轻钢桁架柱轴压性能试验研究

Experimental Research on Static Behavior of Lightweight Steel Truss Columns under Axial Load

通过10根轻钢桁架柱的轴压试验,研究了不同长细比和扣板间距等参数对轻钢桁架柱轴压承载受力性能的影响。结果表明:在轴向压力作用下,轻钢桁架柱主要发生弯曲屈曲破坏,且在没有任何侧向约束条件下双管柱不适于承受竖向荷载;轻钢桁架柱的承载力随着长细比的增加而显著下降;扣板间距对轻钢桁架柱的承载力影响不大,但要符合分肢长细比的要求;轻钢桁架柱可视为缀板式格构柱,双管柱按照实腹式轴心压杆的方法计算承载力,四管柱采用换算长细比的方法计算其绕虚轴弯曲屈曲破坏的极限承载力。

Ten truss columns of lightweight steel are tested under axial compression loads. The influences of different slenderness ratio and spacing of batten plate on the static mechanics behavior of columns of lightweight steel are investigated. It is indicated truss columns of lightweight steel mainly occur bend buckling destruction under the axial pressure and battened steel column is not suitable for vertical load without any lateral restraint; The bearing capacity of truss columns of lightweight steel observably decreases with increasing slenderness ratio; Spacing of batten plate has no obvious influences on the bearing capacity oftrnss columns of lightweight steel, and according with the requirement of points limb slenderness ratio; Truss column light steel can be regarded as batten plate lattice column. Battened steel column can be according to method of the solid-web axial compressive bar to calculate beating capacity. Limbs column can be according to method of conversion slenderness ratio to calculate the ultimate bearing capacity around the imaginary axis bending buckling failure.