预制混凝土梁-柱-叠合楼板节点抗震性能数值模拟分析

Numerical simulation and analysis of seismic performance of precast concrete beam to column joints with layered slab

梁-柱-叠合板节点是装配整体式混凝土框架结构的研究重点。文中对装配式混凝土框架梁-柱-叠合板边节点和中节点进行了精细化的有限元建模和分析。数值模型中使用了弹簧失效准则的方法模拟预制构件与后浇混凝土之间的界面,考虑了预制梁上下部钢筋的滑移、预制柱内纵筋的受力状态、预制梁端面键槽的设置。为了验证数值模型的准确性,将与试验进行对比分析,结果表明:数值模拟得到的试件破坏形态、滞回曲线、骨架曲线和性能参数与试验结果吻合较好。在验证模型有效的基础上,研究了不同楼板宽度、轴压比、梁板混凝土强度对边节点和中节点抗震性能的影响,为此类装配整体式混凝土结构和工程应用提供参考。

The beam to column joints with layered slab are the key point of assembling concrete frame structures.In this paper,the finite element modeling and analysis are carried out for exterior beam to column joints with layered slab and the interior beam column joints.In the numerical model,spring failure criterion is used to simulate the interface between the precast member and the post-cast concrete,and the slip of the upper and lower steel bars of the precast beam,the stress state of the longitudinal bar in the precast column and the setting of the keyway on the end of the precast beam are considered.To verify the accuracy of the numerical model,a comparative analysis will be performed with the experiment.The results show that the failure modes,hysteresis curves,skeleton curves and performance parameters obtained by numerical simulation are in good agreement with the experimental results.Based on the validity of the model,the effects of different floor widths,axial compression ratio and concrete strength of beam and slab on the seismic performance of side joints and middle joints are studied,which can provide reference for such assembling concrete structures and engineering applications.