【作者】 杨月红； 孙常明； 刘晓明； 廖浩宇； 陈宗平；

【Author】 YANG Yuehong;SUN Changming;LIU Xiaoming;LIAO Haoyu;CHEN Zongping;Inner Mongolia Electric Power Science and Research Institute;Inner Mongolia Power(Group) Co.,Ltd.;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； 内蒙古电力(集团)有限责任公司； 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】 为了揭示在役预应力混凝土电杆接头的受力性能及破坏机理,本文通过观察从现场随机抽取的3根预应力混凝土电杆接头的抗弯加载试验,获取其破坏形态、开裂荷载、正常使用状态极限荷载、承载能力状态极限荷载等重要试验数据,且基于试验实测数据,对钢圈接头应变,裂缝宽度,跨中挠度,刚度损伤及耗能等进行了研究,并提出了刚度退化的数学表达式。试验结果表明:3根预应力混凝土电杆接头的破坏形态均属于"少筋梁"的破坏,表现为混凝土被拉裂,接头钢圈不屈服的脆性现象;接头钢圈的应变大致符合平截面假定;基于正常使用极限状态设计法,电杆距离倒塌破坏平均具有1.2的安全富余系数;电杆接头的损伤程度随跨中挠度的增加而呈先快后慢的趋势,实际耗能随着裂缝开展而增大。更多还原

【Abstract】 In order to reveal the mechanical behavior and failure mechanism of in-service prestressed concrete pole joints,this paper observed the bending loading test of three prestressed concrete pole joints randomly selected from the site to obtain the failure mode,cracking load and normal use.Based on the experimental data,the strain of the steel ring joint,the crack width,the mid-span deflection,the stiffness,the damage and the energy dissipation were studied,and the mathematical expression of the stiffness degradation was proposed.The test results show that the failure modes of the three prestressed concrete pole joints belong to the form of under-reinforced beams,which is characterized by the fact that the concrete is cracked and the joint steel ring does not yield brittleness.The strain of joint steel rings roughly meets the plane hypothesis.Based on the serviceability limit states,The average safety redundancy factor of pole distance collapse failure is 1.2.The degree of damage of the pole joints tends to be faster and slower with the increase of the mid-span deflection;and the energy dissipation of pole joints increases as the cracks develop.更多还原