考虑复杂边界和荷载下拱效应的组合梁桥面板理论模型与设计方法

钢-混凝土组合梁受力性能优越，在国内外桥梁工程中应用广泛，实现高性能的组合梁桥面板设计对促进组合梁桥高质量发展有重要意义。拱效应显著提高组合梁桥面板承载力和刚度，在设计中合理地予以考虑可带来显著的技术经济效益。但因组合梁桥面板边界约束状态不够明确，且缺乏考虑复杂边界和荷载条件影响的拱效应理论分析方法，严重制约了拱效应的应用。本项目首先通过试验研究揭示组合梁桥面板在体系中的边界约束状态与复杂边界和荷载条件下拱效应产生与发展机理。随后结合理论研究与有限元分析，提出组合梁桥面板边界数值模拟与理论计算方法，并建立考虑复杂边界和荷载条件下拱效应的桥面板理论模型，极大地拓展拱效应理论的适用范围。最后集成边界与拱效应研究成果，提出组合梁桥面板基于正常使用和承载力极限状态的考虑拱效应的设计方法，为拱效应在组合梁桥面板设计中的广泛应用奠定坚实的理论基础。

Steel-concrete composite girders are widely used in bridges at home and abroad due to their superior mechanical performances. The realization of high-performance design of deck slabs in composite girders is of great significance to promote the high-quality development of composite girder bridges. Arching action effect can significantly improve the load capacity and stiffness of deck slabs in composite girders, thus it can bring significant technical and economic benefits when being reasonably considered in the design. However, the application of arching action effect is seriously restricted because the boundary conditions of deck slabs in composite girders remain unclear, and the theoretical method to consider the arching action effect under complex boundary and loading conditions is still lacking. This project will first reveal the boundary conditions of the deck slabs in the composite girder structural systems, as well as the generation and development mechanisms of arching action effect under complex boundary and loading conditions through the experimental study. Then, combining with the theoretical research and finite element analysis, the numerical simulation and calculation methods for boundary conditions of deck slabs in composite girders are proposed. Subsequently, the theoretical model for the deck slab considering the arching action effect under complex boundary and load conditions is established, which will greatly expand the application scope of the arching action theoretical model. Finally, by integrating the studies on the boundary conditions and arching action effect, the design approaches for deck slabs in composite girders considering arching action effect at both serviceability and ultimate limit states are proposed. The proposed methods can lay a solid theoretical foundation for the wide application of arching action effect in the design of deck slabs in composite girder bridges.