面向未来的高性能桥梁结构研发与应用
Research and Application of High Performance Bridge Structures Toward Future

为从根本上解决混凝土桥、钢桥及钢？不炷？土组合桥中的共性技术难题，并提升桥梁结构的性能与品质，笔者团队以超高性能混凝土（UHPC）为基础，研发了面向未来的高性能桥梁结构体系。介绍了笔者团队研发的4类高性能桥梁结构：①钢-超高韧性混凝土（STC）轻型组合桥面结构，其中的STC是钢桥面专用的UHPC；②钢？？UHPC华夫板轻型组合桥梁结构；③单向预应力UHPC薄壁连续箱梁结构；④全预制快速架设UHPC城市桥梁结构。通过大量静力和疲劳试验，掌握了各类UHPC桥梁结构的基本受力性能，并建立了计算理论和设计方法。列举了钢？？STC轻型组合桥面结构已推广应用于中国的17座钢桥，涵盖了梁桥、拱桥、斜拉桥和悬索桥等各类基本桥型，典型应用包括湖南岳阳洞庭湖二桥等重大工程。到目前为止，各实桥运营状态良好，钢？？STC未出现任何病害问题。综合而言，高性能桥梁结构有望突破现有桥梁中的技术瓶颈，具有广阔的应用前景。
In order to overcome the common technical problems of concrete bridges, steel bridges, and steel？？concrete composite bridges, and to improve the performance and quality of bridge structures, the research group at Hunan University developed the high performance bridge structure system based on ultra-high performance concrete (UHPC) technology. Four types of high performance bridge structures were developed: ①steel-STC lightweight composite deck, in which STC denoted a kind of UHPC specially developed for orthotropic steel decks; ②steel-UHPC waffle deck lightweight composite girder; ③thin-wall UHPC continuous girder bridge with only longitudinal prestress; ④fully prefabricated UHPC city bridges facilitating rapid erection.Based on a great number of static and fatigue tests, the research group revealed the basic mechanical performance of the high performance bridge structures, and developed calculation theory and design method for them. The steel-STC lightweight composite deck was applied to 17 real bridges in China, and the application covered the four basic bridge types, i.e., girder bridge, arch bridge, cable？？stayed bridge, and suspension bridge. A typical pilot project is the 2nd Dongting Lake Bridge in Yueyang, Hunan. All of these bridges are in good service states, without any damage developed in STC. To sum up, since the high performance bridge structures have the potential of overcoming technical bottlenecks in conventional bridges, they should have a promising future