波形钢板钢管混凝土柱试验研究

Experimental research on concrete filled steel tubular columns with corrugated steel webs

进行了以长细比和偏心率为参数的共22根波形钢板钢管混凝土柱的试验。对试件的荷载-挠度曲线、极限承载力、柱肢钢管和波形钢板的应变等进行了分析。试验结果表明,波形钢板钢管混凝土柱的受力性能与钢管混凝土格构柱相近,随着长细比与偏心率的增大,波形钢板钢管混凝土柱的极限承载力显著降低,而长细比和偏心率对其极限承载力的影响基本上是相互独立的,可采用双系数乘积公式计算。波形钢板钢管混凝土柱应考虑剪切变形对极限承载力及挠曲变形的影响,但由于波形钢板抗剪刚度要大于钢管混凝土格构柱的缀管,因而其剪切变形所引起的附加挠度对极限承载力的降低影响较钢管混凝土格构柱小。在实腹式截面杆件稳定荷载计算的基础上,提出了考虑剪切变形影响的波形钢板钢管混凝土柱稳定系数的计算方法。

A total of 22 concrete filled steel tubular （CFST） columns with corrugated steel webs were tested, taking slenderness ratio and eccentricity ratio as key parameters. Load-deflection curves, strains in tubes and corrugated webs of the specimens are analyzed. Test results show that the mechanical behavior of CFST columns with corrugated steel webs is similar with that of CFST laced columns. The ultimate load is decreased with the increase of slenderness ratio and eccentric ratio, and the influence of slenderness ratio and eccentricity ratio on the ultimate load-carrying capacity is independent, product of the two reduction factors due to them can be applied to take the effect of them into consideration in the calculation of load-carrying capacity. The influence of shear deformation on the ultimate load- carrying capacity of CFST columns with corrugated steel webs should be considered. However, the shear deformation in CFST columns with corrugated web is smaller than that in CFST laced columns due to the higher shearing resistance of corrugated steel web. Based on calculation method for the critical load of columns with solid section, the method for the calculation of stability factor for CFST columns with corrugated webs is proposed.