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

21世纪连续预应力组合桥梁的创新系统

• 批准号: 9705235
• 负责人: Nabil Grace
• 金额: --
• 依托单位: Lawrence Technological University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-01 至 2002-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9705235&HistoricalAwards=false
• 关键词: Innovative; System; Continuous; Prestressed; Composite

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.

这项研究提出了一种新的概念，涉及开发多跨连续预应力混凝土桥梁系统，该系统不需要支撑或模板，并且与传统的连续桥梁系统相比具有优越的特性。防腐蚀桥梁系统将由以下材料建造：(i) 改进的预制预张法，内部碳纤维增强塑料 (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 剪力连接器连接到 DT，以及 (iii) 外部 覆盖连续 CFRP 后张拉线。大三和大四本科生将进行分析和实验研究，以检验多跨连续预应力新型桥梁系统的静态、动态、疲劳和极限荷载特性。这些包括开裂、弯曲强度、冲剪强度、阻尼响应、固有频率和相关模态以及疲劳强度。多跨连续预应力桥梁体系及其施工技术实现了防腐高效桥梁新方法的飞跃和突破。它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。密歇根州胭脂河上的三跨简支桥正在进行的实施和设计证明了这一创新桥梁系统的成功和本科生研究工作的质量。