港珠澳大桥沉管隧道的横截面承载力分析

以港珠澳大桥沉管隧道最大埋深段为研究对象,将沉管隧道简化为框架结构,采用荷载结构模型对结构内力进行分析,研究各构件的内力状态.在内力分析的基础上,进一步验算沉管隧道各构件的正截面承载力、斜截面抗剪承载力及结构表面混凝土裂缝宽度.计算结果表明:沉管隧道正常使用状态下的极限承载力由混凝土裂缝宽度控制,正截面承载力和斜截面抗剪承载力都远大于结构的内力;使用有限元软件Abaqus对沉管隧道模拟的结果与理论计算的内力状态、混凝土受拉破坏状态相吻合.

Cross-Section Bearing Capacity Analysis of Immersed Tunnel of Hong Kong-Zhuhai-Macao Bridge

Taking immersed tunnel of Hong Kong-Zhuhai-Macao Bridge in the maximum buried depth as the research object, the immersed tunnel is simplified as a frame structure. The load-structure model is used to analyze the internal force of the structure, and the internal force state of each component is studied. On the basis of internal force analysis, the bearing capacity of normal section, shear capacity of inclined section and crack width of concrete on the surface of immersed tunnel members are checked. The calculation results show that the ultimate bearing capacity under normal service loading is controlled by the crack width of concrete, and the normal section bearing capacity and the inclined section shear bearing capacity are far greater than the internal force of the structure. The simulation results of the immersed tunnel by finite element software Abaqus are consistent with the theoretical calculation of the internal force state and the concrete tensile failure state.