部分包裹混凝土偏心受压柱的受力性能研究

Experiment study on the behavior of partially encased concrete columns subjected to eccentric compression

为了合理地建立部分包裹混凝土偏心受压柱的强度计算方法,对8根部分包裹混凝土偏心受压短柱的受力性能进行了试验研究.试验在5 000 kN试验机上进行,主要测量了型钢、箍筋和混凝土的纵向应变、试件的裂缝发展过程、试件跨中的荷载-挠度曲线及试件的极限承载力.试件的主要参数为含钢率、荷载作用的偏心距和配箍率.试验结果表明,随着初始偏心距的增大,偏心受压柱的承载力降低;随着含钢率和配箍率的提高,偏心受压柱的承载能力提高,但含钢率达到一定的值(10%左右)以后,承载力提高很小.含钢率和配箍率是影响柱子延性的主要因素.

In order to investigate the structural behavior of partially encased concrete （PEC） short columns subjected to eccentric compression ,eight short PEC composite columns were, tested under eccentric loading conditions. All of the tests were carried out in a vertical hydraulic universal testing machine with a capacity of 5000 kN. Effects of steel ratio, hoops ratio and eccentricity of the axial load on columns capacities are studied. The experimental results show that the load-carrying capacity is reduced with the increased eccentricity. The steel ratio and hoops ratio have no obvious influence on the eccentrically loaded column capacity, which are important parameters affecting the ductility of PEC columns.