新型多边形组合钢管受压构件性能研究
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摘要
由于应力集中、焊接缺陷、残余应力等因素的不利影响,在动力荷载作用下焊接结构的疲劳强度远低于钢材的强度设计值,导致传统钢管或箱形截面构件的受压性能不能充分发挥。因此,提出一种完全使用螺栓连接的新型多边形组合钢管截面形式,采用有限元软件对新型多边形组合钢管的轴压性能进行分析,得到其稳定系数曲线和稳定系数拟合表达式。计算结果表明,当多边形组合钢管的长细比较小时,其稳定系数曲线略微优于《钢结构设计标准》(GB50017—2017)中的b类截面稳定系数曲线,当多边形组合钢管的长细比较大时,其稳定系数曲线更接近于c类截面稳定系数曲线,为今后实际工程应用该新型多边形组合钢管提供了设计参考。
Due to the adverse effects caused by stress concentrations, weld defects, residual stresses and so on, the fatigue strength of welded structure is far below the strength design value of steel when the structure subjected to the dynamic loads. So the compression performance of traditional steel pipe or box section members can not be fully utilized. Therefore, a novel type of polygon combined steel tube-section was proposed, which can be connected by bolts completely. The axial compression behavior of polygon combined steel tube-section member was analyzed by finite element software and the stability coefficient curve and the fitting formula of stability coefficient was obtained. The calculation results show that the stability coefficient curve of this novel polygon combined steel tube-section member is a little better than the stability coefficient curve of type b section specified by the Standard for design of steel structures(GB 50017—2017) when the slenderness ratio is small. The stability coefficient curve of the proposed section is closer to the stability coefficient curve of type c section when the slenderness ratio is large. The results can provide the design reference for engineering application of this novel polygon combined steel tube-section member in the future.
Due to the adverse effects caused by stress concentrations, weld defects, residual stresses and so on, the fatigue strength of welded structure is far below the strength design value of steel when the structure subjected to the dynamic loads. So the compression performance of traditional steel pipe or box section members can not be fully utilized. Therefore, a novel type of polygon combined steel tube-section was proposed, which can be connected by bolts completely. The axial compression behavior of polygon combined steel tube-section member was analyzed by finite element software and the stability coefficient curve and the fitting formula of stability coefficient was obtained. The calculation results show that the stability coefficient curve of this novel polygon combined steel tube-section member is a little better than the stability coefficient curve of type b section specified by the Standard for design of steel structures(GB 50017—2017) when the slenderness ratio is small. The stability coefficient curve of the proposed section is closer to the stability coefficient curve of type c section when the slenderness ratio is large. The results can provide the design reference for engineering application of this novel polygon combined steel tube-section member in the future.
引文
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[2]DEHM J.160-m-fachwerkturm für eine windenergieanlage:die h?chste windenergieanlage der welt[J].Stahlbau,2007,76(4):213-221.
[3]SEIDEL M.Jacket substructures for the RE power 5Mwind turbine[C]//Conference Proceedings European Offshore Wind.Berlin,2007.
[4]GENCTURK B,ATTAR A,TORT C.Optimal design of lattice wind turbine towers[C]//15th World Conference on Earthquake Engineering.Lisbon,2012:24-28.
[5]NEGM H M,MAALAWI K Y.Structural design optimization of wind turbine towers[J].Computers and Structures,2000,74(6):649-666.
[6]建筑施工扣件式钢管脚手架安全技术规范:JGJ 130-2011[S].北京:中国建筑工业出版社,2011.
[7]钢结构设计标准:GB 50017-2017[S].北京:中国建筑工业出版社,2017.
[8]ZHANG J H,YOUNG B.Compression tests of cold-formed steel I-shaped open sections with edge and web stiffeners[J].Thin-Walled Structures,2012,52:1-11.
[9]ZHANG J H,YOUNG B.Numerical investigation and design of cold-formed steel built-up open section columns with longitudinal stiffeners[J].Thin-Walled Structures,2015,89:178-191.
[10]钢结构工程施工质量验收规范:GB 50205-2001[S].北京:中国计划出版社,2002.