钢管混凝土格构式风电机塔架节点静力性能试验研究

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发布时间：2021-12-02

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对 6 个钢管混凝土格构式风电机塔架焊接相贯节点和焊接管板节点进行了缩尺模型试验，研究了这两种
塔架节点的破坏机理和破坏特征、节点进入塑性后的变形发展过程以及节点交汇区域的复杂应力状态和分布规
律。试验结果表明: 塔柱钢管内混凝土的存在，使钢管混凝土节点的破坏模式和力学性能与空钢管节点大大不同，
钢管混凝土相贯节点的破坏形态为受压腹杆局部屈曲破坏，管板节点的破坏形态为节点板受压屈曲和受拉撕裂破
坏，没有出现节点区塔柱管壁在受拉、受压腹杆接头处的塑性变形失效。由试验结果还得到: 两种节点交汇处塔柱
管壁以及节点板的应力分布极不均匀，个别测点已经进入塑性而有的测点仍然处于弹性阶段。由破坏形态和节点
区的应力分布情况得到了一些设计建议，为实际工程塔架节点的设计提供参考。［关键词］钢管混凝土; 格构式塔架; 相贯节点; 管板节点; 静力性能
中图分类号: TU398 文献标识码: A 文章编号: 1002-848X( 2013) 05-0035-04 Static behavior study on latticed concrete-filled steel tubular wind turbine tower joints Li Bin1，Qiao Ming1，Gao Chunyan1，2 ( 1 Architecture and Civil Engineering Institute，Inner Mongolia University of Science and Technology，Baotou 014010，China; 2 College of Aerospace Engineering，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China) Abstract: Six latticed concrete-filled steel tubular ( CFST) wind turbine tower K-shape joints were carried on the static load test，which included the weld intersecting joint and the gusset plate joint． The failure mechanism and characteristics on the two kinds of K-shape joints，the deformation development process after joints entered plastic stage and the stress state and distribution of joint intersection area were studied． The results show that the failure mode and mechanical behavior of CFST K-shape joints are greatly different from that of the hollow steel tubular K-shape joints because of the existence of core concrete，the failure mode of the weld intersecting joints show the local buckling of compression web member and that of the gusset plate joints present as the compression buckling and tension tearing of the gusset plates，while the plastic deformation failure of tower column tube wall in joint area is not appear． It is also shown by test results that the stress distribution of tower column tube wall and gusset plate in joint intersection is extremely non-uniform，individual parts already enter plastic state but some other parts are still in elastic state． According to the failure mode and stress distribution conditions of the two kinds of K-shape joints，some design suggestions are drawn，which can provide reference for the latticed CFST wind turbine tower joints． Keywords: concrete-filled steel tube; latticed tower; weld intersecting joint; gusset plate joint; static behavior * 国家自然科学基金项目 ( 51068021 ) ，包头市科技攻关项目
( 2010Z1002，2011Z1006) ，内蒙古自然科学基金项目( 2012MS0711) 。
作者简介: 李斌，博士，教授，Email: btlibin@ 189． cn。 0 引言
近几年来，风力发电作为新能源战略的领头军
越来越受到人们的重视。塔架作为风力发电机组中
的主要支承装置，将风电机与地面连接，为水平轴叶
轮提供需要的高度，其重要性随着风力发电机组容
量、高度的增加而愈来愈明显。塔架结构按其结构
形式可分为锥台式、格构式等几种形式。目前在国
际风电市场上，大型风力发电机组普遍采用的是锥
台式塔筒。格构式塔架与锥台式塔筒相比，耗材少、
运输成本低，在高度和刚度设计要求相同的情况下，
材料消耗约减小 40% ，能进一步降低风电成本，尤
其是近年高度超过 100m 的塔架中，格构式塔架结
构的高性价比吸引着各国学者的目光［1］。
为保证风力发电机塔架的安全可靠运行，设计
人员对格构式塔架节点的分析和处理给予了特别的
关注。格构式风力发电机塔架节点的受力机理复
杂，要得到节点的破坏形态、节点极限承载力的精确
解析解几乎是不可能的，理论分析的正确与否必须
通过试验来验证，因此进行格构式塔架节点的试验