工字形截面型钢混凝土短柱受压性能研究

Study on behavior of I-section steel reinforced concrete column under compression load

为研究工字形截面型钢混凝土短柱的受压性能,设计了5个1/20缩尺工字形截面型钢混凝土短柱试件,各试件几何尺寸、配筋、配钢均相同,进行了不同偏心距、不同加载方向工况下的轴压、偏压单调加载试验。通过试验,分析了各试件的破坏特征、承载力、刚度及退化过程等。对比分析了偏心距、加载方向对工字形截面型钢混凝土短柱受压性能的影响规律。基于试验,进行了工字形截面型钢混凝土短柱受压承载力计算,计算结果与试验结果符合较好。研究表明:工字形截面型钢混凝土短柱具有良好的弹塑性变形能力和较高的承载力;随着偏心距的增大,工字形截面型钢混凝土短柱的承载力逐渐降低,弹塑性最大位移逐渐增大,延性逐渐增强,刚度退化逐渐减慢;偏心距相近时,与沿翼缘方向偏心加载的试件相比,沿工字形截面腹板方向加载的试件屈服荷载、极限荷载较高,延性性能较好。

To study the behavior of I-section steel reinforced concrete short column under compression load,five 1/20 scaled I-section steel reinforced concrete short column specimens with same geometry dimension,reinforcement and steel layout were tested under axial or eccentric（different eccentric direction,different eccentricity） monotonic loading.The failure characteristics,load-bearing capacity,stiffness and degradation process of the specimens were analyzed.The influence of eccentricity and eccentric direction on the compression behavior of I-section steel reinforced concrete short column pier was comparatively analyzed.The loading bearing capacity of the I-section steel reinforced concrete short columns was calculated based on the test.The calculation results were well in agreement with the experimental results.The study shows that：I-section steel reinforced concrete short column has strong elastic-plastic deformation ability and high loading bearing capacity.With the increase of eccentricity,the specimens＇ loading bearing capacity reduces gradually,maximum elastic-plastic displacement increases gradually,ductility enhances gradually,stiffness degradation gradually slows down.Compared with the specimens subjected to eccentric load along the flange direction,the specimens with same eccentricity subjected to load along the web direction have higher load bearing capacity and better ductility performance.