基于单丝短切纤维在细观尺度从硬化基体中拔出的特性，考虑了界面化学键、潜在纤维脱黏断裂、潜在纤维滑移断裂和滑移硬化界面特性，对高延性水泥基复合材料(HDCC)设计理论的裂纹桥联应力-裂纹张开关系(σB-δ σB-δ关系)进行了系统分析和理论推导，并建立了σB-δ 关系模型。通过实验测试数据对建立的模型进行了验证，发现σB-δ 关系模型预测的有关复合材料特性，如抗拉强度和破坏后平均裂纹张开度与实验结果具有良好的一致性。

The interface chemical bond, potential fiber de-bonding fracture, potential fiber slip fracture and slip hardening interface characteristics were concerned based on the micron-scale pull-out characteristics of single staple fiber from the hardened matrix. The crack bridging stress-crack (σB-δ )opening relationship based on high ductility cementitious composite (HDCC) design theory was analyzed, and the (σB-δ )relation model of HDCC was proposed. In addition, the established model was verified by the experimental test data, indicating that the properties (i.e., tensile strength and average crack opening after failure) of HDCC predicted by the model are in reasonable agreement with the experimental results.