为研究斜吊杆异型系杆拱桥的空间力学特性,以某异型系杆拱桥为研究对象,采用MIDAS Civil建立该桥空间有限元模型,分析其在施工和使用阶段的静、动力特性及结构稳定性.分析结果表明:该桥斜吊杆附加应力对拱肋影响较大,全桥纵、横梁框架体系整体刚度较大,拱肋挠度对整体降温比较敏感,使用阶段各吊杆应力幅比较均匀,为50 MPa左右；拱肋侧倾刚度较小,拱肋刚度对全桥刚度贡献较大,各阶段稳定系数均较高；吊杆调索对全桥应力水平有较大影响,施工中应予注意.%To study the spatial mechanical properties of irregular-shape tied arch bridges with inclined hangers, a tied arch bridge of the same type was taken as the research object, the MIDAS Civil was used to set up the spatial finite element model for the bridge, the static, dynamic prop-erties and structural stability of the bridge at construction and service stages were analyzed. The results of the analysis indicate that the impact of additional stress of the inclined hangers on the arch ribs is great. The global rigidity of the stringer and cross beam frame system of the whole bridge is considerable. The deflection of the arch ribs is sensitive to temperature fall. The stress amplitude of the hangers at service stage is uniform and is about 50 Mpa. The lateral inclination rigidity of the arch ribs is little, the contribution of the rigidity of the arch ribs to the rigidity of the whole bridge is great and the stability factors of various stages are high. The adjustment of the hanger cables has considerable impact on the stress levels of the whole bridge, to which atten-tion should be paid in the process of construction.
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