摘要
为研究铝合金管螺旋筋海水海砂混凝土组合短柱的轴压性能,以螺旋筋与纵筋截面配筋率之比(0.55、1.02、2.20、4.01)、螺旋筋直径(6、8、10 mm)与间距(40~210 mm)、纵筋数量(2、4、6、8)与直径(6、8、10、14 mm)为变化参数,对16根该类组合短柱和1根铝合金管海水海砂混凝土短柱进行轴心受压试验,观察其受力破坏过程及形态,获取荷载-位移曲线和性能特征点,分析各变化参数对组合短柱承载力、轴压延性和耗能能力的影响。结果表明:构件的破坏过程相似且均为剪切破坏,但组合短柱的轴压承载能力和变形能力更优;在相同钢筋含量下,组合短柱的承载力、轴压延性和耗能能力随螺旋筋与纵筋截面配筋率之比增大呈先增大后减小的趋势;螺旋筋与纵筋截面配筋率之比为2.2时构件的轴压性能最优,其中,螺旋筋“细且密”或纵筋“少且粗”的构件拥有更高的承载力、轴压延性和耗能能力,建议通过调整螺旋筋直径与间距获取理想的轴压性能。针对铝合金管螺旋筋海水海砂混凝土组合短柱推导了轴压承载力计算式,其平均计算误差仅为1%。
To investigate the axial compressive behavior of spirally reinforced seawater sea-sand concrete-filled aluminum alloy tube stub columns(ASSCs),16 ASSC specimens and one seawater sea-sand concrete-filled aluminum alloy tube column were designed for axial compression loading test,and test parameters included the ratio of spiral stirrup to longitudinal reinforcement(0.55,1.02,2.20,4.01),the diameter(6,8,10 mm)and spacing(40-210 mm)of spiral stirrup and the number(2,4,6,8)and diameter(6,8,10,14 mm)of longitudinal reinforcement.The failure mode,axial load-deformation relationship,characteristic points and the influences of test parameters on bearing capacity,axial ductility and energy dissipation capacity were presented and analyzed.The results show that the failure process of the above columns is similar and both are shear failure,but ASSC has better axial compression bearing capacity and deformation capacity.The bearing capacity,ductility and energy dissipation capacity of ASSC increase first and then decrease with the increase of ratio of spiral stirrup to longitudinal reinforcement.The axial compressive behavior of specimens is the best when the ratio is 2.2,and specimens with thin and dense spiral stirrups or few and thick longitudinal reinforcements have higher ultimate bearing capacity,ductility and energy dissipation capacity.It is suggested to adjust the diameter and spacing of spiral stirrup to obtain ideal axial compression performance.The axial compression capacity formula derived for ASSC has high calculation accuracy with an average error of 1%.
作者
陈宗平
宋春梅
莫琳琳
周济
CHEN Zongping;SONG Chunmei;MO Linlin;ZHOU Ji(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;College of Civil Engineering and Architecture,Nanning University,Nanning 530200,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning 530004,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2024年第2期136-147,共12页
Journal of Building Structures
基金
国家自然科学基金项目(51578163)
中央引导地方科技发展资金项目(桂科ZY21195010)
八桂学者专项研究([2019]79号)
广西科技基地与人才专项(桂科AD21075031)。
关键词
铝合金管
螺旋筋
海水海砂混凝土
静力试验
轴压性能
承载力计算
aluminum alloy tube
spiral strrup
seawater sea-sand concrete
static test
axial compressive behavior
bearing capacity calculation
