钢纤维再生混凝土柱大偏心受压承载力研究

Study on Large Eccentric Compression Resistance of Steel Fiber Recycled Concrete Columns

摘要: 本文主要介绍了4根钢纤维再生混凝土柱的大偏心受压静载试验结果，骨料由小粒径再生骨料及大粒径天然骨料组成，初始偏心距为截面有效高度的0.62倍。研究了混凝土强度等级对柱的正截面应变分布、钢筋和混凝土应变、侧向挠度、破坏形态和极限承载力的影响。试验结果表明：钢纤维再生混凝土柱的正截面平均应变分布符合平截面假定，破坏时受压混凝土达到极限应变而压碎，受拉达到屈服强度、受压钢筋接近屈服，可采用现行混凝土设计规范公式计算钢纤维再生混凝土大偏心受压柱的开裂荷载，建议计算正截面承载力时乘以相应的折减系数。

Abstract: This paper mainly introduces the results of 4 steel fiber recycled concrete columns under static large eccentric compression. The aggregate is composed of small particle recycled aggregate and large particle natural aggregate. The initial eccentric distance equaled to 0.62 times of the effective sectional height. The strain distribution of normal section, the strains of concrete and steel bars, the transversal deflection, the failure state and ultimate resistance of the columns affected by the strength grade of concrete were studied. The test results show that: the strain distribution of normal section met the plane section assumption; the compressive concrete reached the ultimate strain companied with crush failure; the tensile steel bars reached the yield strength; the compressive steel bars approached the yield strength; the cracking load of steel fiber recycled concrete column can be calculated by the formulas specified in current design code for concrete structures; the calculation of the bearing capacity is suggested multiplying a reduction factor.