Wang Qingli, Liu Xiaokang, Peng Kuan
School of Civil Engineering, University of Science and Technology Liaoning, Anshan 114051, China.
School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China.
Polymers (Basel). 2022 Aug 17;14(16):3350. doi: 10.3390/polym14163350.
Concrete-filled CFRP steel tube (CF-CFRP-ST) structures often suffer from shear loading in practical engineering, such as joints with diagonal braces. To study the shear properties of CF-CFRP-ST, we take the concrete strength and the longitudinal CFRP layers as the main parameters, and static shear tests of overall 9 circular concrete-filled CFRP-steel tube (C-CF-CFRP-ST) and 3 circular concrete-filled steel tube (C-CFST) are carried out. The research is carried out from two aspects: experiment and finite element. The experimental results show that the shear loading-displacement curves of the specimens can be divided into elastic stage, strengthening stage, and softening stage. The increases of the strength of the concrete and the layers of the transverse CFRP can both enhance the shearing load carrying capacity of the specimen. With the increase of concrete strength, there is no obvious change in the shape of the shear stress-shear strain curves of the specimens, and the shear stress and the stiffness of the curve in the elastic stage of the specimen are slightly increased. The shear loading-displacement curves of the specimens are simulated by using finite element software ABAQUS and it is found that the predicted results agree reasonably well with the test results. Then, the whole process of loading and the parameters of the main influencing factors are analyzed. Finally, the calculation equation of CFRP concrete-filled steel tubular shear capacity is established.
CFRP 钢管混凝土（CF-CFRP-ST）结构在实际工程中常承受剪切荷载，如带有斜撑的节点。为研究 CF-CFRP-ST 的抗剪性能，以混凝土强度和纵向 CFRP 层数为主要参数，对 9 个圆形 CFRP 钢管混凝土（C-CF-CFRP-ST）试件和 3 个圆形钢管混凝土（C-CFST）试件进行了静力剪切试验。研究从试验和有限元两个方面展开。试验结果表明，试件的剪切荷载-位移曲线可分为弹性阶段、强化阶段和软化阶段。混凝土强度和横向 CFRP 层数的增加均能提高试件的抗剪承载力。随着混凝土强度的提高，试件剪应力-剪应变曲线的形状无明显变化，试件弹性阶段曲线的剪应力和刚度略有增加。利用有限元软件 ABAQUS 对试件的剪切荷载-位移曲线进行了模拟，发现预测结果与试验结果吻合较好。然后，分析了加载全过程及主要影响因素的参数。最后，建立了 CFRP 钢管混凝土抗剪承载力的计算方程。
