摘要
为研究高延性混凝土(HDC)加固震损装配式企口连接框架梁的抗震性能,对1个震损框架梁和3个震损装配式框架梁采用HDC加固,通过低周反复加载试验,分析其破坏形态及抗震性能。结果表明:HDC对震损框架梁形成良好的约束,可有效抑制混凝土表面裂缝的开展和延伸;HDC加固后震损框架梁的承载力较原装配式框架梁的提高66.7%、位移延性系数提高88%、累积耗能提高12.1%,震损装配式框架梁的抗震性能可基本得到恢复,同时均可改善原结构脆性破坏特性;连接部位设置侧向钢板和底部钢板均对装配式框架梁的刚度和承载力等有显著影响。基于试验破坏特征,采用拉压杆模型计算震损装配式企口连接框架梁的受剪承载力,计算结果与试验结果吻合良好。
In this paper,an experimental study was conducted involving one earthquake-damaged frame beam and three earthquake-damaged prefabricated frame beams to investigate the seismic performance of earthquake-damaged prefabricated groove connection frame beams reinforced with high ductility concrete(HDC).The beams were subjected to low-cyclic reversed loading tests to analyze the failure modes and seismic performance.The results show that HDC forms a constraint effect to effectively restrain the cracking and damage component.The bearing capacity of the HDC-reinforced earthquake-damaged frame beam increases by 66.7%,the displacement ductility coefficient increases by 88%,and the cumulative energy dissipation increases by 12.1%compared to the original prefabricated frame beam.These improvements demonstrate that the seismic performance of earthquake-damaged prefabricated groove frame beams can be substantially restored,while also enhance the brittle failure characteristics of the original structure.Additionally,the presence of lateral and bottom steel plates significantly influences the stiffness and bearing capacity of the prefabricated groove frame beams.Based on the observed failure characteristics,the shear capacity of the earthquake-damaged prefabricated groove frame beams was calculated using a tension-compression bar model,and the calculated results were found to be in good agreement with the experimental outcomes.
作者
寇佳亮
马铭
曹蓝月
周恒
KOU Jialiang;MA Ming;CAO Lanyue;ZHOU Heng(School of Civil Engineering&Architecture,Xi’an University of Technology,Xi’an 710048,China;State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi’an University of Technology,Xi’an 710048,China;Northwest Engineering Co.,Ltd,Power China,Xi’an 710065,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2024年第12期84-96,共13页
Journal of Building Structures
基金
国家自然科学基金项目(52079109,51408487)
陕西省自然科学基础研究计划(2024JC-YBMS-425)。
关键词
震损装配式企口连接框架梁
高延性混凝土
低周反复加载试验
耗能能力
变形能力
earthquake-damaged prefabricated groove frame beam
high ductile concrete(HDC)
low-cyclic reversed loading test
energy dissipation capacity
deformation capacity
