Research Initiation Award: High-Performance Green Bridges

研究启动奖--高性能绿色桥梁--的目标是为高性能绿色桥梁的设计和建造制定一个评级系统，特别强调使用复合材料作为内部加固的新一代抗震桥梁柱的开发。研究目标是：通过建立评级体系来定义高性能绿色桥梁的标准，以制定新桥梁的可持续设计和施工认证级别；设计由纤维增强聚合物(FRP)筋作为内部配筋和能量装置的结构允许的抗震桥柱，以帮助将残余位移降至最低；通过试验测试和分析模型验证，证明可以用FRP筋和能量装置精心设计和设计新型桥柱的结构性能，以抵御中强地震地面运动。教育目标是：在摩根州立大学建立一个现代化的绿色交通基础设施中心；在高级结构分析和设计主题领域吸引、招聘、培训和指导本科生；并在学术出版物和会议论文中传播结果。该项目的成果将导致开发下一代可持续的高性能桥梁，其可选方案包括抗震桥柱及其连接，其中包括外部无粘结的FRP筋以帮助地震时自我定心，内部粘结的FRP筋提供足够的变形能力，以及能量装置来吸收地震能量。体外无粘结FRP筋在地震中应保持弹性，以实现“受控摇摆”，这适用于应变在1-3%范围内表现出高抗拉强度和非延性行为的FRP筋。

The Research Initiation Award entitled - High-Performance Green Bridges - has the goal to formulate a rating system for the design and construction of high-performance green bridges with particular emphasis on the development of a new generation of seismic-resistant bridge columns using composite materials as internal reinforcement. The research objectives are: to define the criteria for a high-performance green bridge through the creation of a rating system to develop sustainable design and construction certification levels of new bridges; to design a structurally admissible and seismically resistant bridge column comprised of fiber reinforced polymer (FRP) bars as the internal reinforcement and energy devices to help minimize residual displacements; and to prove through experimental testing and analytical modeling validation that the structural behavior of a new class of bridge columns can be carefully engineered and designed with FRP bars and energy devices to resist moderate-to-strong earthquake ground motions. The education objectives are: to establish a modern Green Transportation Infrastructure Center at Morgan State University; to attract, recruit, train, and mentor undergraduate students in areas of advanced structural analysis and design topics; and to disseminate the results in scholarly publications and conference papers.The results of the project will lead to the development of the next generation of sustainable, high-performance bridges with options for the implementation of seismically-resistant bridge columns and their connections that consist of externally unbonded FRP bars to aid with self-centering during an earthquake, internally bonded FRP bars to provide sufficient deformability, and energy devices to absorb energy from the earthquake. The externally unbonded FRP bars are expected to remain elastic during an earthquake for "controlled rocking," which is appropriate for FRP bars that exhibit high tensile strength and non-ductile behavior with strains in the range of 1-3%.