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跨层平面桁架结构体系在大跨度钢结构中得到广泛应用,其稳定问题是结构设计的关键。以大庆西站房跨层平面桁架结构为背景,采用缩尺试验和数值分析相结合的方法,系统分析该跨层平面桁架结构的整体稳定性能。研究结果表明:该跨层平面桁架结构失稳形式主要为面外弯曲失稳,面外变形较小;桁架节点处由于杆件交汇数量多,局部应力复杂,发生明显的强度破坏,建议实际工程中应对受力较大的节点进行加强处理。
Cross-deck planar truss structure system is widely used in long-span steel structures, and its stability is the key to structural design. Based on the cross-deck truss structure of Daqing West Railway Station, the overall stability of the cross-deck truss structure is systematically analyzed by the combination of scale test and numerical analysis. The results show that the main instability of the cross-deck truss structure is out-of-plane bending instability and the out-of-plane deformation is small. Due to the large number of rod intersections and the complicated local stress, the strength failure occurs obviously at the truss nodes. In response to the larger nodes to strengthen treatment.