Investigation into Effect of Steel Strength on Buckling Strength of Prestressed Stayed Steel Columns

Ce LIANG; Yu-er YANG; Ke QIAO; Jun YUAN

doi:10.13718/j.cnki.xsxb.2019.04.018

The load carrying capacities of axial compressed steel columns can be significantly enhanced by introducing stays and crossarms. In this current work, ABAQUS has been adopted to analyze the stability behavior of prestressed stayed steel columns using linear and nonlinear buckling analysis. The effects of steel strength of the capacities of prestressed stayed column with different crossarm length and stay diameters have been investigated. It has been demonstrated that the effect of steel strength can be ignored when the buckling mode is symmetric, however, the load carrying capacity can be considerably improved by steel strength when the buckling mode is anti-symmetric.

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预应力撑杆钢柱是通过在细长受压钢柱中引入撑杆和预应力索，来提高其稳定承载能力的钢结构构件.对拉索施加预应力后，撑杆会对中心柱形成侧向支撑，从而减小中心柱的计算长度，以提升其稳定性能^[1].由于稳定性好、造型美观、用料节省，预应力撑杆钢柱在国内外的工程实践中得到广泛地应用.

自上世纪70年代以来，国内外学者对预应力撑杆钢柱展开了大量的研究.文献[2]对预应力撑杆钢柱的屈曲荷载进行了研究，分析表明，预应力撑杆钢柱在仅沿柱高布置一层撑杆的情况下，其屈曲荷载可以达到相应普通受压钢柱欧拉荷载的7倍以上.文献[3]推导了单层预应力撑杆钢柱屈曲荷载和拉索初始预张力的关系.文献[4]对沿柱高设置多层撑杆的预应力撑杆钢柱进行了研究，其研究表明，增加撑杆层数可以提升此类构件的屈曲荷载，但也使得其屈曲模态更加复杂.文献[5]研究了初始几何缺陷对预应力撑杆钢柱承载能力的影响.文献[6-7]研究发现，预应力撑杆钢柱不同阶屈曲荷载可能相当接近，并会发生不同屈曲模态之间相互影响的相关屈曲现象.文献[8]对设置双层撑杆的预应力撑杆钢柱相关屈曲展开了研究，结果表明此类双层撑杆结构可忽略相关屈曲影响.文献[9-10]对高性能钢材的单层预应力撑杆钢柱展开了研究，发现提高钢材强度后，预应力撑杆钢柱的稳定承载能力有所提高，但是这项研究仅是针对沿着柱高设置一层撑杆的情形展开的，且并未考虑撑杆长度、拉索直径和屈曲模态的影响.

本文以设置双层撑杆的预应力撑杆钢柱为研究对象，通过有限元软件ABAQUS进行数值分析，重点考察采用不同强度等级的钢材时，预应力撑杆钢柱的稳定性能，并分析其影响因素.

3. 结论

1) 结构的屈曲模态决定了钢材强度与结构承载性能之间的关系，当结构发生对称屈曲时，提升钢材强度对结构稳定承载力并没有显著影响；当结构发生反对称屈曲时，钢材强度的提升使得结构承载性能明显增强.

2) 不同的撑杆长度和拉索直径，可能对结构的屈曲模态和承载性能产生显著影响.当撑杆长度或者拉索直径较小时，预应力撑杆钢柱呈现出对称屈曲模态，反之则为反对称屈曲模态；增大拉索直径，或当结构发生对称屈曲时增加撑杆长度，均可以有效地提升结构的承载性能.

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Investigation into Effect of Steel Strength on Buckling Strength of Prestressed Stayed Steel Columns

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