多螺旋复合箍筋约束混凝土方柱轴压承载力计算  

Calculation of axial compression bearing capacity of concrete square columns confined by multi-spiral composite stirrups

作　　者：杨坤[1] 胡阳阳 孙珊珊[1] 高晓敏 吉康乐 YANG Kun;HU Yangyang;SUN Shanshan;GAO Xiaomin;JI Kangle(School of Civil Engineering,Chang an University,Xi an 710061,Shaanxi,China;XAUAT Engineering Technology Co.,Ltd.,Xi an 710055,Shaanxi,China;China Construction Sixth Engineering Bureau Civil Engineering Co.,Ltd.,Tianjin 300457,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]西安建筑科大工程技术有限公司,陕西西安710055 [3]中建六局土木工程有限公司,天津300457

出　　处：《建筑科学与工程学报》2025年第2期58-66,共9页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51708035);陕西省自然科学基础研究计划项目(2021JM-177)。

摘　　要：为研究多螺旋复合箍筋约束混凝土方柱的轴心受压承载力,对7根该类型短柱进行了轴心受压试验,分析了箍筋间距、箍筋形式、箍筋强度对其轴压性能的影响。考虑到矩形外箍、圆螺旋内箍以及外围圆螺旋箍内的混凝土圆柱体对核心混凝土的多重约束作用,对多螺旋复合箍筋的约束机理进行了分析。基于双剪统一强度理论,推导出多螺旋复合箍筋约束混凝土方柱的轴心受压承载力计算公式,并与试验结果、已有规范及学者提出的计算公式进行对比。结果表明:随着箍筋间距的减小或者箍筋强度的提高,多螺旋箍筋约束混凝土试件的强度和延性均提高;多螺旋复合箍筋的约束效果好于传统井字形复合箍筋,且五螺旋复合箍筋的约束效果好于四螺旋复合箍筋;提出的轴压承载力计算公式精度较高,验证了统一强度理论在多螺旋复合箍筋约束混凝土方柱轴压承载力计算中的适用性;相比矩形外箍,圆螺旋内箍的间距与强度对约束混凝土方柱轴压承载力提高幅度的影响更为明显。In order to study the axial compression bearing capacity of concrete square columns confined by multi-spiral composite stirrups,an axial compression experimental study including 7 short columns of this type was carried out.The effects of stirrup spacing,stirrup form and stirrup strength on the axial compression bearing capacity of the columns were discussed.Considering the multiple confinement effect of rectangular outer hoop,circular spiral inner hoop and the concrete cylinder surrounded by outer spiral stirrups on core concrete,the confinement mechanism of multi-spiral composite stirrup was analyzed.Based on the twin shear unified strength theory,the calculation formula of axial compression bearing capacity of concrete square columns confined by multi-spiral composite stirrups was derived and compared with the test results,existing national regulation and the calculation formulas proposed by scholars.The results show that the strength and ductility of multi-spiral stirrup confined concrete specimens increase with the decrease of stirrup spacing or the increase of stirrup strength.The constraint effect of multi-spiral composite stirrups is better than that of traditional cross-shaped composite stirrups,and the constraint effect of five-spiral composite stirrups is better than that of four-spiral composite stirrups.The proposed formula for calculating axial compressive capacity is of high accuracy,which verifies the applicability of the unified strength theory in the calculation of axial compression bearing capacity of concrete square columns confined by multi-spiral composite stirrups.Compared with the rectangular outer hoop,the spacing and strength of the circular spiral inner hoop have a more obvious effect on the increase of axial compression bearing capacity of the confined concrete square column.

关 键 词：多螺旋复合箍筋 双剪统一强度理论 轴压承载力 试验研究 理论计算方法 

分 类 号：TU375.3[建筑科学—结构工程]