摘要
为研究钢管混凝土短柱在压、弯作用下的受剪承载力,设计了26个钢管混凝土短柱试件进行试验研究。通过对试件的破坏形态、剪力-应变曲线、剪力-跨中挠度曲线等试验结果的分析以及与已有钢管混凝土短柱在轴压力作用下的受剪承载力的对比,分析了影响钢管混凝土短柱受剪承载力的各种因素,为研究钢管混凝土短柱在轴压力以及弯矩作用下的受剪性能提供了直接的试验依据。试验结果表明,试件(剪跨比λ<0.5)的破坏均为剪切型破坏,但延性较好,有较大的变形能力。钢管混凝土短柱的受剪承载力与轴压比、剪跨比、初始弯矩有关,初始弯矩的存在对试件的受剪承载力有一定程度的削弱。基于受剪承载力机理的分析及试验的实测数据,建立了钢管混凝土短柱在压、弯作用下的受剪承载力计算公式,公式计算值与试验值符合较好,且计算结果偏于安全。
In order to study the shear capacity of concrete-filled steel tube stub columns subject to compressive and bending forces, 26 specimens were designed for experiment. Based on the analysis of failure modes, shear load-strain curves, shear load-midspan deflection curves, as well as the shear capacity compared to that of the specimens subject to axial compression, various factors influencing the shear capacity of the stub columns were studied. Therefore, the direct experimental basis for shear capacity of the stub columns subject to compressive and bending forces are provided. The experiment result shows that, the failure mode of the specimens with λ〈 0. 5 is always a shearing failure, yet with good ductility. The shear capacity of the stub columns is affected by the axial compression ratio, shear span ratio and initial eccentricity, furthermore, the shear capacity can be weakened by the initial eccentricity. Based on the analysis of shear capacity mechanism and experimental results, a formula for calculating the shear capacity of the stub columns subject to compressive and bending forces was derived. The comparison between calculated and experimental shear capacity values shows good agreement and the calculated results are at the safer side.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2010年第8期36-44,共9页
Journal of Building Structures
基金
广州市建筑科学技术委员会基金项目(2003(01))
关键词
钢管混凝土短柱
受剪承载力
试验研究
受剪承载力计算公式
concrete-filled steel tube stub columns
shear capacity
experimental study
calculating formula of shear capacity
