Li Zuohua, Peng Zhihan, Teng Jun
Shenzhen Key Lab of Urban & Civil Engineering Disaster Prevention & Reduction, Harbin Institute of Technology, Shenzhen 518055, China.
School of Civil and Environment Engineering, Harbin Institute of Technology, Shenzhen 518055, China.
Materials (Basel). 2020 Nov 24;13(23):5320. doi: 10.3390/ma13235320.
Compared with normal strength concrete (NSC), ultra-high-performance steel fiber-reinforced concrete (UHPFRC) shows superior performance. The concrete damage plasticity (CDP) model in ABAQUS can predict the mechanical properties of UHPFRC components well after calibration. However, the simulation of the whole structure is seriously restricted by the computational capability. In this study, a novel multi-scale modeling strategy for UHPFRC structure was proposed, which used a calibrated CDP model. A novel combined multi-point constraint (CMPC) was established by the simultaneous equations of displacement coordination and energy balance in different degrees of freedom of interface nodes. The advantage is to eliminate the problem of the tangential over-constraint of displacement coordination equation at the interface and to avoid stress iteration of the energy balance equation in the plastic stage. The expressions of CMPC equations of typical multi-scale interface connection were derived. The multi-scale models of UHPFRC components under several load cases were established. The results show that the proposed strategy can well predict the strain distribution and damage distribution of UHPFRC while significantly reducing the number of model elements and improving the computational efficiency. This study provides an accurate and efficient finite element modeling strategy for the design and analysis of UHPFRC structures.
与普通强度混凝土（NSC）相比，超高性能钢纤维增强混凝土（UHPFRC）表现出卓越的性能。ABAQUS中的混凝土损伤塑性（CDP）模型在校准后能够很好地预测UHPFRC构件的力学性能。然而，整个结构的模拟受到计算能力的严重限制。在本研究中，提出了一种用于UHPFRC结构的新型多尺度建模策略，该策略使用了校准后的CDP模型。通过界面节点不同自由度下位移协调和能量平衡的联立方程建立了一种新型组合多点约束（CMPC）。其优点是消除了界面处位移协调方程切向过度约束的问题，并避免了塑性阶段能量平衡方程的应力迭代。推导了典型多尺度界面连接的CMPC方程表达式。建立了几种荷载工况下UHPFRC构件的多尺度模型。结果表明，所提出的策略能够很好地预测UHPFRC的应变分布和损伤分布，同时显著减少模型单元数量并提高计算效率。本研究为UHPFRC结构的设计和分析提供了一种准确高效的有限元建模策略。
