再生粗骨料钢筋混凝土梁短期刚度研究

Study on short term stiffness of reinforced concrete beams with recycled coarse aggregates

对27根再生混凝土梁和3根普通混凝土梁进行正截面弯曲性能试验,研究再生混凝土梁短期刚度及其计算方法。试验结果表明,相同条件下再生混凝土梁跨中挠度比普通混凝土梁跨中挠度大11%左右。参考普通混凝土梁,根据试验结果回归出再生混凝土梁内力臂系数、截面弹塑性抵抗矩系数以及不均匀系数表达式,从而得出再生混凝土梁短期刚度的计算式。通过收集国内外再生混凝土梁试验结果对本文刚度公式进行验证,两者吻合较好。

The flexural properties of 27 reinforced concrete beams with recycled aggregates and 3 reinforced concrete beams with ordinary aggregates are experimentally investigated. The calculation method for the stiffness of reinforced concrete beams with recycled aggregates is studied. The results show that the mid-span deflection of the concrete beams with recycled coarse aggregates is larger than that of the ordinary aggregate concrete beams by 11%,with other conditions identical. The internal force arm coefficient,comprehensive coefficient of average strain and non-uniformly distributed strain coefficient of the longitudinal tensile reinforcement of the reinforced concrete beams with recycled aggregates are obtained. A formula for the flexural stiffness of reinforced concrete beams with recycled coarse aggregates is presented. The calculation values of the mid-span deflection of beams with recycled coarse aggregates are in good agreement with the test values obtained by other researchers.