圆形断面波形钢腹板支架结构稳定承载性能研究

Stability capacity of circular steel supporting structure with corrugated webs

为研究一种新型波形钢腹板支架结构的承载性能,开展2榀圆形波形钢腹板支架的模型试验和1榀与波形钢腹板用钢量相同的矿用工字钢支架的模型试验,分析支架的稳定承载力、刚度和变形发展情况。试验结果表明:圆形支架试验模型的最终破坏形式为整体失稳破坏,腹板高度增加时对其承载力有明显提高;波形钢腹板支架的单位质量承载能力是用钢量基本相等的矿用工字钢支架的1.49倍,同时变形仅为后者的5/7,波形钢腹板支架的承载力更高、支护效果更好。基于有限元模型,分析截面参数变化对波形钢腹板支架的弹塑性整体稳定性的影响,结果表明翼缘宽度和翼缘厚度是其稳定承载力的敏感参数。

In order to investigate the stability of a new circular steel supporting structure with corrugated webs,laboratory tests have been carried out to study two full-scale circular steel supporting structures with corrugated webs and one conventional I-shaped section steel arch.The stability capacity,stiffness and the deformation of the supports has been analyzed.Test results have demonstrated that global buckling occurs in the new structure,and its load-carrying capacity increases with the increase of the height of the webs.Moreover,comparisons have revealed that the critical buckling load of the new steel supporting structure with corrugated webs is 1.49 times that of the conventional steel supporting structure,whereas,its deformation is only 5/7 that of the latter,indicating that the new structure is more effective as bracing.In addition,the influence of a parametric change in terms of cross section on the elastoplastic stability has been analyzed through finite element model analysis.The findings have shown that the width and the thickness of flange of the steel supporting structure with corrugated webs are two critical variables in their stability capacity.