Dynamic responses of reinforced ultra-high performance concrete members under low-velocity lateral impact
Dynamic responses of reinforced ultra-high performance concrete members under low-velocity lateral impact
复制标题
低速侧向冲击下钢筋超高性能混凝土构件的动力响应
DOI：
10.1016/j.ijimpeng.2021.103818
复制
发表时间：
2021-01-18
影响因子：
5.1
通讯作者：
Fang, Q.
中科院分区：
文献类型：
--
作者：
Jia, P. C.;Wu, H.;Fang, Q.
对超高性能混凝土构件的低速侧向冲击性能进行了试验和数值模拟研究。首先，共11个钢筋加固UHPC和两个钢筋正常强度混凝土（NSC）的控制样本具有相同的尺寸（300 mm × 300 mm × 2200 mm），并在落锤冲击下进行测试。通过考察冲击能量（16.66-33.32 kJ）和轴力（140-1400 kN）对试件动力损伤和响应的影响，定量地验证和评价了UHPC构件优异的抗冲击性能。轴力的存在可以有效地提高UHPC构件的抗侧冲击性能，尤其是变形的恢复。其次，基于商用有限元程序LS-DYNA，建立了UHPC构件冲击性能的有限元模型。NSC采用了连续表面帽（CSC）模型，并根据一系列试验数据标定了UHPC的相应模型参数，即，静态压缩和直接拉伸试验、动态压缩和拉伸试验、三轴压缩试验和静水试验。提出了UHPC构件CSC模型参数的生成方法，并与现有的UHPC加固构件和UHPC填充钢管构件的低速冲击试验数据进行了对比验证。
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 x 300 mm x 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.