CFRP加固方钢管混凝土在弯-扭荷载作用下的性能研究

Research on Mechanical Properties of CFRP Confined Concrete-Filled Square Steel Tubular Under Bending-Torsion Load

为了研究方截面CFRP-钢管混凝土的弯-扭性能,以9个方截面CFRP-钢管混凝土弯扭性能试件的试验研究为基础,利用有限元软件ABAQUS模拟了方CFRP-钢管混凝土扭矩-转角(T-θ)曲线和破坏模态,并将模拟结果与试验结果进行比较。结果表明:模拟与试验结果吻合较好。在验证模型可靠性的基础上,对构件的受力全过程和参数分析进行了研究。在有限元与试验的基础上,提出了方CFRP-钢管混凝土的弯-扭承载力的计算表达式。研究表明:随着混凝土强度、钢材屈服强度和含钢率的提高构件承载力显著增大,随着CFRP层数增加构件承载力略有提高,随着弯矩比的增大构件承载力略有降低,提出的方CFRP-钢管混凝土的弯-扭承载力计算表达式所预测的试件承载力与试验结果基本一致。

In order to study the mechanical properties of CFRP confined concrete-filled square steel tubular under bending-torsion load, based on the experimental study of mechanical properties of nine CFRP confined concrete-filled square steel tubular under bending-torsion load, the T-θ curve and failure mode of CFRP confined concrete-filled square steel tubular were simulated by using the finite element software ABAQUS, and the simulation results were compared with the experimental results. The results showed that the simulation results were in good agreement with the experimental results. On the basis of verifying the reliability of the model, the whole stress process and parameter analysis of the component were studied. On the basis of finite element simulation and test, the calculation expression of bearing capacity of CFRP, confined concrete-filled square steel tubular under bending-torsion load was proposed. The research showed that the bearing capacity of member increased significantly with the increase of concrete strength, steel yield strength and steel ratio, increased slightly with the increase of CFRP layers, and decreased slightly with the increase of moment ratio. The bearing capacity of specimen predicted by the proposed calculation expression was basically consistent with the test results.