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为了给大节段钢箱梁的制造及整孔吊装施工控制提供技术依据,针对整体温度变化对等跨径等截面连续钢箱梁制作及架设过程中线形变化的问题,以港珠澳大桥工程中深水区非通航孔桥6×110m一联的标准联连续钢箱梁桥工程为研究背景,选取海中等宽段桥梁的大节段钢箱梁进行研究。采用大型专用有限元程序MIDAS/Civil建立了深水区非通航孔桥大节段钢箱梁的空间梁单元数值模型,忽略沿钢箱梁横向温差带来的影响,依据桥位区常年温度跟踪观测的成果,在2.7℃~42.7℃范围内以5℃为间隔,研究了整体温度影响下,大节段钢箱梁安装时钢箱梁支座中心处的整体位移、相对位移以及其总位移的计算方法及影响程度;分析了由于钢箱梁加工制作季节差异,导致钢箱梁在胎架上组装时,考虑定位时刻的温度与设计温度的整体偏差对胎架线形的影响规律,及钢箱梁小里程侧的相对里程、相对拱度的修正方法。研究结果表明:大节段钢箱梁整孔吊装施工时,落梁前各墩顶支座的整体位移与温度呈线性变化;落梁后的支座相对位移值受温度影响极小,可以忽略不计;不同温度下的相对里程与相对高程的修正值与温度成正比;研究成果成功地指导了港珠澳大桥钢箱梁制作、吊装施工。
In order to provide technical basis for the manufacture of large sections of steel box girder and control of hoisting construction of whole hole, aiming at the problem of linear change in the production and erection of continuous steel box girder with equivalent cross-section of equal span, such as overall temperature change, As a research background, a 6 × 110m unconnected standard steel box girder bridge with non-viable access bridge in medium-deep water area was selected as the research object. A large-scale special finite element program MIDAS / Civil was used to establish the spatial beam element numerical model of large-section steel box girder with non-navigable bridge in deep water area. Ignoring the influence of lateral temperature difference along the steel box girder, The overall displacement, relative displacement and total displacement at the center of the steel box girder support during the installation of the large section steel box girder are studied under the influence of the overall temperature under the temperature range of 2.7 ℃ ~ 42.7 ℃ at 5 ℃. The calculation method and the degree of influence are analyzed. The influence of the overall deviation of the temperature and the design temperature at the time of positioning on the tire shape is analyzed when the steel box girder is assembled on the tire frame due to the seasonal difference of the steel box girder, Liang small mileage side of the relative mileage, relative camber correction method. The results show that when the whole section of large-section steel box girder is hoisted and installed, the overall displacement of the top abutment before the falling beam changes linearly with the temperature. The relative displacement of the abutment after falling off the beam is minimally affected by temperature and can be neglected Regardless of temperature; relative temperature at different temperatures and the relative elevation of the correction value is proportional to the temperature; research results successfully guided the Hong Kong-Zhuhai-Macao Bridge steel box girder production, lifting construction.