Wang Jun, Wang Xinran, Duan Yuxin, Su Yu, Yi Xinyu
School of Civil Engineering, Northeast Forestry University, Harbin 150000, China.
Materials (Basel). 2022 Jan 3;15(1):329. doi: 10.3390/ma15010329.
At present, the existing standards (AISC360-16, EN1994-1-1:2004, and JGJ138-2016) lack relevant provisions for steel-reinforced concrete (SRC) composite columns with high-strength steel. To investigate the axial compressive mechanical performance of short high-strength steel-reinforced concrete (HSSRC) columns, the axial load test was conducted on 12 short composite columns with high-strength steel and ordinary steel. The influences of steel strength, steel ratio, and the section form of steel on the failure modes, bearing capacity, and ductility of the specimens were studied. Afterward, the experimental data were compared with the existing calculation results. The results show: compared with the specimens with Q235 steel, the bearing capacity of the specimens with Q460 steel increases by 7.8-15.3%, the bearing capacity of the specimens with Q690 steel increases by 13.2-24.1%, but the ductility coefficient increases by 15.2-202.4%; with the increase of steel ratio, the bearing capacity and ductility of specimens are significantly improved. A change of the steel cross-section could influence the ductility of SRC columns more than their bearing capacity. Moreover, the calculation results show that present standards could not predict the bearing capacity of HSSRC columns. Therefore, a modified method for determining the effective strength of steel equipped in HSSRC columns was proposed. The results of the ABAQUS simulation also showed that the addition of steel fibers could significantly improve the bearing capacity of Q690 HSSRC columns. The research results provide a reference for engineering practices.
目前，现有标准（AISC360 - 16、EN1994 - 1 - 1:2004和JGJ138 - 2016）缺乏针对高强钢钢骨混凝土（SRC）组合柱的相关规定。为研究短高强钢骨混凝土（HSSRC）柱的轴向抗压力学性能，对12根采用高强钢和普通钢的短组合柱进行了轴向加载试验。研究了钢材强度、含钢率以及钢截面形式对试件破坏模式、承载力和延性的影响。随后，将试验数据与现有计算结果进行了对比。结果表明：与采用Q235钢的试件相比，采用Q460钢的试件承载力提高了7.8% - 15.3%，采用Q690钢的试件承载力提高了13.2% - 24.1%，但延性系数提高了15.2% - 202.4%；随着含钢率的增加，试件的承载力和延性显著提高。钢截面的改变对SRC柱延性的影响大于对其承载力的影响。此外，计算结果表明现行标准无法预测HSSRC柱的承载力。因此，提出了一种确定HSSRC柱中配置钢材有效强度的修正方法。ABAQUS模拟结果还表明，添加钢纤维可显著提高Q690 HSSRC柱的承载力。研究结果为工程实践提供了参考。
