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大跨径预应力混凝土箱梁桥因其良好的受力性能与优美的外观在各国的桥梁建设中得到了广泛应用,但普遍存在的下挠问题已制约了此类桥型的发展。针对下挠现象与柬埔寨的高温高湿环境,选取Prek Kdam洞里萨河大桥作为研究对象,构建下挠问题理论模型,分析不同因素对下挠的影响度,进而得出下挠的显著影响因子。在此基础上,通过在施工中设置预拱度的方法控制成桥后的不利下挠,以期保障桥梁安全运营,增加社会经济效益,同时为今后柬埔寨的援建工程提供参考。
Due to its good mechanical performance and beautiful appearance, the long-span prestressed concrete box girder bridge has been widely used in the bridge construction in many countries. However, the widespread torsional deflection has restricted the development of such bridges. According to the phenomenon of deflection and the high temperature and high humidity environment in Cambodia, Prekdamdam Bridge is chosen as the research object, the theoretical model of the torsional deflection problem is established, the influence degree of different factors on the deflection is analyzed, and the significant influence factor . On this basis, the pre-caving method is adopted to control the unfavorable deflection after the bridge construction in order to ensure the safe operation of the bridge and increase the social and economic benefits. At the same time, it provides a reference for the reconstruction of Cambodia in the future.