钢管自密实再生混凝土短柱的承载力计算方法

Calculation Method of Bearing Capacity for Self-compacting Recycled Concrete-filled Steel-Tube Short Column

自密实再生混凝土的骨料粒径较普通混凝土小,且再生骨料的性能较天然骨料低。因此,钢管自密实再生混凝土的承载能力与钢管普通混凝土存在一定差异。本文分析了现有的钢管普通混凝土短柱轴压和偏压承载力计算公式的适用性,基于统一理论和极限平衡理论提出了相应的钢管自密实再生混凝土短柱轴压承载力计算公式,基于经验系数法提出了钢管自密实再生混凝土短柱偏压承载力的计算公式。研究结果表明:所提出的实用计算公式能准确地计算钢管自密实再生混凝土短柱的轴压和偏压承载力。

The aggregate size of the self-compacting recycled concrete is smaller than that of the ordinary concrete,and the properties of the recycled aggregate is lower than those of the natural aggregate.Therefore,the bearing capacity of the self-compacting recycled concrete-filled steel-tube stub columns are different from ordinary concrete filled steel-tube stub columns.The applicability of the existing formulas for calculating the axial and eccentric bearing capacity of the concrete-filled steel-tube stub columns was studied in this paper.Based on the unified theory and the limit equilibrium theory,the empirical formulas for predicting the axial bearing capacity of the self-compacting recycled concrete-filled steel-tube stub columns were suggested respectively,and the empirical formulas for predicting the eccentric bearing capacity of the self-compacting recycled concrete-filled steel-tube stub columns were also suggested based on the empirical coefficient method.The analytical results indicate that the empirical formulas presented in this paper can predict the axial and eccentric bearing capacity of the self-compacting recycled concretefilled steel-tube stub columns accurately.