一种新型跨海大桥非通航孔桥型及其应用前景初探
Preliminary Study on a New Bridge Type for Non-Navigable Spans of the Cross-Sea Bridge and Its Application Prospects
摘要: 为适应国内跨海大桥建设的需要，结合超高性能纤维增强混凝土(Ultra-High Performance Fiber Reinforced Concrete，简称UHPFRC)，本文提出了一种适用于跨海大桥非通航孔的新型组合箱梁结构形式，由UHPFRC腹板和底板、高强混凝土顶板组成。和常规混凝土箱梁相比，该组合箱梁具有自重轻、跨度大、混凝土开裂风险低、徐变效应小、耐久性能好等优点。以一座4 × 100 m组合箱梁桥为例进行了结构设计和仿真分析，获得了结构应力和变形状态，并对UHPFRC材料的设计应力取值大小和耐久性进行了调研和分析，以此进行讨论。结果表明：主梁各项应力值均满足UHPFRC材料应力限值，结构刚度与耐久性满足要求，完全具有施工可行性；与常规PC箱梁桥、组合钢箱梁相比，该新桥型具有良好的经济性能指标。因此，本文提出的新型组合箱梁在受力、经济、耐久性等方面具有极大的竞争优势，可很好地适用于跨海大桥非通航孔区域，有着极为广阔的推广应用前景。
Abstract: Aiming to adapt the demand of cross-sea bridge construction in China, a new composite box girder for non-navigable spans of the cross-sea bridge was proposed combining Ultra-High Performance Fiber Reinforced Concrete (UHPFRC), which consists of the web and the base plate with the UHPFRC and the top plate with the high-strength concrete. Compared with conventional concrete box girder, this new composite box girder possesses a lot of merits, including light weight, large span, low cracking risk, low creep, good lasting quality and so on. Structural design and analytical analysis for the new composite box girder with span length of 4 × 100 m were presented, structure stress and deformation state of the computational model were acquired. In addition, stress value for design and durability of UHPFRC were investigated. Discussion was given and the results showed that stress value of the girder all meet the material stress limit. Also, the structural stiffness, durability, and construction feasibility all meet the demand. Then, compared with conventional prestressed concrete box girder and steel-concrete composite box girder in economic indicator, the results showed that a good economy may be achieved by using this new type. Above all, the new composite box girder proposed in this paper is a competitive bridge type in mechanical properties, economy, durability and other aspects, which could apply to non-navigable spans of the cross-sea bridge well and demonstrates a good prospect of application and extension.
文章引用：周之栋, 周聪. 一种新型跨海大桥非通航孔桥型及其应用前景初探[J]. 土木工程, 2026, 15(6): 195-208. https://doi.org/10.12677/hjce.2026.156170

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