摘要
非对称交叉支撑杆系常见于输电铁塔。分析时将其简化为一个含弹性支座的梁,获得了相应的弹性屈曲精确解,该解适用于多种边界条件。对于弹性支座刚度趋于无穷时,则简化后的体系变成了连续梁,对此给出了相应的稳定特征方程,推导了轴力作用下的杆件刚度的显式精确解,对非对称交叉支撑杆系的弹性屈曲临界荷载进行了数值分析,所提出的经验算式的计算结果与理论值相吻合。因此,无论支撑杆受拉或受压,均可用同一方程描述。
Non-symmetric cross-bracing system is a common structure in transmission towers. It could be simplified as a beam with an intermediate elastic support. The corresponding exact solution of buckling was obtained,which was suitable for various boundary conditions. The simplified system became a continuous beam when the stiffness of the elastic support was infinite. The corresponding characteristic equation of buckling was also presented. An exact formulation was derived to calculate the lateral stiffness of axial-loaded beam. The numerical analysis of buckling of non-symmetric cross-bracing systems was then conducted. The results obtained from empirical equation agreed well with theoretical results. The results showed that both tension bracing members and compression bracing members could be described by the same equation.
出处
《工业建筑》
CSCD
北大核心
2017年第6期131-137,173,共8页
Industrial Construction
基金
国网浙江省电力公司科技项目(ZBGW14-017-051-1
5211UZ1400AW)
关键词
非对称交叉支撑杆系
输电铁塔
弹性屈曲临界荷载
精确解
经验公式
工程设计
non-symmetric cross-bracing system
transmission tower
critical elastic-buckling loading
exact solution
empirical equation
engineering design
