Innovative System of Continuous Prestressed Composite Bridges for the 21st Century

本研究提出了一种新型的多跨连续预应力混凝土桥梁体系，该体系与传统的连续桥梁体系相比，不需要支撑和形式，具有优越的特点。无腐蚀性桥梁系统将由：(i)内部碳纤维增强塑料（CFRP）钢绞线，双t型（DT）大梁，（ii）现浇连续桥面，用玻璃碳纤维增强塑料（GFRP或CFRP）钢筋加固，通过CFRP或GFRP剪切连接件连接到DT，以及（iii）外部覆盖连续CFRP后张力钢绞线。本专业大三、大四学生将对多跨连续预应力新桥体系进行静力、动力、疲劳和极限荷载特性的分析和试验研究。这些参数包括开裂、弯曲强度、冲孔剪切强度、阻尼响应、固有频率和相关模态振型以及疲劳强度。多跨连续预应力桥梁体系及其施工技术是无腐蚀高效桥梁发展新途径的飞跃和突破。这将大大节省施工时间和成本，并完全消除未来美国桥梁的腐蚀问题。密歇根州Rouge河上正在进行的三跨简支桥的实施和设计证明了这种创新桥梁系统的成功和本科生研究工作的质量。

This research presents a new concept dealing with the development of a multi-span continuously prestressed concrete bridge system that requires no shoring or forms and has superior characteristics compared to conventional continuous bridge systems. The non-corrosive bridge system will be built of: (i) modified precast pretensioned, with internal carbon fiber reinforced plastic (CFRP) strands, Double-T (DT) girders, (ii) cast-in-place continuous deck, reinforced with glass carbon fiber reinforced plastic (GFRP or CFRP) rebars, connected to the DT through CFRP or GFRP shear connectors, and (iii) externally draped continuous CFRP post-tension strands. An analytical and experimental study will be conducted by Junior and Senior undergraduate students to examine the static, dynamic, fatigue and ultimate load characteristics of the multi-span continuously prestressed new bridge system. These include cracking, flexural strength, punching shear strength, damping response, natural frequencies and associated mode shapes and fatigue strength. The multi-span continuously prestressed bridge system and its construction technique present a leap forward as well as a breakthrough in the development of a new approach for non-corrosive efficient bridges. It will result in considerable savings in construction time and costs and in the complete elimination of corrosion problems in future USA bridges. The ongoing implementation and design of the three-span simply-supported bridge over the Rouge River in the state of Michigan is a testimony to the success of this innovative bridge system and the quality of the research work of undergraduate students.