空冷支架混凝土管柱抗扭性能影响因素

Influence Factors of Torsion Performance of Air Condenser Support Concrete Pipe Column

为了研究空冷支架混凝土管柱在压弯剪扭作用下抗扭性能的影响因素及其规律,对现有空冷支架混凝土管柱抗扭性能进行了研究.建立了有限元模型,应用已有试验结果进行了验证,分析研究了壁径比、箍筋配筋率、混凝土强度、纵筋配筋率和长细比对混凝土管柱构件在复合受力情况下抗扭性能的影响,并运用响应曲面法研究了以上 5 种影响因素的显著性及交互作用.结果表明:混凝土管柱的抗扭承载力会随着壁径比、混凝土强度以及纵筋配筋率的增大而增大,其抗扭延性会随着壁径比和纵筋配筋率的提高而增加;5 种因素的单因素反应均显著,其中长细比的影响最显著;壁径比和混凝土强度等级、壁径比和长细比,以及混凝土强度等级和长细比的交互作用最明显.最后,针对混凝土管柱设计所要考虑的关键因素提出了建议.

To study the influencing factors and regularities of the torsional behavior of air-cooled concrete pipe columns under the press-bending-shear-torsion action, the torsional behavior of existing air-cold concrete tubular columns was studied in this paper. The finite element model was established and verified by the existing test results, The effects of wall-to-diameter ratio, stirrup reinforcement ratio, concrete strength, longitudinal reinforcement ratio and slenderness ratio on the torsional behavior of concrete tubular members under the press-bending-shear-torsion action were analyzed, and the response surface method was used to study the significance and interaction of the above five influencing factors. It is found that the torsional bearing capacity of concrete pipe string increases with the increase of wall diameter ratio, and concrete strength and longitudinal reinforcement ratio, and the torsional ductility increases with the increase of the wall diameter ratio and the longitudinal reinforcement ratio. The all single factor reactions are significant, the effect of slenderness ratio is the most significant. The interactions between wall diameter ratio and concrete strength, wall diameter ratio and slenderness ratio, and concrete strength and slenderness ratio are the most obvious. Finally, this paper suggested the important factors that need to be considered in the design of concrete pipe column.