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目的研究内置CFRP层数、含钢率及偏心率对内置CFRP圆管的方钢管高强混凝土组合短柱在偏压作用下力学性能的影响.方法采用ABAQUS有限元程序,对内置CFRP圆管的方钢管高强混凝土组合短柱进行非线性有限元分析.确定了钢管与混凝土以及混凝土与CFRP界面之间接触的确立方法,通过建立模型,分析组合短柱在单向偏压时的荷载-变形全过程关系曲线,得出了短柱在单向偏压作用下各参数对组合短柱的力学性能影响.结果在其他参数相同的情况下,加单层CFRP极限承载力提高3.7%～8.2%,加两层CFRP极限承载力提高5.3%～11.7%,加三层CFRP极限承载力提高8.81%～12.17%.同时构件的后期延性有了显著提高.结论 CFRP的存在有效地改善了高强混凝土延性差及变形小的缺点,使方钢管的约束作用得到充分发挥.
Aim To study the effect of CFRP layer number, steel ratio and eccentricity on the mechanical properties of square steel tube columns with CFRP tube under biasing force.METHODS Using ABAQUS finite element program, The nonlinear finite element analysis of the short column of high-strength concrete-filled steel tubular was carried out. The establishment method of the contact between steel tube and concrete and the interface between CFRP and concrete was established. Through the establishment of the model, the whole process of load- The relationship between the short column and the mechanical behavior of the short column under unidirectional bias was obtained.Results Under the condition of other parameters, the ultimate bearing capacity of single layer CFRP increased by 3.7% ~ 8.2% The ultimate bearing capacity of two-layer CFRP increased by 5.3% ~ 11.7%, the ultimate bearing capacity of three-layer CFRP increased by 8.81% ~ 12.17%, while the post ductility of the components increased significantly.Conclusion The existence of CFRP effectively improves the ductility of high- Small deformation of the shortcomings, so that the constraints of the square tube to give full play.