摘要
为了研究碳纤维布加固震损钢管混凝土柱-钢梁框架节点的抗震性能,按1:2的缩尺比例设计并制作4个方钢管混凝土柱-钢梁框架边节点试件,进行了预损加载、碳纤维布加固和节点加固后的低周往复荷载破坏试验。研究了碳纤维布加固震损节点的有效性,探讨了不同震损程度对加固效果的影响。通过对节点试件的滞回曲线、骨架曲线、碳纤维布应变、延性、耗能能力、刚度退化及承载力退化等参数分析可知:碳纤维布加固方钢管混凝土柱-钢梁框架边节点,保证了"强柱弱梁"的抗震延性设计目标的实现,破坏形态均为钢梁弯曲破坏;碳纤维布加固提高了节点试件承载力,抗震性能得到明显改善;在一定损伤程度情况下,加固节点恢复并超过受损前的抗震性能。
In order to study the seismic behavior of CFRP-reinforced seismic-damaged joints in composite frame consisting of concrete-filled square steel tubular（CFSST） columns and steel beams,four one half scaled models of exterior joints in composite frame consisting of CFSST columns and steel beams were designed and manufactured.The test consisted of pre-damage loading,rehabilitation with CFRP and destruction tests under lateral cyclic loading.The effectiveness of CFRP-strengthened seismic-damaged joints and the reinforcement effect on different levels of seismic damage were studied.Based on the test data,the hysteretic loops,skeleton curves,the CFRP strain,ductility,dissipative ability,ultimate strength and stiffness degradation,etc.were obtained.Results show that CFRPstrengthened seismic-damaged exterior joints in composite frame consisting of CFSST columns and steel beams meets the strong column-weak beam requirement of seismic design,and the failure modes of all joints are bending failure of beam.The reinforcement with CFRP has a significant on increasing the ultimate capacity and the seismic behaviors of the joints.The study indicates the rehabilitated joints can reach or even exceed the level of their original seismic performances before seismic damage in a certain extent of damage level.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2014年第11期69-76,共8页
Journal of Building Structures
基金
国家自然科学基金项目(51178057)
湖北省高等学校优秀中青年科技创新团队计划项目(T201303)
关键词
方钢管混凝土-钢梁节点
碳纤维布加固
拟静力试验
地震损伤
抗震性能
concrete-filled square steel tubular column-steel beam frame joint
carbon fiber reinforced polymerstrengthening
quasi-static test
seismic damage
seismic behavior
