Engineered cementitious composite (ECC) material, which is characterized by satisfactory resilience, moderate energy dissipation capacity as well as superhigh compressive and tensile strengths, has been widely applied to civil infrastructures (e.g., bridges, buildings, and coastal structures). To identify sensitive parameters, enhance resilience, and reduce cost of the ECC-reinforced structures effectively, a sensitivity analysis framework for the ECC-reinforced structures is necessary. In this regard, a uniaxial material model for the ECC material is firstly introduced and implemented in an open system for earthquake engineering simulation platform (OpenSees). A sensitivity analysis approach for the ECC material is proposed by deriving a series of sensitivity analysis equations at structure, element, and material levels based on direct differentiation method (DDM). The sensitivity analysis approach is integrated into the OpenSees and could be used directly for the ECC-reinforced structures. At last, the proposed ECC constitutive model are validated by three benchmark examples. The performance assessment and sensitivity analysis are conducted on a prototype bridge. The analyses results indicate that: (1) the earthquake-resistant and damage-control capacities of the ECC material are better than those of the normal concrete; (2) the DDM-based sensitivity analysis method is more efficient and accurate than the FDM-based one.

工程水泥复合材料（ECC）材料具有令人满意的回弹力，适度的能量消散能力以及超高的抗压强度和拉伸强度，已广泛应用于民用基础设施（例如桥梁，建筑物和沿海结构）。为了识别敏感参数，有效增强弹性并降低ECC加固结构的成本，需要针对ECC加固结构的灵敏度分析框架。在这方面，首先在地震工程仿真平台（OpenSees）的开放系统中引入并实现了ECC材料的单轴材料模型。通过在结构，元素，和基于直接微分法（DDM）的物料级别。灵敏度分析方法已集成到OpenSees中，可以直接用于ECC加固的结构。最后，通过三个基准实例验证了所提出的ECC本构模型。性能评估和灵敏度分析是在原型桥上进行的。分析结果表明：（1）ECC材料的抗震能力和破坏控制能力均优于普通混凝土。（2）基于DDM的灵敏度分析方法比基于FDM的灵敏度分析方法更有效，更准确。通过三个基准示例验证了所提出的ECC本构模型。性能评估和灵敏度分析是在原型桥上进行的。分析结果表明：（1）ECC材料的抗震能力和破坏控制能力均优于普通混凝土。（2）基于DDM的灵敏度分析方法比基于FDM的灵敏度分析方法更有效，更准确。通过三个基准示例验证了所提出的ECC本构模型。性能评估和灵敏度分析是在原型桥上进行的。分析结果表明：（1）ECC材料的抗震能力和破坏控制能力均优于普通混凝土。（2）基于DDM的灵敏度分析方法比基于FDM的灵敏度分析方法更有效，更准确。