【摘要】 以某大跨度钢筋混凝土-钢混合结构为研究对象，建立了整体结构和局部关键节点的非线性有限元模型，对比分析了水平双向地震以及水平与竖向地震联合作用下结构的地震响应规律。分析结果表明，结构整体响应指标均符合设计规范要求；竖向地震作用对结构楼层的竖向位移有较大影响，且对大跨桁架的上下弦杆和腹杆的内力影响最显著。桁架下弦杆与柱连接节点存在应力集中，设计时应验算承载能力和罕遇地震下最大应力，以满足抗震性能化设计目标。更多还原

【Abstract】 For a large-span reinforced concrete-steel hybrid structure, a nonlinear finite element model was established to explore the seismic response of the structure under horizontal bidirectional seismic and horizontal-vertical seismic combined excitations. The results show that the overall response index of the structure meets the design specifications. The vertical seismic action will cause a significant impact on the vertical displacement of the top floor and the internal forces of the top and bottom chords and diagonal bracings of the large-span truss; The joint between the bottom chords and columns of the truss exhibits significant stress concentration, thus their load-bearing capacity and maximum stress under rare earthquake should been checked to meet the objectives of seismic design codes.更多还原