带垫板的双肢C型钢框架抗震性能研究

冷弯薄壁C型钢作为结构的承重构件，建造多层轻型房屋，其抗震、保温等性能优于传统土木结构建筑。选取带垫板的双肢C型钢框架结构为研究对象, 采用理论、试验和有限元相结合的方法，考虑框架的自振周期、阵型、内力及层间侧移等特性，分析不同节点刚性下框架的能力谱、塑性铰分布、出铰顺序等抗震性能，适合该框架结构的侧向荷载分布形式，解决该框架的水平荷载分配问题。研究C型钢型号、节点板厚度、螺栓间距、构件长细比和轴压比等因素对框架的破坏机理、破坏特征、滞回性能、延性、刚度退化和极限承载力等抗震性能的影响。对比ANSYS微观结构模型和宏观结构模型，提出一种适用于罕遇地震的实用分析方法。考量蒙皮效应和支撑体系对框架刚度的贡献，可以为实际工程设计中减少支撑设置提供可靠的依据。

The seismic behavior and thermal insulation performance of double C steel with gusset plate used for the structure's load-bearing components to build multi-storey and light-duty housing is superior to the ones of traditional civil structure construction. The frame structure of double C steel with gusset plate was studied by combing the methods of theoretical analysis, experiment and finite element simulation. Considered the influencing factors of natural vibration period, formation, inner force and inter-story lateral displacement of the frame, the anti-seismic performance of capacity spectrum, plastic hinge distribution, the hinge sequence under different joint rigidity and the lateral load distribution are studied, and the horizontal load distribution of frame are solved. The impacts of C steel model, gusset plate thickness ,bolt spacing, component slenderness ratio and axial compression ratio on failure mechanism, failure characteristics, hysteretic performance, ductility, stiffness degradation and ultimate bearing capacity were studied. Compared ANSYS models of microstructure with macrostructure models, a kind of practical analysis method applied to rare earthquake was proposed. Considered the contribution of the diaphragm effect and supporting system to frame stiffness, it could provide a reliable basis on reducing supports for practical engineering design.