三重螺旋筋约束混凝土柱承载力影响参数分析  

Parametric study of the axial compressive bearing capacity of reinforced concrete column confined by triple spiral stirrups

作　　者：覃龙寿 陈健伟 莫琳琳 周济 陈宗平[2,4] QIN Long-shou;CHEN Jian-wei;MO Lin-lin;ZHOU Ji;CHEN Zong-ping(Guangxi Hualan Engineering Management Co.,Ltd.,Nanning 530012,China;School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;School of Civil Engineering and Architecture,Nanning University,Nanning 530200,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Nanning 530004,China)

机构地区：[1]广西华蓝工程管理有限公司,广西南宁530012 [2]广西大学土木建筑工程学院,广西南宁530004 [3]南宁学院土木与建筑工程学院,广西南宁530200 [4]工程防灾与结构安全教育部重点实验室,南宁530004

出　　处：《广西大学学报（自然科学版）》2022年第6期1413-1423,共11页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金项目(51578163);广西八桂学者专项研究项目([2019]79号);广西科技基地与人才专项(桂科AD21075031);中央引导地方科技发展资金项目(桂科ZY21195010);广西重点研发计划(桂科AB21220012)。

摘　　要：为了研究内部横向钢筋约束效应及柱截面尺寸等关键设计参数对三重螺旋箍筋约束混凝土圆柱极限承载力的影响,基于三重螺旋箍筋约束混凝土圆柱的精细化弹塑性有限元模型,就各变化参数对其极限承载力的影响规律进行了深入的参数分析。结果表明:混凝土强度等级较低时减小螺旋箍筋间距能显著提高三重螺旋箍筋约束混凝土圆柱的极限承载力;相同体积配箍率下,随着试件截面直径的增加,最内层螺旋箍筋对试件承载力的提升效果逐渐减小;中间层螺旋箍筋体积配箍率大于最内层时,三重螺旋箍筋约束混凝土圆柱极限承载力的提高更为显著;中间层螺旋箍筋相对侧向应力与极限承载力之间的相关性更强。In order to investigate the influence of parameters such as transverse steel confinement effect and section size on the axial ultimate bearing capacity of concrete columns confined by triple spiral stirrups,based on a refined finite element model,the effect of key design parameters on the bearing capacity of triple spiral stirrup-confined columns were analyzed in depth.The results show that low concrete compressive strength and small spacing of spiral stirrup can significantly improve the ultimate bearing capacity of triple spiral stirrup-confined columns.The effect of the inner spiral stirrup on the improvement of load bearing capacity becomes insignificant with increasing section diameter of specimen.When the volumetric ratio of middle layer spiral stirrup is greater than that of the innermost layer,the ultimate bearing capacity would be improved more significantly.The correlation between the relative lateral stress of middle layer spiral stirrup and the ultimate bearing capacity is stronger.

关 键 词：三重螺旋箍筋 钢筋混凝土圆柱 极限承载力 复合约束 有限元分析 

分 类 号：TU528[建筑科学—建筑技术科学]