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

这项研究提出了一种新的概念，涉及多跨连续预应力混凝土桥梁体系的发展，这种体系无需支撑或模板，与传统的连续桥梁体系相比具有更好的特点。无腐蚀桥梁系统将包括：(I)改进的预制先张法，内部采用碳纤维增强塑料(CFRP)绞线，双T(DT)梁，(Ii)现浇连续桥面，用玻璃纤维增强塑料(GFRP或CFRP)钢筋，通过CFRP或GFRP剪切连接件连接到DT，以及(Iii)外部覆盖的连续CFRP后张法绞线。针对多跨连续预应力新桥体系的静力、动力、疲劳和极限荷载特性，将由初三和高年级的学生进行分析和试验研究。这些指标包括开裂、弯曲强度、冲切强度、阻尼响应、固有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无腐蚀高效桥梁发展新途径的一次飞跃和突破。这将大大节省施工时间和成本，并彻底消除美国未来桥梁的腐蚀问题。密歇根州鲁日河上正在进行的三跨简支桥的实施和设计证明了这一创新桥梁体系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.