考虑混凝土损伤效应的销栓作用承载力计算模型
Mathematical model for dowel bearing capacity considering the effect of concrete damage

在已有钢筋销栓作用承载力计算模型的基础上，该文提出了考虑混凝土损伤效应的承载力计算模型，进行了11个试件的直接剪切实验，研究钢筋直径、混凝土抗压强度和保护层厚度对销栓作用承载性能的影响。基于实验和数值分析结果，率定混凝土局部受压损伤效应所造成的承载性能衰减并对常用模型进行修正。通过对不同保护层厚度试件的数值模拟，率定出破坏形态转化的关键影响因子，并在计算模型中加以考虑。将直接剪切实验和文献实验的结果与修正后的模型计算结果进行对比发现：该文提出的考虑损伤效应的计算模型可以准确地预测不同破坏模式下钢筋销栓作用的承载性能。
Abstract：The measured bearing capacities of dowels embedded in concrete were compared with existing formula for various conditions. A total of 11 specimens were tested to failure to investigate the effect of the bar diameter, concrete strength and concrete cover on the dowel bearing capacity. The effect of localized crushing of the concrete found from the experiment and numerical results was used to improve the formula accuracy. Specimens with different concrete covers were simulated to study the key parameters affecters the failure mechanisms. Comparisons of the analytical results with experimental data showed that the model gives good predictions for both failure mechanisms.