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为了解双层箍筋对混凝土变形性能的影响,对6根双层箍筋约束混凝土圆形柱与2根普通箍筋圆柱进行了轴心受压试验,研究了其破坏过程和破坏形态。并基于试件的荷载-应变曲线,分析了箍筋形式、内外层箍筋间距以及配箍特征值对试件变形性能的影响。结果表明:双层箍筋比普通箍筋能更有效地提高高强混凝土的延性,从而提高了混凝土柱的变形性能。
In order to understand the influence of double-tiered stirrup on the deformation performance of concrete, six double-tiered confined concrete circular columns and two ordinary stirrup cylinders were tested for axial compression, and the failure process and failure mode were studied. Based on the load-strain curves of the specimens, the influence of the stirrup form, the distance between the inner and the outer stirrups and the characteristic value of the bail on the deformation properties of the specimens was analyzed. The results show that the double-tiered stirrup can improve the ductility of high-strength concrete more effectively than ordinary stirrups, thus improving the deformation performance of concrete columns.