长跨变坡连续钢箱梁顶推受力特性分析

依托荆山河特大桥工程，针对钢梁顶推施工中的结构受力及变形展开研究。应用数值模拟的手段，模拟顶推施工过程，分析该过程中各个节段模型的受力状态，重点分析钢箱梁在垫块、横向偏移、局部支撑等多参数影响下的局部受力性能，建立多尺度三维有限元模型，参数化分析钢箱梁结构的力学状态以及稳定性能，确定合理参数范围，明确横向纠偏阈值，控制纠偏频率，确保结构在成桥前后的安全可靠。

Analysis on Incremental Launching Stress Characteristics of Long-span Variable-slope Continuous Steel Box Girder

Relying on the project of Jingshan River Bridge, the structural stress and deformation in the incremental launching construction of steel girder are studied. The incremental launching construction process is simulated by means of numerical simulation, and the stress state of each segment model in the process is analyzed. The local stress performance of the steel box girder is specially analyzed under the influence of multi parameters such as cushion block, lateral offset, local support and so on. A multi-scale three-dimensional finite element model is established. The mechanical state and stability of the steel box girder structure are parametrically analyzed. The reasonable parameter range is determined. The lateral correction threshold is clarified. The deviation correction frequency is controlled. The safety and reliability of the structure before and after the completion of the bridge are ensured.