轴压比对RC框架结构“强柱弱梁”屈服机制的影响研究

摘要

The values of axial compression ratios have remarkable effect on the realization of the “weak beam_strong column” mechanism. Plenty of studies revealed that high limit axial compression ratio values couldn’ t effectively guarantee the realization of “strong column_weak beam” yield mechanism. The available literature did not provide axial reference compression ratios value range for engineering practice. With the aid of the structural analysis program ABAQUS , by varying concrete grade, different column axial compression ratios without changing stiffness ratios are got. By using elastic_plastic dynamic time history analysis, the axial compression ratios value range is analysed effectively and the realization of“weak beam_strong column” mechanism can be guaranteed. The present study may provide reference for engineering design.%轴压比对RC框架结构“强柱弱梁”的实现有重要的影响,之前大量研究只是表明,高轴压比不能有效地实现“强柱弱梁”屈服机制。现有文献并未给出现行规范下实际可供参考的轴压比取值范围,以保证结构更好地实现强柱弱梁屈服机制。利用ABAQUS,通过改变混凝土等级的方法,不仅能够实现不同柱轴压比,还能保证梁、柱刚度比不发生变化。采用弹塑性动力时程分析方法,更有效地分析轴压比的影响,提出可供参考的轴压比取值范围建议,保证结构“强柱弱梁”屈服机制的实现,为工程设计提供一定的参考。