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重点考虑收缩和徐变等因素,对再生混凝土梁的时变挠度进行了理论分析。假定收缩和徐变不会相互影响,通过截面时随分析,得到再生混凝土梁时变相对受压区高度表达式。依据现有文献的试验数据,对分析结果准确性进行了验证。结果表明:对于不同的再生粗骨料取代率,时变挠度的计算结果与试验结果相比,大多数误差可控制在19%以内。该文的工作较好揭示了再生混凝土梁时变挠度的演化特点,可以为今后再生混凝土梁的长期挠度预测提供理论基础。
Considering the factors of shrinkage and creep, the time-dependent deflection of recycled concrete beams is theoretically analyzed. Assuming that shrinkage and creep do not affect each other, the height-dependent relative compression zone height expression of recycled concrete beams is obtained with the analysis of the section. Based on the experimental data of the existing literature, the accuracy of the analysis results was verified. The results show that, for different replacement rates of recycled coarse aggregate, the calculated results of time-varying deflection compared with the experimental results, most of the errors can be controlled within 19%. The work of this paper reveals the evolvement characteristics of time-dependent deflection of recycled concrete beams better, which can provide theoretical basis for the long-term deflection prediction of recycled concrete beams.