Kuan Peng, Qing-Li Wang
School of Intelligent Manufacturing, Chengdu Technological University, Chengdu, 610031, People's Republic of China.
School of Civil Engineering, University of Science and Technology Liaoning, Anshan, 114051, People's Republic of China.
Sci Rep. 2025 May 14;15(1):16816. doi: 10.1038/s41598-025-98032-w.
To study the mechanical performance of concrete-filled square CFRP steel tube under compressive-torsional hysteresis loads, 9 concrete-filled square CFRP steel tube to analyze the failure mode, torque angle curve, triaxial strain, and the synergistic effect of steel tube and CFRP on the specimen under cycle loading. The experimental results show that the steel tube and CFRP can work together. Based on the tests, a numerical simulation method is firstly proposed to estimate the concrete-filled CFRP steel tube compressive-torsional specimens under hysteresis loading, and then validated against the representative tests results. As the axial compression ratio increases(0 < n ≤ 0.45), the torsional displacement of the specimen is constrained, resulting in increase of bearing capacity By contrast, as n continuous increases, the initial stiffness of the component begins to decrease, and the bearing capacity also decreases when n > 0.45. In addition, the increase in steel content, CFRP layer, and specimen material strength has a significant impact on the bearing capacity and initial stiffness.
为研究方钢管CFRP混凝土柱在压扭滞回荷载作用下的力学性能，制作了9个方钢管CFRP混凝土柱试件，分析其破坏模式、扭矩-转角曲线、三轴应变以及循环加载下钢管和CFRP对试件的协同作用。试验结果表明，钢管和CFRP能够共同工作。基于试验，首先提出了一种数值模拟方法来估算方钢管CFRP混凝土柱在滞回加载下的力学性能，然后通过典型试验结果进行验证。随着轴压比增大（0＜n≤0.45），试件的扭转变位受到约束，承载力提高；相反，当n继续增大时，构件的初始刚度开始降低，当n＞0.45时，承载力也降低。此外，含钢量、CFRP层数和试件材料强度的增加对承载力和初始刚度有显著影响。
