更好;连接FRP架与H梁的螺栓群受力不均匀,靠近转轴的根部螺栓是主要受力部件,中间螺栓的个数、间距对承载力影响在3.8%以内;螺栓预紧力不提高组合截面构件承载力。
FRP(fiber reinforced polymer) features lightweight, high strength and insulation performance, and aluminum alloy is easy to process and connect. Through deformation compatibility of the bolt-connected FRPaluminum alloy composition cantilever beam, the advantages of both can be exerted. For impact analysis of bolt connection on bearing capacity of the components and ductility, a nonlinear finite element model based on bolts, FRP bracket, the interaction of aluminum H type beam and initial defects is established. The calculation result shows that the groove of the FRP bracket can better restrain the upper parts of the aluminum H type beam by limiting partial distortion, and the bearing capacity is 54% higher than a single H type beam and the component ductility is better; the stress of the bolt group that connects FRP bracket and H type beam is not even, and the root bolts near the shaft are the major bearing parts, and the impact of the number and spacing of middle bolts on bearing capacity is with 3.8%; bolt pretension does not change the bearing capacity of composite section.

关键词(KeyWords): FRP;铝合金;螺栓连接;有限元分析;超高压电缆隧道;悬臂梁
FRP;aluminum alloy;bolt connection;finite element analysis;EHV cable tunnel;cantilever beam

Abstract:

Keywords:

基金项目(Foundation): 中国能源建设股份有限公司众筹科技项目(CEEC2019-KJ04)

作者(Author): 杨隆宇
YANG Longyu

DOI: 10.19585/j.zjdl.202010008

参考文献(References):

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