关于地震区框架柱轴压比限值的讨论

Discussion on frame columns axial compression ratio limit in seismic zone

地震区框架结构底层柱常因轴压比限值制约截面尺寸过大，使柱形成短柱．本文从设计中这一现象出发，通过限制轴压比的必要性以及放宽轴压比可能性的讨论，在试验结果分析基础上提出采用复合螺旋箍可使现行规范的轴压比限值适当放宽，可达到减小柱截面尺寸、提高柱抗震性能之效果．

The aseismie frame base columns probably become stub due to the large size of the cross section site. In this paper, the necessity of limiting axial compression ratio and probability of enlarging the ratio limit are discussed. Based on the test results of reinforced concrete columns with compound spiral stirrups, the limit of axial compression ratio of the code for aseismic design of building structures(GBJ11—89) may be enlarged. The cross section site may be reduced and the aseismic behavior of frame columns improved.