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采用非线性有限元分析程序ANSYS,选取Shell181单元模拟分层FRP,假定混凝土达到抗压强度后强度不变,对轴压下FRP约束有拐角的方形混凝土短柱受力过程进行了数值模拟。分析表明非线性有限元计算结果与试验结果吻合良好。从FRP对混凝土约束作用的分析可知,FRP对有拐角方形混凝土截面的约束主要集中在角部,FRP对混凝土的约束应力与轴向压应力的关系曲线均呈现出有规律的梯次递进式的变化。从裂缝发展过程看,混凝土开裂主要发生在柱两端,由角部开始再发展到中部。
The non-linear finite element analysis program ANSYS was used to simulate the layered FRP in Shell181. The strength of the concrete was constant after compressive strength was reached. The mechanical behavior of square concrete short columns with FRP constraint under axial compression was numerically simulated. Analysis shows that the results of nonlinear FEM are in good agreement with the experimental results. From the analysis of the restraint effect of FRP on concrete, we can see that the restraints of FRP on the square concrete with corner are mainly concentrated at the corner. The curves of FRP restraining stress and axial compressive stress of concrete all show a regular echelon Variety. From the crack development process, concrete cracking occurs mainly at both ends of the column, starting from the corner and then developed to the middle.