摘要
对钢管混凝土T形柱进行合理的改进,提出多室式钢管混凝土T形柱(MT-CFST柱)。进行12个短柱试件的轴压试验并对其破坏过程作了详细描述,给出试件的轴压应力-纵向平均应变曲线,同时也考察试件的破坏形态及截面各尺寸、板件布置方式、钢板厚度、混凝土强度等因素对试件力学性能的影响。试验结果表明:多室式钢管混凝土T形柱能较好地增强T形截面内钢材对混凝土的约束作用,发挥两种材料的组合性能;试件的破坏以局部鼓曲和整体剪切两种形式为主,轴压性能受腹板高度、钢板厚度及混凝土强度的影响较大。同时,参考国内外4种钢管混凝土规范中的计算方法对试件的承载力进行计算,经过对比后发现,按EC4规范计算的结果与试验结果符合最好。
Multi-cell T-shaped concrete-filled steel tubular （MT-CFST） column is an improvement of T-shaped concretefilled steel tubular （T-CFST） column. Twelve MT-CFST stub columns under axial compression were tested and the failure processes were described in detail. The axial stress-longitudinal average strain curves were provided, and the effects of the factors including cross section dimension, steel plate layout, thickness of the steel plate and concrete strength on the mechanical behaviors of the specimens were discussed. It is shown that MT-CFST stub columns may enhance the interaction between the two component materials and take advantage of their performances. The primary failure modes of the specimens involved local bulge failure and shear failure. Properties of the MT-CFST columns are mainly influenced by the web length, steel plate thickness and the concrete strength. The axial load capacities of the specimens were calculated according to four design codes for CFST columns. The comparison between the calculations and experimental data indicates that the EC4 method provides much better estimate of the bearing capacity of MT-CFST columns.
出处
《土木工程学报》
EI
CSCD
北大核心
2011年第10期9-16,共8页
China Civil Engineering Journal
关键词
钢管混凝土T形柱
多室式
轴心受压
破坏形态
承载力
T-shaped concrete-filled steel tubular column
multi-cell
axial compression
failure mode
bearing capacity
