北京大兴国际机场航站楼大跨度钢结构的最大结构单元长度504 m，最大跨度125 m，属于超长超限大跨度建筑结构，该结构的特点是8个C型非对称截面格构柱支撑航站楼整个屋盖结构，其抗震性能需要模型试验验证。C1区屋盖结构平面形状近似呈直角三角形，东西宽248 m，南北长210 m，北侧网架悬挑47 m，是航站楼屋盖钢结构最大的结构单元。综合考虑试验场地大小、模型制作加工难易程度、加载设备能力大小等因素，采用1∶10的比例制作了缩尺模型，进行静力和拟静力试验，研究C形柱体系与上部屋盖结构组成的整体结构的静力和抗震性能。研究结果表明：在竖向荷载下结构响应的试验值与理论值吻合较好，C形柱结构的破坏形式为局部杆件的屈曲和断裂，局部破坏发生后C形柱结构的承载能力没有显著下降，变形没有显著增大，整体稳定性能良好；C1区整体结构的耗能能力比较稳定，进入弹塑性工作阶段后结构刚度衰减较快；C1区整体结构的破坏模式为广义的梁端出现塑性铰，满足"强柱弱梁"的结构设计要求；C1区整体结构可以承受超过9度的罕遇地震作用，结构具有很高的安全储备，抗震性能良好。
The roof structure of Beijing Daxing International Airport Terminal Building is a long-span steel structure. It is an over-limit high-rise building structure with a maximum structural length of 504 m and a maximum span of 125 m. Static and pseudo-static tests were carried out to study the static and seismic performance by making a 1:10 scale model of overall structure of C1 area of the roof steel structure of Beijing Daxing International Airport Terminal Building. The space static loading test was conducted on 9 full-size complex tubular joints to examine the effect of stiffening ribs, steel grades, and loading modes. The results indicate that the experimental values of the structural response under vertical load is consistent with the theoretical values. Local members buckle and fracture are the failure modes of the C-shaped column structure. After the failure occurs, the bearing capacity of the C-shaped column structure does not decrease significantly and the deformation does not increase significantly. It indicates that C-shaped column structure has a good overall stability. The energy dissipation capacity of the C1 overall structure is relatively stable, and the stiffness degradation of the structure is significant when it enters the elastic-plastic state. The failure mode of the C1 overall structure is that plastic hinges appear at the end of the generalized beam, which meets the structural design concept of "strong columns and weak beams". The C1 overall structure can withstand the impact of rare earthquake of magnitude exceeding 9 degrees. The structure has a high safety reserve and good seismic performance.