【作者】 杨月红； 张栋翔； 鲁锦伟； 莫琳琳； 陈宗平；

【Author】 YANG Yuehong;ZHANG Dongxiang;LU Jinwei;MO linlin;CHEN Zongping;Inner Mongolia Electric Power Science and Research Institute;College of Civil Engineering and Architecture,Guangxi University;Key Laboratory of Disaster Prevention and Structure Safety of Chinese Ministry of Education;

【机构】 内蒙古电力科学研究院； 广西大学土木建筑工程学院； 广西大学工程防灾与结构安全教育部重点实验室；

【摘要】 为了研究服役期中预应力混凝土电杆的性能及破坏机理,完成了6根预应力混凝土电杆的承载能力试验,其中3根为抗剪承载能力试验,其余3根进行抗弯承载能力试验。通过试验,观察了试件的破坏形态,并获取试验全过程的荷载-裂缝宽度曲线、荷载-挠度曲线和刚度退化曲线,并进行预应力混凝土电杆抗剪和抗弯承载能力试验的相关机制对比。结果表明:预应力混凝土电杆的抗剪、抗弯破坏形态分别表现为斜拉破坏和少筋破坏,且在正常使用极限状态设计法下,通过计算分析电杆距离破坏倒塌具有平均安全富余系数分别为1.33和1.23。研究成果可为输电线路杆塔的安全性评估提供技术依据,对保证电力系统安全稳定运行具有重要的现实意义。更多还原

【Abstract】 To investigate the performance and failure mechanism of pre-stressed concrete poles in service,six tests on the bearing capacity of pre-stressed concrete poles were completed,of which three were tested for shear bearing capacity and the other three were tested for flexural bearing capacity.The failure modes of the specimens were observed through tests,and the load-crack width curve,load-deflection curve and stiffness degradation curve were obtained during the entire test process.The shear and flexural load-carrying capacity of the pre-stressed concrete poles were compared.The results show that the shear and bending failure modes of the pre-stressed concrete poles are cablestayed failure and rare-reinforced failure,respectively.Under the normal limit state design method,the average safety redundancy coefficients of the distance failure and collapse of the poles are 1.33 and 1.23,respectively.The research results can provide the technical basis for the safety assessment of transmission line poles and towers,and have great practical significance for ensuring the safe and stable operation of the power system.更多还原