混杂纤维RAC框架节点的有限元分析
Finite Element Analysis of RAC Frame Joints Containing Hybrid Fibers

利用再生钢纤维与聚丙烯纤维（TANK纤维）对再生骨料混凝土（RAC）进行了性能增强，并进行了相应的基本材性试验，利用所得数据确定了混杂纤维掺量（质量分数）0%，0.3%，0.5%，？？1.0%？？下的纤维再生混凝土本构方程；利用有限元软件ABAQUS对不同混杂纤维掺量RAC框架节点进行了拟静力非线性分析，得出相应的滞回曲线、骨架曲线、刚度退化曲线，并分析了其耗能性能和等效粘滞阻尼系数。结果表明：混杂纤维能够较为有效地改善RAC的基本力学性能，同时对于框架节点的抗震性能亦有较为明显的改善，并且随着混杂纤维掺量的增大，其抗震性能均有所提高。
Adding steel fiber and TANK fiber into recycled aggregate concrete (RAC) to enhance its performance, the corresponding basic material property tests were carried out. The constitutive equation of the RAC was determined by using the obtained experimental data, which had different hybrid fiber content (mass fraction) 0%, 0.3%, 0.5%, 1.0%. The finite element software ABAQUS was used to conduct pseudo？？static nonlinear analysis of the RAC frame joints with different hybrid fiber contents. The hysteresis curves, skeleton curves and the stiffness degradation curves were obtained, the energy dissipation capacity and equivalent viscous damping coefficients were analyzed. The results show that hybrid fiber can be more effective to improve the basic mechanical properties of the RAC. Meanwhile, the seismic performance of the frame joints has a more significant improvement. With the increasing of hybrid fiber content, the seismic performance of RAC can be improved