Wu Bingliu, Liu Xingjian, Jia Junyu, Fang Deming, Shao Jianwen, Kong Wei
The Architectural Design & Research Institute of Zhejiang University Co., Ltd., Hangzhou 310058, China.
Center for Balance Architecture, Zhejiang University, Hangzhou 310058, China.
Materials (Basel). 2024 Aug 16;17(16):4066. doi: 10.3390/ma17164066.
Steel fiber reinforced high-strength concrete (SFRHSC) is a composite material composed of cement, coarse aggregate, and randomly distributed short steel fibers. The excellent tensile strength of steel fiber can significantly improve the crack resistance and ductility of high-strength concrete (HSC). In this study, experimental and numerical investigations were performed to study the cyclic behavior of the HSC beam-column joint. Three SFRHSC and one HSC beam-column joint were prepared and tested under cyclic load. Two different volume ratios of steel fibers and three stirrups ratios in the joint core area were experimentally studied. After verification of the experimental results, numerical simulations were further carried out to investigate the influence of steel fibers volume ratio and stirrups ratio in the joint core area on the seismic performance. Evaluation of the hysteretic response, ductility, energy dissipation, stiffness, and strength degradation were the main aims of this study. Results indicate that the optimal volume fraction of steel fibers is 1.5%, and the optimal stirrups ratio in the joint core area is 0.9% in terms of the enhancement of the seismic performance of the SFRHSC beam-column joint.
钢纤维增强高强混凝土（SFRHSC）是一种由水泥、粗骨料和随机分布的短钢纤维组成的复合材料。钢纤维优异的抗拉强度可显著提高高强混凝土（HSC）的抗裂性和延性。在本研究中，进行了试验和数值研究以探讨高强混凝土梁柱节点的循环性能。制备了三个钢纤维增强高强混凝土梁柱节点和一个高强混凝土梁柱节点，并在循环荷载作用下进行了试验。试验研究了两种不同钢纤维体积比和节点核心区三种箍筋配箍率。在验证试验结果后，进一步进行数值模拟以研究节点核心区钢纤维体积比和箍筋配箍率对抗震性能的影响。评估滞回响应、延性、能量耗散、刚度和强度退化是本研究的主要目的。结果表明，就提高钢纤维增强高强混凝土梁柱节点的抗震性能而言，钢纤维的最佳体积分数为1.5%，节点核心区的最佳箍筋配箍率为0.9%。
