摘要
为研究方钢管螺旋筋约束自密实高强混凝土柱的抗震性能,以轴压比、剪跨比、有无配制螺旋筋以及螺旋筋间距作为设计参数,进行了7个试件的低周反复加载试验,获取了各试件的滞回曲线以及应变分布。试验结果表明:试件破坏特征主要为方钢管柱脚区域出现明显鼓曲形成塑性铰区域;随轴压比的提高,试件抗剪承载力、环线刚度和耗能能力均有提升,剪跨比对试件抗震性能的影响规律不明显。配制螺旋筋对峰值承载力和刚度的影响较小,而对试件延性及耗能的提升明显,与无配筋试件相比试件延性平均提升了15.4%,耗能平均提升了114.9%。螺旋筋间距越密对试件抗震性能提升效果更优;适当增大轴压比,控制剪跨比在5以内以及增设螺旋筋对提升其承载能力和变形能力有积极作用。
To investigate the seismic behavior of square steel tube spiral reinforced confined self-compacting high-strength concrete columns,low-cycle repeated loading tests were carried out on 7 specimens with axial compression ratio,shear-span ratio,presence or absence of spiral reinforcement,and spacing of spiral reinforcement as design parameters.The hysteresis curves and strain distribution were obtained.The results showed that the failure patterns of the specimens were mainly the appearance of bulges at the foot of the column,forming a plastic hinge zone.With the increase of axial compression ratio,the seismic capacity,stiffness,and energy dissipation capacity of the specimens all increased,while the influence of shear-span ratio on the seismic behavior of the specimens was not significant.The effect of spiral reinforcement on ultimate bearing capacity and stiffness was relatively small,but it can improved the ductility and energy dissipation of the specimens.Compared with specimens without spiral reinforcement,the ductility and energy dissipation of the specimens on average increased by 15.4%and 114.9%,respectively.The closer the spacing of the spiral reinforcement,the better the effect on improving the seismic performance of the specimens.Appropriately increasing the axial compression ratio,controlling the shear-span ratio within 5,and adding spiral reinforcement have a positive effect on improving their bearing and deformation capacity.
作者
陈祥花
徐炜圣
梁莹
陈宗平
CHEN Xianghua;XU Weisheng;LIANG Ying;CHEN Zongping(Urban-rural Construction College,Guangxi Agricultural Vocational University,Nanning 530007,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;College of Architecture and Civil Engineering,Nanning University,Nanning 530200,China)
出处
《混凝土》
CAS
北大核心
2024年第5期67-74,81,共9页
Concrete
基金
国家自然科学基金(51578163)
广西高校中青年教师科研基础能力提升项目(2023KY1225)
广西农业职业技术大学科学研究与技术开发计划课题(YKJ2206)。
关键词
方钢管
螺旋筋
自密实高强混凝土
柱
抗震性能
square steel tube
spiral reinforcement
self compacting high strength concrete
columns
seismic behavior
