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对6个受火后的钢管再生混凝土柱进行轴压力学性能试验,研究混凝土材料和钢管壁厚对试件破坏形态、荷载-位移关系、荷载-应变关系的影响。研究结果表明:受火后的钢管再生混凝土柱的破坏形态为柱身向一侧弓起的屈曲破坏,且钢管上部变形严重;在钢管壁厚较小的情况下,混凝土材料对钢管混凝土柱的承载能力影响较大,但随着钢管壁厚的增加,混凝土材料影响比重迅速减小;钢管壁厚(含钢率)是影响钢管(再生)混凝土柱承载力的主要因素。
The axial compressive mechanical tests of six recycled concrete columns subjected to fire were carried out to study the influence of concrete material and wall thickness on the failure morphology, load-displacement relationship and load-strain relationship of the specimens. The results show that the failure mode of post-fire concrete column is the buckling damage of the column body to one side, and the deformation of the upper part of the steel pipe is serious. When the wall thickness of the steel pipe is small, the damage of concrete to the concrete filled steel tubular column However, with the increase of steel pipe wall thickness, the influence proportion of concrete material decreases rapidly. The steel pipe wall thickness (including steel ratio) is the main factor affecting the bearing capacity of steel pipe (recycled) concrete column.