钢-竹组合工字形柱轴压性能试验研究  

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

作　　者：张家亮 茅鸣[2] 俞斌武 王建民 李玉顺[1] ZHANG Jialiang;MAO Ming;YU Binwu;WANG Jianmin;LI Yushun(College of Civil Engineering and Architecture,Qingdao Agricultural University,Qingdao 266109,China;School of Civil and Environmental Engineering,Ningbo University,Ningbo 315211,China)

机构地区：[1]青岛农业大学建筑工程学院,山东青岛266109 [2]宁波大学土木与环境工程学院,浙江宁波315211

出　　处：《建筑结构学报》2022年第2期105-115,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(51678310,51978345);浙江省自然科学基金项目(LQ19E080007);宁波市自然科学基金项目(2018A610349)。

摘　　要：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件推导了组合柱屈服荷载计算式,基于叠加原理和极限平衡理论提出了承载力计算方法,并将承载力计算值与试验值进行了对比分析。结果表明:钢-竹组合工字形柱整体性高,具有良好的承载能力和变形能力;试件的破坏形态主要表现为竹板竖向劈裂、胶合面脱胶及薄壁型钢局部屈曲;轴心受压承载力随含钢率的增大而显著提高,随长细比的增大而降低;由纤维模型法绘制的荷载-位移计算曲线与试验曲线表现出较高的吻合度,可用于分析钢-竹组合柱轴压荷载作用下变形发展趋势;屈服荷载与极限荷载计算值与试验值平均相对误差均小于10%,说明建立的计算模型具有较高的精度,适用于预测钢-竹组合工字形柱承载力。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.

关 键 词：钢-竹组合工字形柱 轴心受压试验 纤维模型法 极限平衡理论 承载力 

分 类 号：TU398.9[建筑科学—结构工程]