摘要
为研究冷弯薄壁型钢-轻骨料混凝土T形截面柱的抗震性能,设计并完成了6个冷弯薄壁型钢-轻骨料混凝土T形截面柱的低周往复加载试验,考虑了轴压比(0.2、0.3)、含钢率(5.12%、10.15%)和加载方向(沿翼缘、腹板加载)的影响,分析其破坏形态和抗震性能指标。结果表明:该类T形截面柱最终破坏均呈现压弯破坏,但不同加载方向下的破坏形态不同;T形截面柱滞回曲线饱满,承载力稳定;层间位移角介于1/42~1/24,平均位移延性系数介于4.6~6.6,破坏时等效黏滞阻尼系数介于0.321~0.516,表现出优异的变形和耗能能力;随轴压比增大,T形截面柱延性和耗能能力变差,承载力和刚度退化加快;随含钢率增大,承载力、延性和耗能能力提升,刚度退化变缓;相较于沿腹板加载,沿翼缘加载时承载力有所降低,但刚度退化较为平缓,变形、耗能能力更优。考虑柱破坏主要发生在与水平加载方向平行的柱肢,故保留主要受力柱肢,简化或忽略次要受力柱肢,将T形截面转化为矩形截面,提出正截面承载力计算公式,计算结果与试验结果吻合较好,误差小于20%。
To study the seismic performance of cold-formed thin-walled steel-lightweight aggregate concrete Tcolumns,six specimens were designed and tested under low-cycle reversed loading,considering the effects of axial compression ratios(0.20.3),steel ratios(5.12%10.15%),andloading directions(loading along the web or the flange).The damage patterns and seismic performance indices were analyzed.The results show that the final damage pattern of these T-shaped columns presentes compression-bending failure,but the failure modes under different loading directions are different.The hysteresis curve of the T-shaped columns is full,and the bearing capacity is stable.The inter-story displacement angles range from 1/42 to 1/24,the average ductility coefficients range from 4.6 to 6.6,and the equivalent viscous damping coefficients at failure range from 0.321 to 0.516,demonstrating excellent deformation and energy dissipation capabilities of the specimens.As the axial compression ratio increases,the ductility and energy dissipation capacity of T-shaped columns deteriorate,and the degradation of bearing capacity and stiffness accelerates.As the steel ratio increases,the bearing capacity,ductility,and energy dissipation capacity of the specimens increase,and the stiffness degradation slows down.Compared to loading along the web,loading along the flange results in a decreased bearing capacity but a smoother stiffness degradation and a higher deformation energy dissipation capacity.The failure of cold-formed thin-walled steel lightweight aggregate concrete T-columns mainly occurs in the column limbs parallel to the horizontal loading direction.Therefore,the main bearing column limb is simplified to a rectangular section by omitting the secondary bearing column limb and retaining the primary one.A formula for calculating the normal section bearing capacity was then proposed.The calculated results are in good agreement with the test results,with an error of less than 20%.
作者
李补拴
张坤
陈明
孟彬
周伟
LI Bushuan;ZHANG Kun;CHEN Ming;MENG Bin;ZHOU Wei(School of Civil Engineering,Inner Mongolia University of Science&Technology,Baotou O14010,China;School of Materials Science and Engineering,Inner Mongolia University of Science&Technology,Baotou O14010,China;Inner Mongolia Key Laboratory of Safety and Durability for Civil Engineering,Baotou O14010,China;Beijing Engineering Research Center of High-Rise and Large-Span Prestressed Steel Structures,Beijing University of Technology,Beijing 100124,China)
出处
《建筑结构学报》
北大核心
2025年第11期195-206,222,共13页
Journal of Building Structures
基金
内蒙古自治区自然科学基金项目(2023QN05029)
内蒙古自治区直属高校基本科研业务费专项(2024QNJS067)
国家自然科学基金项目(521068024)
中央支持地方高校改革发展项目(0404052507)。
关键词
T形截面柱
冷弯薄壁型钢
轻骨料混凝土
拟静力试验
抗震性能
正截面承载力
T-shaped column
cold-formed thin-walled steel
lightweight aggregate concrete
quasi-static test
seismic performance
normal section bearing capacity
