输电塔角钢并联加固构件承载力试验研究及理论分析  

Experimental research and theoretical analysis on bearing capacity of parallel reinforced components of angle steel for transmission towers

作　　者：章东鸿 刘向宏 王嘉琪 黎景辉 孙清[2] 田建渊 ZHANG Donghong;LIU Xianghong;WANG Jiaqi;LI Jinghui;SUN Qing;TIAN Jianyuan(China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.,Guangzhou 510663,Guangdong,China;School of Human Settlements and Civil Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China;Shaanxi Yinhe Power Tower Co.,Ltd,Xi’an 710608,Shannxi,China)

机构地区：[1]中国能源建设集团广东省电力设计研究院有限公司,广东广州510663 [2]西安交通大学人居环境与建筑工程学院,陕西西安710049 [3]陕西银河电力杆塔有限责任公司,陕西西安710608

出　　处：《建筑科学与工程学报》2024年第5期102-112,共11页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51978570)。

摘　　要：为满足输电结构持久安全运行,在不破坏原有角钢截面造成截面削弱的前提下,提出了2种基于构件并联的无损加固措施;通过未加固、加固角钢轴压试验和有限元仿真计算,得到了各试件的荷载-位移曲线与荷载-竖向应变曲线,分析了试件的破坏机制与加固机理并基于参数分析明晰了角钢强度、抱箍连接件数量、抱箍连接件长度、构件长细比等因素对承载力的影响;基于弯曲、扭转、弯扭屈曲临界力计算方法提出了基于构件并联的修正承载力计算公式,并验证了修正承载力计算公式的有效性。结果表明:未加固角钢易发生弯扭失稳破坏,加固方案通过增大截面抗弯刚度和改变组合构件的失稳形态,提高了极限承载力并改善了失稳后的刚度与变形性能;有限元模型可有效反映构件破坏形式,主材角钢强度提高能增强承载力但对变形能力无影响,抱箍连接件对加固后性能无明显影响,长细比与加固效率呈正相关;推导的弯扭失稳临界力计算理论便于计算加固构件极限承载力,有利于推广无损并联加固措施。In order to meet the long-term safe operation of the transmission structure,two non-destructive parallel reinforcement measures based on the parallel reinforced components were proposed without destroying the original angel steel section and weakening the section.Through the axial compression test of single angle steel and reinforced angle steel and the finite element analysis,the load-displacement curve and load-vertical strain curve of each specimen were obtained.The failure mechanism and reinforcement mechanism of the specimen were analyzed,and the influence of the angle steel strength,the number of hoop connectors,the length of the hoop connectors,and the slenderness ratio of the members on the bearing capacity of the reinforcement members were clarified based on the parameter analysis.Based on the calculation method of bending,torsion,and bending-torsional buckling,the formula of bearing capacity based on parallel reinforcement were proposed,and the validity of the theoretical formula was verified.The results show that the unreinforced angle steel is prone to bending and torsional instability failure.By increasing the bending stiffness of the section and altering the instability mode of the composite members,the reinforcement schemes can enhance the ultimate bearing capacity and improve the stiffness and deformation performance after instability.The finite element model can effectively reflect the failure mode of the members.Increasing the strength of the main angle steel enhances the bearing capacity but has no effect on the deformation capacity.The clamping connectors have no significant impact on the performance after reinforcement,and there is a positive correlation between the slenderness ratio and the reinforcement efficiency.The derived calculation theory for the critical force of bending and torsional instability facilitates the calculation of the ultimate bearing capacity of the reinforced members,which is conducive to promoting the application of non-destructive parallel reinforcement measures.

关 键 词：输电塔 角钢 无损加固 轴压试验 数值模拟 承载力计算方法 

分 类 号：TU391[建筑科学—结构工程]