This paper presents a combined experimental and numerical study on the low-velocity lateral impact behavior of reinforced ultra-high performance concrete (UHPC) members. Firstly, a total of eleven steel bar reinforced UHPC and two reinforced normal strength concrete (NSC) control specimens with the identical dimensions (300 mm × 300 mm × 2200 mm) were prepared and tested under drop hammer impact. By examining the influences of impact energy (16.66-33.32 kJ) and the axial force (140-1400 kN) on the dynamic damage and responses of specimens, the outstanding impact resistance of UHPC members is validated and assessed quantitatively. Besides, the presence of axial force can effectively improve the lateral impact resistance of the UHPC members, particularly the recovery of deformation. Secondly, based on the commercial finite element (FE) program LS-DYNA, a FE model was established to predict the impact behavior of UHPC members. The Continuous Surface Cap (CSC) model for NSC was adopted, and the corresponding model parameters for UHPC were calibrated based on a series of test data, i.e., static compressive and direct tensile tests, dynamic compressive and tensile tests, triaxial compressive tests, and hydrostatic tests. Furthermore, the generation method of CSC model parameters for UHPC was proposed, which was fully validated by comparing with the present and existing low-velocity impact test data on reinforced UHPC and UHPC filled steel tube (UHPC-FST) members.

本文提供了结合的实验和数值研究，研究了钢筋超高性能混凝土（UHPC）构件的低速侧向冲击行为。首先，准备了十一个钢筋钢筋UHPC和两个相同尺寸（300 mm×300 mm×2200 mm）的钢筋普通强度混凝土（NSC）对照试样，并在落锤冲击下进行了测试。通过检查冲击能（16.66-33.32 kJ）和轴向力（140-1400 kN）对试样动态损伤和响应的影响，对UHPC构件出色的抗冲击性进行了验证和定量评估。此外，轴向力的存在可以有效地提高UHPC构件的横向抗冲击性，特别是变形的恢复。其次，基于商业有限元程序LS-DYNA，建立了有限元模型来预测UHPC成员的撞击行为。采用了NSC的连续表面盖（CSC）模型，并根据一系列测试数据对UHPC的相应模型参数进行了校准，这些数据包括静态压缩和直接拉伸测试，动态压缩和拉伸测试，三轴压缩测试以及静水压试验。此外，提出了用于UHPC的CSC模型参数的生成方法，并通过与现有和现有的UHPC和UHPC-FST增强钢管构件的低速冲击试验数据进行比较，充分验证了该方法。根据一系列测试数据对UHPC的相应模型参数进行了校准，即静态压缩和直接拉伸测试，动态压缩和拉伸测试，三轴压缩测试以及静水压测试。此外，提出了用于UHPC的CSC模型参数的生成方法，通过与现有和现有的UHPC和UHPC填充钢管（UHPC-FST）构件的低速冲击试验数据进行比较，充分验证了该方法。根据一系列测试数据对UHPC的相应模型参数进行了校准，即静态压缩和直接拉伸测试，动态压缩和拉伸测试，三轴压缩测试以及静水压测试。此外，提出了用于UHPC的CSC模型参数的生成方法，并通过与现有和现有的UHPC和UHPC-FST增强钢管构件的低速冲击试验数据进行比较，充分验证了该方法。