基于量化延性的钢筋混凝土抗震墙约束箍筋设计法

Quantitative ductility-based design method of confining stirrups for RC walls

有研究表明,我国抗震规范中的钢筋混凝土抗震墙约束箍筋设计法无法将延性量化,使同一抗震等级下能达到的延性不平衡。为了克服规范中的不足,提出了基于钢筋拉断破坏和混凝土压溃破坏两种破坏下基于量化延性指标的约束箍筋设计法。利用评估结果将我国规范抗震等级一级(9度),一级(7、8度)和二、三级时的延性设计指标定量为5、3.5和2.5,并将我国规范修改成定量的延性设计法,结果表明修改后的方法量化了不同抗震等级的延性,且克服了现行规范同一抗震等级延性不平衡的不合理性。

Recent research showed that the of RC walls different in the same seismic confining stirrup design method is not level. A new ductility-based design reasonable, making the ductility method of confining stirrups is obtained which considers concrete compression failure and reinforcement fracture failure modes. Using evaluation of ductility of RC wails designed according to Seismic Grade I （Intensity 9）, Grade I （Intensity 6, 7 or 8 ）, and Grade II or III, the ductility index of these three levels are chosen into as 5,3.5 and 2.5. Using the proposed ductility-based method and these three ductility indexes, this paper modifies the current Chinese method into quantitative ductility-based method. The new method overcomes the disequilibrium of initial Chinese method.