输电塔半刚性连接钢管构件轴压稳定性能研究
STUDY ON AXIAL COMPRESSION STABILITY BEHAVIOR OF STEEL TUBULAR MEMBER WITH SEMI-RIGID CONNECTIONS IN TRANSMISSION TOWERS
李正良 1唐正奇 1杨靖波 2俞登科 2冯衡 3郭莹1
作者信息
- 1. 重庆大学土木工程学院,重庆 400045
- 2. 电力规划总院有限公司,北京 100120
- 3. 中南电力设计院有限公司,武汉 430071
- 折叠
摘要
为了研究输电塔半刚性连接钢管构件的轴压稳定性能,对 60根钢管试件进行了轴压试验,分析了其失稳破坏模式和稳定承载力,并与现行设计规范计算的承载力进行了对比;建立了半刚性连接钢管构件的有限元模型,经与试验结果对比验证后开展了参数分析,研究了初始转动刚度、径厚比、材料强度以及初始缺陷对半刚性连接钢管构件的稳定系数-长细比曲线的影响;基于有限元分析的结果提出了半刚性连接钢管构件的轴压稳定计算公式.研究结果表明:半刚性连接构件的试验稳定承载力均大于铰接构件的试验稳定承载力,在所有试验工况中两者的相对差距最小为 5.6%;中国和美国现行设计规范计算得到的钢管构件稳定承载力总体偏保守,分别约为试验结果的 0.78倍和 0.89倍;影响半刚性连接钢管构件稳定承载力的主要因素为长细比、初始转动刚度以及边界条件;提出的半刚性连接钢管构件轴压稳定计算公式能准确地预测其稳定系数并具有良好的适用性,可为实际工程提供参考.
Abstract
To study the axial compression stability behavior of steel tubular members with semi-rigid connections in transmission towers,the axial compression test of 60 steel tubular members was firstly conducted,in which the failure mode was analyzed and the stability bearing capacity was compared with calculated results of existing design codes.The finite element(FE)model of steel tubular members with semi-rigid connections was established.After the validation with experimental results,the parametric analysis was carried out,and the investigated are the effect of initial rotational stiffness,diameter-thickness ratio,yield strength and initial imperfection on the stability coefficient-slenderness ratio curve.One stability design formula for steel tubular members with semi-rigid connections was proposed upon FE analysis results.The results show that:the experimental stability bearing capacity of steel tubular members with semi-rigid connections is larger than that with pinned connections,in which the minimum relative error is 5.6%in all experiment cases.The stability bearing capacity calculated by Chinese and American existing design codes exhibits overall conservatism,in which the calculated results are respectively 0.78 and 0.89 times of experimental results.The main factors which affect the stability bearing capacity of steel tubular members with semi-rigid connections are the slenderness ratio,initial rotational stiffness and,boundary condition.The formula proposed could accurately predict the stability coefficient with good applicability,which can provide a reference for actual associated engineering.
关键词
输电塔/钢管构件/半刚性连接/轴压试验/稳定承载力/有限元分析Key words
transmission tower/steel tubular member/semi-rigid connection/axial compression test/stability bearing capacity/finite element analysis引用本文复制引用
出版年
2025
NETL
NSTL
万方数据