钢筋混凝土构件模型的配筋率及保护层厚度研究

运用相似性原理,对钢筋混凝土轴心受压、大偏心受压柱以及钢筋混凝土梁的强度相似条件进行推导,确定了模型试验中模型构件配筋率及混凝土保护层厚度的理论取值,并采用误差分析方法分析了模型混凝土保护层厚度取值对承载力相似性的影响.分析表明,在进行钢筋混凝土构件模型试验时,宜采用与原型相同的配筋率.对于轴心受压柱,模型保护层厚度不产生误差;对于钢筋混凝土梁,模型保护层厚度取原型保护层厚度除以0.5倍比例系数,此时误差可以控制在10%;对于大偏压柱,建议保护层厚度取原型保护层厚度除比例系数.

Research on the Reinforcement Ratio and the Thickness of Concrete Cover of Reinforced Concrete Model

Similarity principle was applied to obtain the certain conditions of strength similarity among reinforced concrete column and beam under axial compression, and compression with large eccentricity. The theoretical values of the reinforcement ratio and the thickness of concrete cover were derived, and by selecting the thickness of concrete cover of the model on the bearing capacity, the influence of similar errors was analyzed. The analysis shows that the same reinforcement ratio with the prototype is appropriate for the model test in the reinforced concrete member model test. For axial compression column, the thickness of the concrete cover of the model does not have any error. For the reinforced concrete beam, the thickness of the concrete cover of the model takes prototype protective layer thickness divided by 0.5 times the proportional coefficient. The error can be controlled within 10%. For large bias column, it is suggested that the thickness of the concrete cover takes prototype protective layer thickness in addition to scale coefficient.