GFRP输电塔T形节点抗弯承载力  

Flexural bearing capacity of T-shaped joints in GFRP transmission towers

作　　者：陈勇[1] 许金一 谢芳 冯炳 王慧敏 沈国辉[1] CHEN Yong;XU Jinyi;XIE Fang;FENG Bing;WANG Huimin;SHEN Guohui(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;School of Civil Engineering,Shaoxing University,Shaoxing 312000,China;Shaoxing Daming Electric Power Design Institute CO.,LTD.,Shaoxing 312099,China;Hangzhou Yunqi Commercial Group CO.,LTD.,Hangzhou 310007,China)

机构地区：[1]浙江大学建筑工程学院,杭州310058 [2]绍兴文理学院土木工程学院,绍兴312000 [3]绍兴大明电力设计院有限公司,绍兴312099 [4]杭州云起商用集团有限公司,杭州310007

出　　处：《复合材料学报》2024年第5期2609-2622,共14页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51878607;51838012);国网浙江省电力公司集体企业科技项目(SX-JT-KJ-2018-01);浙江省自然科学基金青年项目(LQ17E080010)。

摘　　要：整体成型的玻璃纤维增强复合材料(Glass fiber reinforced polymer,GFRP)节点是GFRP输电塔挂线模块的关键结构部件,需开展其承载力研究。首先对两个典型节点进行了试验研究,获得了包括荷载位移曲线、破坏模式的力学性能,然后建立基于渐进损伤演化的有限元模型,利用该模型开展了抗弯承载力关于垂直纤维方向抗拉强度Yt和剪切强度SL比值、主管直径D与厚度T比值、节点横梁宽度B及厚度w等参数的敏感性分析,基于Hashin失效准则和回归分析推演了该节点抗弯承载力算式并进行了可靠度分析。结果表明:试验和有限元计算结果具有较好的一致性,主要破坏形式为节点附近GFRP主管的基体拉伸破坏,当Y_(t)/S_(L)增大时破坏位置从节点向主管中部迁移,承载力随之下降。承载力算式结果与有限元计算结果比值的均值和变异系数分别为1.032和6.80%,承载力设计值具有99.9%的保证率。The integrally formed glass fiber reinforced polymer(GFRP)connection is the key structural component of the transmission tower's GFRP line-suspension module,requiring investigation into its capacities.Initially,two typical connections were examined experimentally,yielding mechanical properties including load-displacement curves and failure modes.Subsequently,a finite element model based on progressive damage evolution was established.Using the experimentally validated model,sensitivity analyses on the flexural capacity in relation to parameters such as the ratio of tensile strength Y in the direction of the fiber to shear strength SL,the ratio of main tube diameter D to thickness T,the connection beam width B,and thickness w were conducted.Based on Hashin's failure criterion and regression analysis,an approximating equation for the connection's flexural capacity was derived,followed by a reliability analysis.The results indicate a good consistency between the experimental and the finite element analysis(FEA)results.The primary failure mode is the tension fracture of the matrix of the GFRP main tube near the connection.With increasing Y_(t)/S_(L),the location of failure moves from the connection to the middle of the main tube gradually,showing a corresponding decrease in load-bearing capacity.The mean value and the coefficient of variation of the ratio of approximated capacity to FEA result are 1.032 and 6.80%respectively,and the flexural capacity derived for design has an assurance rate of 99.9%.

关 键 词：GFRP节点 力学性能 试验研究 抗弯承载力 计算式 

分 类 号：TB332[一般工业技术—材料科学与工程] TM753[电气工程—电力系统及自动化]