摘要
设肋L形钢管混凝土柱作为建筑结构角柱,受到双向荷载作用。为了研究不同加载角度下L形钢管混凝土柱的偏压性能,进行了9个设肋L形钢管混凝土柱和1个无肋对比柱的偏压性能试验研究,试验参数为加载角度(0°、45°、135°、180°和225°)、荷载偏心率(0、0.25、和0.5)和构件长细比(31.5和41.9)。研究结果表明:设肋L形钢管混凝土柱在不同加载角度下具有良好的压弯性能;加载角度对设肋L形钢管混凝土柱的承载力影响较大,135°加载角下的承载力最高,45°加载角下的承载力最低,设肋L形钢管混凝土柱加载角度对承载力的影响相差最大可达24%;加载角度为225°时,相对于无肋截面形式,设置纵向加劲肋可使L形钢管混凝土柱的承载力提高约12%;偏心率对设肋L形钢管混凝土承载力的影响较大,当偏心率为0时,长细比对承载力影响不大,当偏心率为0.25时,长细比对承载力的影响增大,相差可达11%左右。
Stiffened L-shaped concrete-filled steel tubular(CFST)columns are often used as corner columns and subjected to bidirectional loads.In order to study their mechanical behavior under eccentric compressive loads with different loading angles.The behavior of nine stiffened and one unstiffened L-shaped CFST specimens were experimentally investigated.The test parameters were loading angle(0°,45°,135°,180°and 225°),load eccentricity(0,0.25 and 0.5),and slenderness ratio(31.5 and 41.9).The test results show that,the stiffened L-shaped CFST members have good compressive and bending behavior at different loading angles.The loading angle has a great effect on the ultimate strength of the specimens.The ultimate strength is the highest when the loading angle is 135°while the lowest when the loading angle is 45°.The difference caused by the loading angle is up to 25%.Compared with the unstiffened CFST column,the ultimate strength of the stiffened members can be increased by about 12%when the loading angle is 225°.The load eccentricity has a considerable effect on the ultimate strength of stiffened L-shaped CFST columns.The slenderness ratio has little effect on the ultimate strength for the specimen with the eccentricity of 0,while it has a larger effect on the ultimate strength for the specimen with the eccentricity of 0.25,in this case the difference caused by the slenderness ratio is about 11%.
作者
郑永乾
曾少昔
ZHENG Yongqian;ZENG Shaoxi(Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fujian University of Technology,Fuzhou 350118,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2021年第S02期264-270,共7页
Journal of Building Structures
基金
国家自然科学基金项目(51678151)
福建省自然科学基金项目(2019J01780)
关键词
L形钢管混凝土柱
设肋
加载角度
偏心率
偏压试验
承载力
L-shaped concrete-filled steel tube column
stiffened member
loading angle
load eccentricity
eccentric compressive test
bearing capacity
作者简介
郑永乾,出生于1979年,男,工学博士,教授,主要从事组合结构研究。email:yongqianzheng@163.com
