装配式混凝土框架梁柱抗震性能试验与数值研究

Experimental and Numerical Study on Seismic Performance of Prefabricated Concrete Frame Beams and Columns

为进一步提高装配式混凝土框架梁柱抗震性能,文中采用高强度钢筋的装配式混凝土框架梁柱连接结构,预制梁底部采用小直径高强钢筋代替普通钢筋。在组装预制构件时,小直径钢筋可在键槽范围内自由移动,避免梁和柱的受拉钢筋发生碰撞,并设计三个试样,进行抗震性能试验与数值研究。结果表明,在加载初期,由于模拟节点的边界约束条件考虑得比较理想,节点的初始刚度比试验结果大,这对后面的结果影响不大,且有限元计算结果与实验结果吻合得较好。与XJ相比,YZ1和YZ2试样的能量吸收能力和抗震性能较弱。因此,现浇试样具有较好的抗震性能。

In order to further improve the seismic performance of prefabricated concrete frame beams and columns,this paper adopts a high-strength steel bar prefabricated concrete frame beam column connection structure.Small diameter high-strength steel bars are used at the bottom of prefabricated beams instead of ordinary steel bars.When assembling prefabricated components,small-diameter steel bars can move freely within the keyway range to avoid collisions between the tensile steel bars of beams and columns.Three specimens are designed for seismic performance testing and numerical research.The experimental results indicate that during the initial loading stage,due to the ideal consideration of the boundary constraints of the simulated nodes,the initial stiffness of the nodes is greater than the experimental results,which has little impact on the subsequent results.And the finite element calculation results are in good agreement with the experimental results.Compared with XJ,the energy absorption capacity and seismic performance of YZ1 and YZ2 specimens are weaker.Therefore,cast-in-place specimens have good seismic performance.