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通过对7根预应力钢带约束方形混凝土柱和1根对比柱的轴压试验,分析钢带间距和钢带层数变化对预应力钢带约束方形混凝土柱破坏形态、承载力、延性、钢带应变等影响。试验结果表明,随钢带间距减小或钢带层数增加,柱承载力提高率越大,变形能力越强;随钢带间距减小,钢带峰值应变越高,钢带约束作用越强。结合试验结果,进一步分析钢带约束下混凝土柱的力学性能和工作机理,建立预应力钢带约束混凝土轴心抗压强度模型。根据试验数据测得的钢带有效拉应变,拟合出钢带约束下混凝土短柱轴心抗压强度计算式。
Based on the axial compression tests of seven prestressed steel columns constrained square concrete columns and one comparison column, the influence of strip spacing and strip number on the failure modes, bearing capacity, ductility, With strain and other effects. The results show that with the decrease of the strip spacing or the increase of the number of strip, the greater the rate of column bearing capacity improvement, the stronger the deformation capacity. With the decrease of the strip spacing, the higher the peak strain of the strip, the stronger the restraint of the strip . Combined with the test results, the mechanical properties and working mechanism of the concrete columns restrained by the steel strip are further analyzed, and the axial compressive strength model of the prestressed steel strip confined concrete is established. Based on the measured steel strip effective tensile strain measured, the compressive strength of the concrete short axis under axial compression is fitted out.