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赵根田1，鉴钟2
( 1．内蒙古科技大学建筑与土木工程学院，内蒙古包头014010; 2．包头钢铁( 集团) 公司设计研究院，内蒙古包头014010)
关键词: 冷弯; 薄壁型钢; 框架; 抗震性能
中图分类号: TU392. 1 文献标识码: A
摘要: 对冷弯薄壁C 型钢框架进行试验研究，共设计3 榀框架，梁柱皆采用C 型钢作为主要承重构件，截面形式为双肢C 型钢背靠背，双肢C 型钢由节点板和高强螺栓连接而成．试验主要研究螺栓间距和轴压比两因素对整体框架抗震性能的影响，得到框架在低周反复循环荷载下的滞回曲线、骨架曲线与应变分布情况，对框架的破坏机理、承载力退化、刚度退化、延性以及耗能性能进行研究，并分析各参数变化对试件抗震性能的影响．结果表明: 试件的破坏形式均为平面内失稳，两侧梁端及柱脚腹板位置出现局部失稳．螺栓间距对承载力退化影响较大，而轴压比是影响刚度退化的主要因素，框架的延性系数、耗能性能高于一般混凝土结构和其他轻钢结构．
Ｒesearch on seismic behavior of cold-formed thin-walled C steel frame system
ZHAO Gen-tian1，JIAN Zhong2
( 1． Architecture and Civil Engineering School，Inner Mongolia University of Science and Technology，Baotou 014010，China; 2． Design
Institute，Baotou Iron and Steel( Group) Co．，Baotou 014010，China)
Key words: cold-formed steel frame; seismic behavior
Abstract: The experimental study of cold-formed thin-walled C steel was carried out in which single span frame，beam and column were used as principal load bearing members． The type of the section is the back to back connected style of double cold-formed thin-walled C steel，which is linked by gusset plate and high-strength bolt． Focused on the tow influencing factors，the influence of bolt pitch and axial compression ratio on seismic behavior of overall framework were tested． The failure mechanism，strength deterioration，stiffness degradation，ductility and dissipation capacity of the frame were researched in order to get the scenario noun of hysteretic curves and skeleton curve and strain distribution on low repeated and reciprocal loading． The results reveal that all of the failure modes from the specimen are of unstability in load plane and local buckling at tow sides of beam end and column base web． Bolt pitch has a greater impact on strength deterioration． Axial compression ratio has a greater impact on stiffness degradation． The ductility coefficient of the frame and dissipation capacity of the specimen are higher than those of the concrete structure and general light steel structure．