钢管高性能混凝土短柱受力性能研究

Researches on Behavior of High-performance Concrete Filied Tubular Steel Short Columns

通过进行28根钢管高性能混凝土短柱的试验研究,探讨了影响钢管高性能混凝土短柱极限承载力的主要因素,提出了钢管高性能混凝土组合材料应力-应变关系曲线计算公式和极限强度、峰值应变、平台强度等级验计算公式,在分析国内46个试件试验结果和已有理论研究成果的基础上,建议了钢管高性能混凝土短柱极限承载力统一计算公式和相应的适用范围:D/t=20～100235/f樤s或=0.25～1.5。

Based on the experimental study of 28high-performance concrete filled t ubular steel short columns,this pap er discusses the principal factors offecting the ultimate loading capacity of high-performance concrete filled tubular steel short columns,and also presents the calculation formula for stress -str ain curves of composite material of high-performance concrete filled s teel tubes and the empirical calcula tion formulas of ultimate strength,peak strain and plateau remaining strength.In addi tion,based on analyzing the test results of 46specimens at home and the existing theoretical achievements,this pap er proposes the calculation formula for ultimate loading capacity of hig h-performance concrete filled tubular steel short columns and also suggests its approp riate range,i.e.the ratio of diameter to thickness D /t is about 20～100 235/fs or the index of confinement by steel s tirrupsis about 0.25～1.5.