摘要
为研究多重螺旋筋复合约束钢筋混凝土圆形截面短柱的轴压力学性能,以螺旋筋间距、钢筋笼间距、螺旋筋重数为变化参数,对8个短柱试件进行轴心受压试验。观察试件的破坏过程及形态,获得了其荷载-变形曲线、峰值荷载和峰值变形等力学性能指标,并分析不同变化参数对试件轴压力学性能的影响。研究结果表明:三重螺旋筋复合约束钢筋混凝土短柱的破坏过程及形态与两重螺旋筋复合约束钢筋混凝土短柱相似,但具有更大的初始压缩刚度和更好的延性和耗能能力,用钢量的增加并没有有效提高其承载力;增大螺旋筋间距,减少用钢量的同时并没有显著降低承载力,而峰值变形、初始压缩刚度、延性及耗能系数逐渐减小;增大钢筋笼间距,用钢量的减少幅度大于承载力的降低幅度,其延性及耗能能力得到提高,而峰值变形和初始压缩刚度没有表现出明显的规律。
In order to study the axial compression behavior of composite confined reinforced concrete circular column with multiple spiral stirrups,a total of 8 specimens were tested under axial compression.Three parameters including spiral stirrup spacing,steel cage spacing and number of spiral stirrups were taken into consideration.The failure process and mode of specimens were observed,and the load-deformation curve,peak load,and peak deflection were obtained.Furthermore,the effects of different parameters on axial compression behavior were analyzed.The results showed that the failure process and mode of circular columns with triple spiral stirrups were similar to those of circular columns with double spiral stirrups under axial compression.It had greater initial compression stiffness and better ductility and energy dissipation capacity,but increasing the amount of steel did not effectively improve its bearing capacity.Increasing the spacing of spiral stirrup could significantly reduce the steel consumption without significantly reducing the bearing capacity,while the peak deformation,initial compression stiffness,ductility and energy dissipation gradually decreased.With the increase of steel cage spacing,the reduction of steel consumption was greater than that of bearing capacity,and the ductility and energy dissipation capacity were improved,but the peak deformation and initial compression stiffness had no obvious regularity.
作者
熊海明
梁厚燃
梁莹
陈宗平
XIONG Haiming;LIANG Houran;LIANG Ying;CHEN Zongping(Guangxi Hualan Engineering Management Company Limited,Nanning 530012,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Nanning 530004,China)
出处
《工业建筑》
CSCD
北大核心
2020年第1期84-90,共7页
Industrial Construction
基金
国家自然科学基金项目(51578163)
八桂学者专项研究项目(【2019】79号)
关键词
多重螺旋筋
复合约束
钢筋混凝土
轴压试验
multiple spiral stirrups
composite confined
reinforced concrete
axial compression test
