双肢冷弯薄壁型钢框架抗震性能分析
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摘要
冷弯薄壁型钢住宅结构在国内已经成为研究和应用的热点。针对双肢冷弯薄壁C形钢加垫板连接的新型截面,将其应用于低层住宅框架结构,通过拟静力试验和有限元模拟相结合的方法,对3个单层单跨框架进行低周循环荷载作用下的抗震性能对比研究,考虑柱轴压比和梁柱节点连接螺栓间距这两个参数,深入研究了框架的破坏形式以及表征结构抗震性能的各项指标,包括承载力退化、刚度退化、延性及耗能性能。研究结果表明:各框架最终均因发生平面内整体失稳而破坏,且伴有梁端板件及柱脚腹板的局部失稳。螺栓间距对承载力退化的影响程度较大,而轴压比则主要是影响结构的刚度退化性能,各框架较一般混凝土结构及轻型门式刚架结构均表现出较好的延性与耗能性能。研究结论对这一截面形式的应用发展具有一定的实际意义。
Cold-formed thin-wall steel structures have become more and more popular in China.In this paper,a new type of coldformed thin-wall double-C steel with gusset plate is used in low-rise residential frame structures.The seismic behavior of three single-story and single-span frames is studied through both pseudo-static tests and finite element analysis.Two influencing factors,including axial compression ratio of column and bolt pitch of beam-column connections,are also considered in the study.The failure modes of frame and indexes of seismic behavior are studied,including bearing capacity degradation,rigidity degradation,ductility and energy dissipation.The results indicate that the failure modes of the frame are in-plane buckling with local buckling at the beam end and the web of column base.The bolt pitch has a larger influence on bearing capacity degradation,while the axial compression ratio has a larger influence on stiffness degradation.The ductility and energy dissipation capacity of this structure are better than those of conventional concrete structures and light portal-framed structures.The research in this paper can provide a reference for the application and development of cold-formed thin-wall steel structures.
引文
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