外套钢管加固受损钢管混凝土短柱轴压试验研究

Experimental study of axial compression on the damaged concrete filled steel tubular short column strengthened by outerwear steel pipe

为了研究受损钢管混凝土短柱加固前后的力学性能，对13根采用外套钢管加固的受损钢管混凝土短柱进行试验研究．试验通过改变试件损伤率、外套钢管壁厚等变化参数，考察试件破坏形态以及变形情况，进而分析这些参数对加固前后受损钢管混凝土试件的影响．结果表明：当损伤率小于10％时，外套钢管对试件承载力的影响不大，只是在后期延性方面影响较大；随着外套钢管壁厚的增大，加固试件承载力是受损试件承载力的1．9～2．5倍．

In order to study the mechanics performance of the damaged concrete filled steel tubular short col-umn before and after the reinforcement,thirteen damaged concrete filled steel tubular short column strength-ened by outerwear steel pipe were designed for the axial compressive experiment research.During the test we changed the damaged rate,outer pipe wall thickness to observe the failure modes and deformation to analyze the impact of these factors on the damaged specimens before and after reinforcement.The results show that：when the damage rate is less than 10%,there has little effect on the carrying capacity of the specimens.Only affect large areas in the late ductility.With the increase of the wall thickness of the outerwear steel pipe,the bearing capacity of reinforced specimen is about 1.9~2.5 times of the damaged specimens.