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为研究钢管宽厚比及再生骨料取代率对方钢管再生混凝土短柱力学性能的影响,设计9根方钢管再生混凝土短柱进行了轴压试验,观察了试件在轴压力作用下的破坏过程,分析了钢管宽厚比和再生骨料取代率对试件荷载—位移和荷载—应变曲线的影响。结果表明,宽厚比及再生骨料取代率对钢管再生混凝土短柱的最终破坏形态影响不大,与普通钢管混凝土短柱相似,各试件均呈剪切破坏,最终破坏时,其纵向变形均超过30 mm;随着再生骨料取代率增大,荷载—位移曲线下降段越陡,但随着钢管宽厚比的增大,再生骨料取代率超过30%后,试件极限承载力越接近,说明考虑再生骨料取代率的不利影响更合理。最后结合试验提出了钢管再生混凝土短柱承载力计算方法,将计算结果与相关规程进行了对比,供工程应用参考。
In order to study the effect of steel tube width to thickness ratio and recycled aggregate substitution rate on the mechanical properties of concrete filled square steel tubular short columns, 9 square concrete filled steel tubular short columns were designed to carry out axial compression tests. The failure process under axial pressure was observed, The effects of steel tube width to thickness ratio and recycled aggregate substitution rate on load-displacement and load-strain curves were analyzed. The results show that the aspect ratio and the replacement ratio of recycled aggregates have little effect on the ultimate failure mode of the recycled concrete short columns. Compared with ordinary CFST short columns, the specimens show shear failure. Over 30 mm. As the replacement rate of recycled aggregates increases, the descending section of load-displacement curve becomes steeper. However, with the replacement ratio of recycled aggregate over 30%, the ultimate bearing capacity of specimens is closer , Indicating that considering the adverse effects of recycled aggregate replacement rate is more reasonable. The calculation method of the bearing capacity of concrete filled steel tubular short column is put forward finally. The calculation results are compared with the relevant rules for engineering application.