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为研究港珠澳工程青州航道斜拉桥的力学性能,分别采用空间梁单元模型和板壳精细化模型对施工阶段、成桥状态和运营阶段进行了仿真模拟分析,研究了施工、成桥和运营状态下青州航道桥的空间受力行为,分析了悬拼阶段及成桥状态下箱梁的横向变形,并对比分析了2种模型的计算结果。研究结果表明:考虑几何非线性的梁单元模型可分析宽幅钢箱梁斜拉桥的主要纵向受力行为,但不能准确反映桥塔及结构的横向受力状态;钢箱梁悬拼过程中横向变形以弯曲变形为主,翘曲等影响较小,桥面吊机前支点反力是引起梁段横向错缝过大的主要因素;成桥后主梁在自重与索力作用下的横向变形并不均匀,无索区箱梁边腹板处相对于桥面中心线下挠,而索区相对于桥面中心线处上挠,横截面的翘曲现象明显。
In order to study the mechanical properties of the Qingzhu Channel cable-stayed bridge of Hong Kong-Zhuhai-Macao Project, the spatial beam element model and the plate shell refinement model were respectively used to simulate and analyze the construction phase, the bridge completion phase and the operation phase. Under the condition of operation, the space stress behavior of Qingzhou channel bridge is analyzed. The transverse deformation of the box girder in suspended suspension phase and completed bridge state is analyzed. The results of two models are compared and analyzed. The results show that the beam element model considering geometrical nonlinearity can analyze the main longitudinal force behavior of cable-stayed bridge with wide steel box girder, but can not accurately reflect the lateral force state of bridge tower and structure. The main deformation and deformation of the girder of the bridge crane are the main factors that cause the transverse joint of the girder section to be too large. The deformation is not uniform, and the girder of the box girder in the no-load zone is downwardly flexed relative to the centerline of the bridge deck. The warp of the cable zone is opposite to the centerline of the bridge deck, and the warpage of the cross-section is obvious.