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为提高城市高架桥对未来交通量的适应性以及为实现山区大跨桥梁上部结构的轻型化,顶板悬臂下设斜撑的预应力混凝土箱梁应运而生。通过文献调研和实桥调查,简要介绍了这种新型箱梁结构的设计理念与构造特征,阐明了国外对这种箱梁结构的力学特性的研究现状及其在欧美、日本等国家的应用情况,指出了今后中国在这种箱梁结构研究方面的主要方向。研究结果表明:与传统的预应力混凝土箱梁相比,顶板下设斜撑的预应力混凝土箱梁具有显著的结构优势和良好的经济性能,国外在这种箱梁的施工阶段分析、抗弯计算、剪切与扭转计算、横向内力计算等方面的设计计算理论已取得了很多成果,特别是日本在实桥工程应用方面积累了较为成熟的经验,而中国在这方面的研究还几乎是空白。这种箱梁桥在中国中西部地区有着广阔的发展前景和巨大的市场潜力,应尽早加强有关设计方法和施工技术的研究,以实现其在工程实践中的应用。
In order to improve the adaptability of urban viaducts to future traffic volume and to realize the light weight of the superstructure of long-span bridges in mountain areas, prestressed concrete box girders with diagonal bracing under the roof cantilevers are emerging. Through literature investigation and real bridge survey, the design concept and structural features of this new box girder structure are briefly introduced, and the current research status of the mechanical properties of this box girder structure and its application in Europe, the United States, Japan and other countries are expounded , Pointed out the future China in the box beam structure of the main directions. The results show that compared with the traditional prestressed concrete box girder, the prestressed concrete box girder with diagonal bracing under the roof has significant structural advantages and good economic performance. During the construction period of this box girder overseas, the bending resistance There have been many achievements in the design calculation theory of calculation, shear and torsion calculation, lateral internal force calculation, etc. In particular, Japan has accumulated more mature experience in the application of real bridge engineering. However, the research on this subject in China is almost empty . The box girder bridge in the central and western regions of China has broad prospects for development and huge market potential, as soon as possible to strengthen the design methods and construction technology to achieve its application in engineering practice.