钢管塔正负偏心K形相贯节点的极限承载力研究
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摘要
现有《钢结构设计规范》公式没有明确反映偏心距对节点承载力的影响。为了考察偏心距对钢管K形相贯节点的承载力的影响规律,建立偏心钢管相贯节点有限元模型,研究偏心相贯节点的受力机理;同时分析主管轴压力、加劲肋对节点承载力的影响规律。分析结果表明:偏心节点和无偏心节点破坏模式基本相同;偏心距影响节点承载力,负偏心增大有利于提高节点的极限承载力,正偏心降低节点极限承载力;而且相对正偏心而言负偏心对极限承载力影响更大。相贯节点的承载力模拟值比规范计算值大10%～30%,即规范公式计算结果偏于保守。
In the latest Code for Design of Steel Structure,the effect of eccentricity on the bearing capacity of joints is not explicitly illustrated.In order to study the influence of eccentricity on bearing capacity of circular tubular K-joints,the finite element model of eccentric steel tubular joints is built,and the stress distribution of eccentric joint is simulated.The influence of the main chord pressure and the stiffener on the bearing capacity of the joint is also investigated.The analysis results show that the failure modes of central joint and eccentric joint are similar,and eccentric distance can affect the strengths of circular joints,meaning the negative eccentricity could increase the strength,while positive eccentricity could decrease it.Besides,the negative eccentricity has much larger influence on the strength than positive eccentricity.The calculated strength is about 10% ～30% larger than the theoretical values,and the strength calculation in code is relatively conservative.
In the latest Code for Design of Steel Structure,the effect of eccentricity on the bearing capacity of joints is not explicitly illustrated.In order to study the influence of eccentricity on bearing capacity of circular tubular K-joints,the finite element model of eccentric steel tubular joints is built,and the stress distribution of eccentric joint is simulated.The influence of the main chord pressure and the stiffener on the bearing capacity of the joint is also investigated.The analysis results show that the failure modes of central joint and eccentric joint are similar,and eccentric distance can affect the strengths of circular joints,meaning the negative eccentricity could increase the strength,while positive eccentricity could decrease it.Besides,the negative eccentricity has much larger influence on the strength than positive eccentricity.The calculated strength is about 10% ～30% larger than the theoretical values,and the strength calculation in code is relatively conservative.
引文
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[2]龚泉,肖立群.新型钢管塔的设计与应用研究[J].华东电力,2009,37(8):1265-1269.GONG Quan,XIAO Liqun.Review of the design and application of new stel pipe tower[J].East China Electric Power,2009,37(8):1265-1269.(in Chinese)
[3]朱庆科,舒宣武.平面K型钢管相贯节点极限承载力有限元分析[J].华南理工大学学报(自然科学版),2002,30(12):62-66.ZHU Qingke,SHU Xuanwu.Ultimate strength analysis of plane circular tubular K-joints by finite element method[J].Journal of South China University of Technology(Natural Science Edition),2002,30(12):62-66.(in Chinese)
[4]刘丽敏,邓洪洲,傅俊涛.钢管塔相贯焊接节点的极限承载力研究[J].浙江建筑,2006,23(11):26-28.DOI:10.15874/j.cnki.cn33-1102/tu.2006.11.009.LIU Limin,DENG Hongzhou,FU Juntao.Study on ultimate bearing capacity of intersecting welded joint of steel tube tower[J].Zhejiang Construction,2006,23(11):26-28.DOI:10.15874/j.cnki.cn33-1102/tu.2006.11.009.(in Chinese)
[5]高翔,邹相国,王勇.输电钢管塔相贯节点非线性分析[J].机械设计,2009,26(9):70-72.DOI:10.13841/j.cnki.jxsj.2009.09.015.GAO Xiang,ZOU Xiangguo,WANG Yong.Nonlinear analysis on intersection node of the steel pipe tower of power transmission[J].Journal of Machine Design,2009,26(9):70-72.DOI:10.13841/j.cnki.jxsj.2009.09.015.(in Chinese)
[6] KUROBANE Y, MAKINO Y. Ultimate resistance of unstiffened tubular joints[J].Journal of Structural Enigieering,1984,110(2):385-400.
[7] SOH C K,CHAN T K,YU S K.Limit analysis of ultimate strength of tubular X-joints[J].Journal of Structural Engineering,2000,126(7):790-797.DOI:10.1061/(ASCE)0733-9445(2000)126:7(790).
[8]曾攀,雷丽萍,方刚.基于ANSYS平台有限元分析手册:结构的建模与分析[M]北京:机械工业出版社,2011.ZENG Pan,LEI Liping,FANG Gang.Finite element analysis guide modeling and analysis of structure[M].Beijing:China Machine Press,2011.(in Chinese)
[9]中华人民共和国住房和城乡建设部.钢结构设计规范:GB50017—2017[S].北京:中国计划出版社,2017.Ministry of Housing and Urban-Rural Development of the People’s Republic of China.Code for Design of Steel Structures:GB 50017—2017[S].Beijing:China Planning Press,2017.(in Chinese)
[10]梅亮,黄炳生,邵启俊,等.K型足尺相贯节点极限承载力试验研究[J].南京工业大学学报(自然科学版),2016,38(1):96-102.DOI:10.3969/j.issn.1671-7627.2016.01.016.MEI Liang,HUANG Bingsheng,SHAO Qijun,et al.Fullscale experiment on ultimate load capacity for K-joints[J].Journal of Nanjing Tech University(Natural Science Edition),2016,38(1):96-102.DOI:10.3969/j.issn.1671-7627.2016.01.016.(in Chinese)
[11] YURA J,ZETTLEMOYER N A,EDWARDS I F.Ultimate capacity equations for tubular joints[C]//Proceedings of the Annual Offshore Technology Conference.U.S.A.,Houston,1980:113-126.