钢筋与橡胶混凝土之间良好的粘结性能,是橡胶混凝土工程应用的基础。为研究不同加载速率下钢筋与橡胶混凝土的粘结性能,对钢筋橡胶混凝土试件进行不同加载速率(0.01~1 mm/s)下的中心拉拔试验,分析加载速率、橡胶替换率及钢筋直径对钢筋与橡胶混凝土粘结性能与破坏状态的影响。试验结果表明,钢筋直径对拉拔试件的破坏方式影响显著,钢筋直径18 mm的试件发生劈裂破坏,钢筋直径14 mm的试件发生钢筋拔出破坏。此外,加载速率对粘结滑移曲线中的关键参数值也有显著影响。通过理论分析提出了不同加载速率下钢筋与橡胶混凝土粘结滑移关系计算模型,模型评估结果表明新建立模型的计算结果与试验结果吻合良好,可以用于预测不同加载速率下钢筋与橡胶混凝土之间的粘结滑移关系。

The bond strength between steel bars and rubberized concrete is crucial for the engineering application of rubberized concrete. To investigate the bonding properties under various loading rates, center pull-out tests were conducted under a range of loading rates (0.01 mm/s to 1 mm/s). The impacts of loading rate, rubber replacement ratio, and steel bar diameter on the bonding performance and the failure mode were examined. Results indicate that steel bar diameter significantly influences the failure mode of the pull-out specimens: specimens with 18 mm diameter bars exhibited split failures, while those with 14 mm diameter bars experienced pull-out failures. Additionally, loading rate markedly affects key parameters in the bond stress-slip curve. Based on theoretical analysis, a new model for the bond-slip relationship between steel bars and rubberized concrete under varying loading rates was proposed. Model evaluation demonstrates that predictions from this model align well with experimental results, which manifests the model’s applicability to predicting the bond stress-slip relationship between steel bars and rubberized concrete across different loading rates.