钢-竹组合工字形柱轴压性能试验研究

为研究钢-竹组合工字形轴心受压构件性能,设计制作了18根工字形柱试件,以含钢率与长细比为基本参数,对其进行了轴压试验,观测了试件的破坏形态和变形特征,分析了各参数对试件轴压性能的影响规律,得到了组合柱在轴压荷载作用下的荷载-位移关系,基于钢材与竹材本构关系使用纤维模型法推演了荷载-位移全过程曲线.通过分析组合柱的屈服条...

Experimental study on axial compressive behavior of steel-bamboo I-section composite columns

To study the axial compression performance of steel-bamboo Ⅰ-section composite columns, 18 Ⅰ-section columns were designed and manufactured. Considering the basic parameters of steel ratio and slenderness ratio, axial compression tests were carried out. The failure mode and deformation characteristics of the specimens were observed, and the influence of each parameter on the axial compression performance of the specimens was analyzed. On the basis of the constitutive relationship of steel and bamboo, the whole load-displacement curves of columns under axial compression were deduced by using the fiber model method. By analyzing the yield condition of the composite column, the formula for predicting the yield bearing capacity was proposed, and the calculation method for the ultimate bearing capacity was put forward based on the superposition principle and limit equilibrium theory, then the theoretical values of the bearing capacity were compared with the experimental values. The results show that the composite columns have high integrity, good bearing capacity and deformation capacity, and the failure modes of the specimens are mainly vertical splitting of bamboo plates, degumming of bonding interface and local buckling of steel plates. The compressive bearing capacity increases with the increase of the steel ratio and decreases with the increase of the slenderness ratio. The load-displacement curves obtained from the fiber model method are in good agreement with the experimental curves, which can be applied to analyze the deformation trend of composite columns under axial compression. The relative average error between the theoretical and experimental values of yield and ultimate bearing capacity is less than 10%, which indicates that the established calculation method has high accuracy and is suitable for predicting the bearing capacity of steel-bamboo Ⅰ-section composite columns.