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

本研究提出了一个新的概念，处理多跨连续预应力混凝土桥梁系统的发展，不需要支撑或形式，并具有上级的特点相比，传统的连续桥梁系统。无腐蚀桥梁系统将由以下部分构成：（i）改良预制预张拉，内部为碳纤维增强塑料（CFRP）绞线，双T（DT）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剪力连接件连接至DT;以及（iii）外部悬挂连续CFRP后张绞线。本研究将由大三与大四学生进行分析与实验研究，以探讨多跨连续预应力新桥系统之静态、动态、疲劳与极限荷载特性。这些包括开裂、弯曲强度、冲切强度、阻尼响应、自然频率和相关振型以及疲劳强度。多跨连续预应力桥梁体系及其施工技术是一次飞跃，也是无腐蚀高效桥梁新途径的突破。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。目前正在实施和设计的三跨简支桥在密歇根州的胭脂河是一个证明了这种创新的桥梁系统的成功和本科生的研究工作的质量。

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.