轴向荷载下双层箍筋混凝土柱的力学性能分析*
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（1 河北大学建筑工程学院， 保定 071000； 2 温州大学建筑工程学院， 温州 325000）
［摘要］为减小钢筋混凝土柱的截面尺寸并改善其延性，试验设计9根双层箍筋约束混凝土柱和3根单层箍筋柱。以箍筋约束混凝土柱为研究对象进行轴向加载试验，根据试验结果提出双层箍筋约束混凝土柱峰值荷载的理论计算公式；试验通过对比各组试件的荷载-应变曲线，定性地分析了配箍特征值对双层箍筋约束混凝土柱延性的影响，并得到构件的应变延性系数在1.24～2.70之间；通过分析横向变形系数与轴向应变的关系曲线，揭示了试件的破坏机理。［关键词］双层箍筋; 峰值荷载; 延性系数; 横向变形系数中图分类号：TU375 文献标识码：A 文章编号：1002-848X(2016)04-0091-06
Mechanical properties analysis of concrete column confined with double-layer stirrups under axial loadsZhang Yaoyue1, Sun Linzhu2, Li Yunyang1, Zhao Junliang2, Yang Changmin1（1 College of Civil Engineering and Architecture, Hebei University, Baoding 071000, China; 2 College of Civil Engineering and Architecture, Wenzhou University, Wenzhou 325000, China）Abstract:For reducing the section size of reinforced concrete column and improving its ductility, 9 concrete columns confined with double-layer stirrups and 3 concrete columns confined with single-layer stirrups were designed. Concrete columns confined with stirrups were taken as the research object and the axial loads tests were conducted. The theoretical calculation formula of peak load for concrete columns confined with double-layer stirrups were put forward according to the test results. By comparing the load-strain curves of the test specimens, a qualitative analysis of the influence of stirrup characteristic value on ductility of concrete columns confined with double-layer stirrups was carried out, and component strain ductility coefficient was between 1.24～2.70. The failure mechanism of specimens was revealed through the analysis of the relationship curves of poisson ratio and axial strain.Keywords:double-layer stirrups; peak load; ductility factor; poisson ratio
*国家自然科学基金（51178356,51308419），浙江省自然科学基金（LQ13E080005）。
作者简介：张耀跃，硕士研究生，Email：604751817@qq.com。
