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为了加快综合应用包容型再生混凝土,掌握方钢管约束的包容型再生混凝土柱轴压承载力性能,设计了11根试验柱进行轴压承载力试验,考虑的主要因素包括旧料混凝土掺入率、旧料混凝土强度、膨胀剂掺入量和钢筋配置情况。采用叠加法、Von Mises屈服条件和试验拟合法,推导构件的承载力计算公式。试验表明,在试件中掺入同强度的旧料,掺入率可达50%,承载力下降10%以内;掺入较低强度的旧料,掺入率为30%,承载力下降不超过15%;膨胀剂掺入量达水泥用量10%时,试件承载力提升较明显;试件中配置纵向钢筋,可以有效提高构件承载力。方钢管约束的包容型再生混凝土柱具有良好的轴压承载力,工程应用前景良好;所提出的公式计算结果与试验结果吻合较好,可为工程应用提供有益的参考。
In order to speed up the comprehensive application of containment type recycled concrete and grasp the axial compressive capacity of the confined tubular reinforced reclaimed concrete columns constrained by square steel tube, 11 test columns were designed to carry out axial compression bearing capacity test. The main factors considered include the incorporation rate, Old concrete strength, expansion agent incorporation and reinforcement configuration. Adopting superposition method, Von Mises yielding condition and experimental fitting method, the formula of bearing capacity of component is deduced. The tests show that the incorporation of the same strength of the old material, the incorporation rate of up to 50%, the bearing capacity decreased by 10%; incorporation of lower strength of the old material, the incorporation rate of 30%, the bearing capacity decreased not More than 15%. When the amount of expansive agent is up to 10%, the load-carrying capacity of the specimen is obviously improved. Longitudinal reinforcement arranged in the specimen can effectively increase the bearing capacity of the member. The square steel pipe constrained packed recycled concrete columns have good axial compressive bearing capacity and good engineering application prospects. The proposed formulas are in good agreement with the experimental results and provide a useful reference for engineering application.