NEESR-CR: Post-Tensioned Coupled Shear Wall Systems

NEESR-CR：后张耦合剪力墙系统

• 批准号: 1041598
• 负责人: Yahya Kurama
• 金额: $ 89.45万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-11-01 至 2014-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1041598&HistoricalAwards=false
• 关键词: NEESR; CR; Post; Tensioned; Coupled

This award is an outcome of the NSF 09-524 program solicitation, "George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) Research (NEESR)" competition and includes the University of Notre Dame (lead institution), the University of Texas at Tyler (subaward), and Lehigh University (subaward). This project will utilize the NEES equipment site at Lehigh University. This award investigates the feasibility of a new structural system for seismic regions, i.e., a seismic-resistant reinforced concrete (RC) coupled shear wall system where the widely-used, unbonded post-tensioned (PT) RC floor slab construction method is adapted for coupling (i.e., link) beams to develop coupling forces between the wall piers. The research objective is to develop a coupled wall system that provides significant performance, construction, and economic benefits, and that sustains little damage during a severe earthquake, over currently used shear walls coupled with diagonally reinforced coupling beams. Intellectual Merit: The primary intellectual merit of the research is the investigation of a new and more practical type of earthquake-resistant RC coupled building wall system with significant performance and economic benefits over conventional systems. Typical coupling beams in current construction are difficult to construct (they require large amounts of reinforcing steel arranged in complex geometries) and can experience considerable damage under seismic loading. In comparison, the primary reinforcement in the coupling beams of the new system consists of a single unbonded PT tendon, greatly simplifying construction. This system represents a significant innovation and transformation, but one that can be realistically achieved by utilizing an existing and widely-used technology. The deformations in the coupling beams occur primarily in the form of gap opening at the ends, resulting in little damage as the structure displaces laterally during a large earthquake. After the earthquake, the PT tendons provide a restoring force that closes the gaps and pulls the structure back toward its undeformed, plumb position. The single major barrier to the use of these structures in seismic regions is the lack of experimentally-validated design methods, construction procedures, and numerical simulation models. To fill this knowledge gap, large-scale physical laboratory experiments integrated with computer simulations of multi-story coupled wall structures will be conducted. The laboratory specimens will include the first three floors, tributary slabs, and foundations of two prototype systems, representing the most critical regions of the structures. The other (less critical) regions of the structures will be simulated in the computer resulting in a hybrid physical-computational research platform. Deformations of the laboratory structures will be monitored using multiple, three-dimensional, digital image correlation sensors, and the resulting near-full-field data will inform the other project areas. Ultimately, this information will lead to the development of validated design procedures and modeling/prediction tools for the new system.Broader Impacts: RC coupled wall building structures are common in the United States. The research will provide direct service to society by pursuing the practical adoption of a new type of coupled wall system, thereby improving construction economy and mitigating future earthquake losses. Practicing engineers will participate in an advisory panel, and interactions with relevant professional organizations will facilitate rapid dissemination of the results to end users. Implementation of multiple-sensor digital image correlation for building structural evaluation is another innovative aspect of the work that can aid in adoption of this technology in other similar research programs. The research team includes faculty and students from a predominantly undergraduate institution (University of Texas at Tyler) with a new and growing civil engineering department whose research and educational activities will be impacted by this project. The researchers will also use the project to educate future engineers through K-12 classroom presentations and telepresence sessions. The dissemination, outreach, and technology transfer activities will utilize NEEShub resources. Data from this project will be archived and made available to the public through the NEES data repository. This award is part of the National Earthquake Hazards Reduction Program (NEHRP).

该奖项是NSF 09-524计划征集的结果，“乔治·E·布朗（George E. Brown，Jr。E.该项目将利用Lehigh University的NEES设备网站。该奖项调查了新的地震区域的新结构系统的可行性，即，抗震抗性的钢筋混凝土（RC）耦合剪切壁系统，在该系统中，使用广泛使用的，无基的后张紧（PT）RC地板平板施工方法适用于coupling（即，链接）将COUPER peors porter porter porter porter porter porter。研究目标是开发一个耦合的壁系统，该系统可提供明显的性能，构建和经济利益，并且在严重地震期间几乎没有损坏，而不是当前使用的剪切壁，以及对角增强耦合梁的结合。 知识分子的优点：研究的主要知识优点是对一种新型且更实用的抗震RC耦合建筑墙系统的调查，对传统系统具有显着的性能和经济利益。当前结构中的典型耦合光束难以构造（它们需要大量的钢筋以复杂的几何形式排列），并且在地震载荷下可能会造成相当大的损坏。相比之下，新系统的耦合光束中的主要加固由单个无键的PT肌腱组成，从而大大简化了结构。该系统代表了一个重大的创新和转型，但是可以通过利用现有和广泛使用的技术来实现现实实现的创新。耦合光束的变形主要以末端的间隙开口形式出现，由于结构在大地震期间横向移动，因此损坏很小。地震后，PT肌腱提供了恢复力，可缩小缝隙，并将结构拉回其未呈现的铅垂位置。在地震区域使用这些结构的单个主要障碍是缺乏实验验证的设计方法，施工程序和数值模拟模型。为了填补这一知识差距，将进行与多层耦合壁结构的计算机模拟集成的大型物理实验室实验。实验室标本将包括前三层，支流板以及两个原型系统的基础，代表结构中最关键的区域。这些结构的另一个区域将在计算机中进行模拟，从而产生混合物理计算的研究平台。实验室结构的变形将使用多个，三维的数字图像相关传感器进行监控，所得的近乎满足的数据将为其他项目领域提供信息。最终，此信息将导致开发经过验证的设计程序和新系统的建模/预测工具。Broader的影响：RC耦合的墙壁建筑结构在美国很常见。这项研究将通过实际采用新型的耦合墙系统来为社会提供直接服务，从而改善建筑经济并减轻未来的地震损失。执业工程师将参加咨询小组，与相关专业组织的互动将有助于将结果迅速传播给最终用户。实施用于构建结构评估的多传感器数字图像相关性是工作的另一个创新方面，可以帮助在其他类似的研究计划中采用该技术。 研究团队包括来自本科机构（得克萨斯大学泰勒分校）的教职员工和一个新的土木工程部门，其研究和教育活动将受到该项目的影响。研究人员还将利用该项目通过K-12课堂演示和远程介绍会议来教育未来的工程师。传播，推广和技术转移活动将利用Neeshub资源。该项目的数据将通过NEES数据存储库进行存档并提供给公众。该奖项是国家地震危害计划（NEHRP）的一部分。