特高压输电塔不等边角钢交叉斜材的承载力  

Study on the Stability Bearing Capacity of Unequal Angle Cross Bracing of Ultra-high Voltage Transmission Tower

作　　者：张毅[1,2] 李正良[1] 刘红军[1] 刘蜀宇 ZHANG Yi;LI Zhengliang;LIU Hongjun;LIU Shuyu(College of Civil Engineering,Chongqing University,Chongqing 400045,China;School of Civil and Architectural Engineering,Gulin University of Technology,Guilin 541004,Guangxi,China;Chongqing Shuntai Tower Manufacturing Co.,LTD,Chongqing 400026,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]桂林理工大学土木与建筑工程学院,广西桂林541004 [3]重庆顺泰铁塔制造有限公司,重庆400026

出　　处：《华南理工大学学报（自然科学版）》2019年第7期19-31,共13页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51508054);重庆市基础与前沿研究计划项目(cstc2015jcyjA00041)~~

摘　　要：为研究不等边角钢作为特高压输电塔交叉斜材的承载性能,选用了我国特高压输电塔结构中典型的节间形式,制作了交叉斜材采用不等边角钢的足尺节间试件,进行了节间不同工况下的静力加载试验,研究了不等边角钢交叉斜材的应变发展、变形特征、破坏模式及极限承载力;然后,建立了节间的非线性有限元模型,并进行了试验验证和参数分析.试验结果表明,不同工况加载过程中,不等边角钢交叉斜材的稳定承载性能良好,极限荷载作用下,不等边角钢交叉斜材的受力方式决定其最终的破坏模式为面外屈曲或面外和面内共同屈曲;有限元模型参数分析表明,随着交叉斜材内力比值的降低、材料强度等级的提高以及斜材相交点位置的提高,不等边角钢交叉斜材的承载力均有所提高,交叉斜材的受力方式对其承载力提高的效果有显著影响.最后,基于能量法及有限单元法,提出了不等边角钢交叉斜材承载力计算的理论方法,经验证,理论方法的计算结果与有限元分析结果、试验结果吻合较好.The mechanical properties of unequal angle cross bracing of ultra-high voltage(UHV)transmission tower were studied.Two full-scale internodes adopting unequal angle cross bracing,used commonly in UHV transmission tower in China,were made and carried on the static test under different working conditions.The strain development,the characteristics of deformation,the failure mode and the ultimate bearing capacity of the unequal angle cross bracing were mainly studied;then the nonlinear finite element analytical(FEA)model of internodes were established and verified by test.The parameters of FEA model of internodes were analyzed.The test results show that the bearing capacity of unequal angle cross bracing is good in different working conditions loading,when the load reaches the limit value,the failure mode of the unequal angle cross bracing was determined by loading mode to be out-of-plane buckling or out-of-plane and in-plane buckling.The parameter analysis shows that the bearing capacity of cross bracing is improved with the decrease of the internal force ratio,the increase of material strength and the increase of the intersection position.The improvement of bearing capacity of cross bracing is significantly affected by loading mode.Finally,based on the energy method and the finite element method,the theoretical method of bearing capacity of unequal angle cross bracing were provided.It turns out that the theoretical results are in good agreement with the results of test and FEA.

关 键 词：不等边角钢 交叉斜材 特高压输电塔 承载力 能量法 有限单元法 

分 类 号：TU392.1[建筑科学—结构工程]