In this paper, a modified intermediately homogenized peridynamic (IH-PD) model for analyzing impact failure of wet concrete has been presented under the configuration of ordinary state-based peridynamic theory. The meso-structural properties of concrete are linked to the macroscopic mechanical behavior in the IH-PD model, where the heterogeneity of concrete is taken into account, and the calculation cost does not increase. Simultaneously, the porosity of concrete is considered, which is implemented by deleting the bond between two material points, as well as the influence of porosity on the mechanical properties of concrete. Moreover, the effective bulk and shear modulus of cement mortar in wet concrete (saturated and unsaturated concrete) are calculated respectively. The dynamic model for wet concrete is described from three aspects: strength, dynamic increase factor, and equation of state. Validation of the proposed model is established through analyzing some benchmark tests and comparing with the corresponding experiment and other available numerical results.

本文在基于普通状态的近场动力学理论的配置下，提出了一种改进的中间均质近场动力学（IH-PD）模型，用于分析湿混凝土的冲击破坏。混凝土细观结构特性与IH-PD模型中的宏观力学行为相关联，其中考虑了混凝土的异质性，计算成本不增加。同时考虑了混凝土的孔隙率，通过删除两个材料点之间的结合以及孔隙率对混凝土力学性能的影响来实现。此外，分别计算了湿混凝土（饱和和非饱和混凝土）中水泥砂浆的有效体积模量和剪切模量。湿混凝土的动力模型从三个方面描述：强度、动态增加因子和状态方程。通过分析一些基准测试并与相应的实验和其他可用的数值结果进行比较来建立所提出模型的验证。