大跨径连续梁不对称悬臂施工若干问题探讨

Discussion on Several Issues in Unbalanced Cantilever Construction of Long-span Continuous Beam

预应力钢筋混凝土连续梁桥具有跨越能力大、行车平稳、养护简便等优点,在近代桥梁建筑中得到越来越多的应用,而悬臂施工法是目前建造预应力钢筋混凝土连续梁桥的主流施工方法。本文以实际工程为基础,采用数值仿真分析法,对大跨径预应力钢筋混凝土连续梁桥不对称悬臂施工过程中结构的力学特点及相关问题进行分析和探讨,并对临时压重、临时锚固拆除时机、环境温差对应力及挠度的影响进行归纳总结,以期为今后同类桥梁设计、施工及相关研究提供参考。

Prestressed reinforced concrete continuous beam bridge has been used widely in modern bridge buildings because of its advantages of large span capacity,stable driving and simple maintenance.The cantilever construction method is currently the mainstream construction method for building prestressed reinforced concrete continuous girder bridges.Based on practical engineering,this paper used numerical method to analyze and discuss the mechanical characteristics and related problems of large-span prestressed reinforced concrete continuous girder bridge during asymmetric cantilever construction process.Moreover,the impact of temporary weight,temporary anchorage demolition timing and environmental temperature difference on structure stress and deflection were analyzed and summarized,which could provide reference for the design,construction and research of similar bridges in the future.