NEESR-SG; Seismic Performance of Bridge Systems with Conventional and Innovative Materials

智力优势：拟议研究的主要技术目标是对一系列四跨大型桥梁系统模型的抗震性能进行全面调查，包括基脚和桥台处的土-结构相互作用效应。 一个强大的跨学科研究团队的形成，导致在桥梁模型，土壤-结构相互作用，数值模拟，创新材料和无线传感器的振动台响应的研究工作，在教育和推广和利用信息技术的总体努力。 两名国际知名合作者及设计界代表亦会参与。 通过使用NEESgrid系统及其工具，团队成员和他们的学生将在他的多方面研究中密切合作。 广泛的数值和物理模拟研究的设想，前者使用程序OpenSees和后者使用NEES振动台设施在大学的加州，圣地亚哥（UCSD）和大学的内华达州，里诺（UNR）。 一个大型桥台将在UCSD进行测试，四个大型4跨桥梁模型将在UNR进行测试。 UCSD研究将提供用于模拟UNR试验中桥台输入运动的数据。 其中两座桥梁模型将采用传统设计，第三座将由纤维增强聚合物（FRP）复合材料桥墩支撑，第四座将采用创新的柱塑性铰，永久性损伤最小。 拟议研究将解决的主要差距是桥梁系统地震性能的实验数据和校准分析研究。 与过去的研究一般是在组件，拟议的研究将包括系统响应，除了组件的行为。 现代无线传感器将作为该项目的一部分进一步开发，并用于振动台研究。 该研究的结果预计将有助于评估现有和新兴的桥梁抗震规范，为基于性能的抗震设计提供信息，帮助了解系统响应，确定FRP桥墩的有效性，评估无线传感器在大规模测试中的潜力，并证明强震后创新的可使用桥梁柱的可行性。 设想采用新的数据和元数据模式，以便利将项目中获得的新信息纳入NEES联合会计划建立的数据储存库。 更广泛的影响：拟议项目的更广泛的影响将包括其强大的教育推力和整体社会影响。 通过本项目以多种形式产生的新知识，本研究将（1）使用地震工程研究和信息技术的最新技术直接培训多所大学的博士后研究员、研究生和本科生，（2）教育K-12学生、教师和公众了解桥梁地震工程，（3）将教学和研究结合在入门和高级大学课程中，（4）为高中开发教学模块，（5）开发互动网站，（6）提高对地震工程师社会作用的基本理解，（7）激励K-12学生增加所有有才华的学生，妇女，少数民族，和其他人认真考虑地震工程作为一个专业。 拟议项目的总体社会影响将是：（a）用最先进的NEES设备培训熟练的地震工程师，以改善人力资源库，（B）提高公众对地震工程在社会中的关键作用的理解和认识，（c）根据来自美国几所大学和两所海外大学的强大的多学科研究人员团队进行的研究，（d）推动在设计规范中可靠地实施基于性能的新桥梁设计和现有桥梁的改造，以确保桥梁安全并减少未来强震中的经济损失，（f）通过本项目与国际合作者的互动和国际交流机会，增进全球了解，以及（g）为几个潜在的有效载荷项目提供机会，这些项目可以进一步促进一批高素质教师的发展，其中一些人是过去NSF职业或其他奖项的获得者。

Intellectual Merit: The primary technical objective of the proposed study is to conduct a comprehensive investigation of the seismic performance of a series of models of four-span large-scale bridge systems including the soil-structure interaction effects at the footings and the abutments. A strong interdisciplinary team of researchers is formed to lead the effort in the study of the shake table response of bridge models, soil-structure interaction, numerical simulation, innovative materials, and wireless sensors with an overarching effort in education and outreach and utilization of information technology. Two leading international collaborators and representatives from the design profession will be also involved. Through the use of NEESgrid system and its tools, the team members and their students will closely collaborate in his multi-faceted study. Extensive numerical and physical simulation studies are envisioned, with the former using program OpenSees and the latter using the NEES shake table facilities at the University of California, San Diego (UCSD) and the University of Nevada, Reno(UNR). A large-scale abutment will be tested at UCSD and four, large-scale, 4-span bridge models will be tested at UNR. The UCSD studies will provide data that will be used in simulating the abutment input motion in the UNR tests. Two of the bridge models will incorporate conventional design, the third will be supported on fiber-reinforced polymer (FRP) composite piers, and the fourth will incorporate innovative column plastic hinges with minimum permanent damage. The major gap that the proposed study will address is experimental data and calibrated analytical studies of the earthquake performance of bridge systems. Unlike past studies that have generally been on components, the proposed research will include system response in addition to component behavior. Modern wireless sensors will be further developed as a part of this project and used in the shake table studies. The results of the study are expected to facilitate the evaluation of existing and emerging bridge seismic codes, provide information for performance-based seismic design, help understand the system response, determine the effectiveness of FRP piers, evaluate potential of wireless sensors in large-scale testing, and demonstrate the feasibility of innovative serviceable bridge columns after strong earthquakes. New data and metadata models are envisioned to facilitate incorporation of the new information obtained in the project in the data repository planned by the NEES Consortium. Broader Impact: The broader impact of the proposed project will consist of its strong educational thrust and it overall societal impact. Through the new knowledge generated as a results of this project in multiple forms, the study will (1) directly train post-doctoral fellows, graduate students, and undergraduate students at several universities using the latest state-of-the-art technology in earthquake engineering research and information technology,(2) educate K-12 students, teachers, and the public about bridge earthquake engineering, (3) integrate teaching and research at introductory and advanced college courses, (4) develop teaching modules for high schools, (5) develop an interactive website, (6) improve basic understanding of the societal role of earthquake engineers, and (7) motivate K-12 students to increase the likelihood of all talented students, women, minorities, and others to seriously consider earthquake engineering as a profession. The overall societal impact of the proposed project will be (a)training of skilled earthquake engineers with state-of-the-art NEES equipment to improve the human resource pool, (b) improving public understanding and perception of the critical role of earthquake engineering in the society, (c)generating verified information based on research conducted by a strong team of multidisciplinary researchers from several US and two overseas universities,(d) providing impetus for reliable implementation of performance-based design of new and retrofit of existing bridges in design codes to ensure safe bridges and to reduce economic loss in future strong earthquakes, (e)increasing the awareness of the earthquake engineers about innovative materials and their potential to keep bridges operational even after strong earthquakes, (f)improving global understanding by interaction and international exchange opportunities provided by this project with international collaborators, and (g)providing opportunities for several potential payload projects that could further enhance the growth of a number of high caliber faculty, several of whom are recipients of past NSF Career or other awards.