大跨径闭口钢箱组合梁桥研究进展和技术特点

Research Progress and Technical Feature of Long-span Closed Steel Box Composite Girder Bridge

摘要:

简要介绍了大跨径闭口钢箱组合梁桥的发展情况。闭口钢箱组合梁兼具钢箱梁和槽型组合梁的优点，特别适用于曲线半径较小、跨度较大及扭转性能要求较高的桥梁，具有施工方便、结构性能好、经济性能较佳等优点，在城市、山区等复杂环境中具有很强的竞争力，获得了快速发展和应用，因此亟需开展相关理论研究和试验论证工作。为此，对闭口钢箱组合梁桥在设计方法、结构形式等方面的技术特点进行了归纳总结，并分析阐述了其在设计方法、结构体系、组合桥面板和负弯矩区开裂等领域值得进一步研究的关键技术问题。

Abstract:

The development of long-span closed steel box composite girder bridge is briefly introduced. The closed steel box composite girder has the advantages of steel box girder and channel-shaped composite girder, which is especially suitable for bridges with small curve radius, long span or high demand for torsional property of the bridge. The bridge has the advantages such as convenient construction, good structural properties, and fine economical properties, and has the strong competitiveness in the complex environmental of cities and mountainous areas. The rapid development and applications are achieved. Therefore, it is desiderated to carry out the relevant theoretical research and experimental demonstration. The technical characteristics of the closed steel box girder bridge are summarized from the design methods and structural types. And the key technical problems worthy of further research in the field of design method, structural system, composite deck slab and cracking in negative bending moment zone are analyzed and expounded.