轴心受压预应力斜撑杆钢柱承载能力研究

预应力撑杆钢柱具有承载性能好、稳定性强、用料节省等优点,在现代钢结构工程中得到了越来越广泛的应用.以轴心受压的斜撑杆预应力钢柱为研究对象,通过ABAQUS软件进行线性与非线性屈曲分析,研究了撑杆长度、拉索直径、斜撑杆与水平方向倾角、初始缺陷、支座约束条件等多种因素对这类预应力撑杆柱承载能力的影响.研究表明,撑杆长度、拉索直径、斜撑杆倾角均会影响预应力斜撑杆钢柱的承载能力;缺陷敏感性和预应力敏感度分析还表明,预应力斜撑杆钢柱是一类缺陷敏感型构件,过大地增大初始拉索预应力并不会显著提高其承载能力.

Buckling Capacity Analysis of Axially Compressed Prestressed Stayed Steel Columns with Split-up Crossarm Systems

The prestressed stayed steel column has the advantages of good bearing performance, strong stability and material saving, and has been widely used in modern steel structure engineering. In this paper, the axially compressed prestressed stayed steel columns has been taken as the research object, and the linear and nonlinear buckling analysis been carried out by ABAQUS software. The effects of various factors such as the length of the crossarm, the diameter of the stay, the angle between the split-up crossarm and the horizontal direction, the initial imperfections and the bearing constraints on the bearing capacity of the prestressed stayed steel column have been investigated. The research in this paper shows that the length of the crossarm, the diameter of the stay, the angle between the split-up crossarm and the horizontal direction will affect the bearing capacity of the prestressed stayed steel column with split-up crossarm. In addition, the imperfection sensitivity and initial pretension sensitivity analysis of this paper also show that the prestressed stayed steel column with split-up crossarm is a kind of imperfection-sensitive component. Excessively increasing the initial stay pretension does not significantly improve its bearing capacity.