摘要
型钢混凝土T形柱截面不规则,沿腹板和翼缘两个主轴方向的受力性能差异较大。为研究实腹式型钢混凝土T形柱沿翼缘方向的抗震性能,对10个缩尺比为1∶2不同参数下的T形柱进行了水平加载试验。考虑了加载制度、轴压比和配钢率的影响,观察了T形柱的受力过程,分析其破坏形态及水平荷载-位移曲线、承载力、刚度、侧移角、延性、耗能能力等抗震性能指标。在此基础上,采用OpenSees对T形柱进行了有限元模拟,计算结果与试验结果吻合较好,进而分析了型钢的应力变化规律和P-δ效应对滞回性能的影响。结果表明:地震作用下,剪跨比为2.5的实腹式型钢混凝土T形柱沿翼缘方向发生弯曲破坏;不同的加载制度下,T形柱呈现出不同的破坏形态;滞回曲线饱满、对称、呈梭形,承载力稳定,耗能能力强;位移延性系数均大于5,破坏时侧移角介于1/16~1/10,显示出良好的延性和抗倒塌能力;加载循环次数越多,T形柱的延性越差;轴压比越大,刚度退化越快,延性和耗能能力越差;配钢率越大,T形柱的刚度退化越缓慢,延性和耗能能力变化较小;P-δ效应使得试件的承载力降低,但耗能能力发挥更充分。
Steel reinforced concrete T-shaped column has irregular cross section, resulting in different mechanical performances along web and flange directions. In order to study the seismic behavior of steel reinforced concrete T-shaped columns, ten specimens with a scaling ratio of 1/2 were tested under horizontal loading along flange, with consideration of the influences of loading procedure, axial compression ratio and steel ratio. The failure process was observed. The failure patterns and seismic behaviors, such as horizontal load-displacement curves, strength, stiffness, drift angle, ductility and energy dissipation capacity, were analyzed. Based on the experimental study, finite element analysis was carried out by using OpenSees. The simulation results agreed well with the experimental results. The variation of steel stress and the influence of the P-δ effect on hysteresis performance were analyzed. The results show that the flexural failure is observed for the specimens with a shear span ratio of 2.5 under the earthquake, but the specimens with different loading procedures have different failure patterns. The hysteretic loops are plump, symmetric and fusiform. The specimens have stable strength and strong energy dissipation capacity. The displacement ductility coefficients are larger than 5 and the drift angles are between 1/16 and 1/10, indicating good ductility and anti-collapse capacity. With the increase of loaded cycles, the ductility of the specimen is reduced. With the increase of axial compression ratio, the stiffness of the specimen degenerates significantly, and the ductility and energy dissipation are worse. With the increase of steel ratio, the stiffness of specimen degenerates more gradually and the ductility and the energy dissipation capacity changes insignificantly. The P-δ effect is harmful for the strength of the specimen but helpful for the energy dissipation.
作者
刘祖强
李雅婷
薛建阳
周超锋
LIU Zuqiang;LI Yating;XUE Jianyang;ZHOU Chaofeng(School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi’an 710055,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2020年第11期29-40,共12页
Journal of Building Structures
基金
国家自然科学基金项目(51308444)
陕西省创新人才推进计划-科技创新团队项目(2019TD-029)
陕西省留学人员科技活动择优资助项目(2019021)
作者简介
刘祖强,出生于1984年,男,工学博士,副教授,主要从事钢与混凝土组合结构及工程结构抗震研究。email:liuzuqiang0081@126.com
