Collaborative Research: Self-Centering Pendulum Shear Walls in Buildings via Nonlinear Elastic Kinematics

合作研究：通过非线性弹性运动学实现建筑物中的自定心摆剪力墙

• 批准号: 2035690
• 负责人: Rigoberto Burgueno
• 金额: $ 33.97万
• 依托单位: SUNY at Stony Brook
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-06-01 至 2024-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2035690&HistoricalAwards=false
• 关键词: Collaborative; Research; Self; Centering; Pendulum

A grand challenge in structural engineering is to develop building systems that can resist loads from extreme natural hazards, such as hurricanes or earthquakes, with minimum or no damage. Such building systems could enable immediate occupancy and minimum economic losses after an extreme event, contributing to continued national prosperity and welfare. Progress has been made towards addressing this challenge with the development of unbonded, post-tensioned, shear walls (UPSWs) in buildings; yet limiting issues for designing such shear walls remain. This research will explore an innovative concept for structural shear walls to resist lateral loads in buildings and perform damage free during an extreme event. The concept consists of coupled, unbonded, post-tensioned, reinforced concrete walls that interact with the foundation via a curved surface. Lateral deformations will be accommodated through a pendulum-type motion as the wall slides along the bottom curved surface. Lateral resistance will be provided by friction along the curved surface and the vertical unbonded post-tensioned cables. The post-tensioned cables also will help restore the wall to its initial configuration. Energy dissipation of these coupled pendulum walls will be provided by incorporating connecting devices that use elastic buckling and release accumulated elastic energy during the walls' deformations. The system response thus will leverage the resulting deformations rather than trying to constrain them, as in traditional systems. The result will be new technology related to the design of damage-free structural building systems, and a new way of thinking about leveraging system geometry and deformations for enhanced resilient and sustainable buildings. Parallel to the research effort will be complementary educational and outreach components, including the training of two Ph.D. students, research experiences for undergraduate students, a project website with tutorials and research findings for undergraduate and graduate students and practitioners, and outreach activities for middle and high school students. The tutorials, as well as data from this project, also will be made publicly available in the NSF-supported Natural Hazards Engineering Research Infrastructure Data Depot (https://www.designsafe-ci.org). The core idea of this research is that of a new design philosophy envisioned to be unrestricted by traditional material failure limit states. This philosophy will be verified through a new concept for coupled UPSWs. The material response limitations of rocking UPSWs will be addressed by harnessing the nonlinear kinematic behavior resulting from coupled system deformations. Thus, the project objective is to develop the enabling theory and technology for a new concept of UPSWs that can perform damage free and unrestricted by material failure limit states. This objective will be achieved through two unique and complementary features: (1) individual walls gliding along a circular path with no separation at the footing interface, and (2) continuous energy dissipation via devices with controllable elastic instabilities along vertical wall joints. This concept will be designated as a pendulum UPSW system, as it rotates about a fixed point on the wall. The approach to be followed will be to characterize the in-plane response of pendulum UPSWs as viable lateral load resisting elements, develop and characterize the use of elastic meta-materials and meta-structures for dissipating energy via elastic instabilities, and characterize the response of pendulum UPSWs coupled with elastic multi-stable structures as connectors. A combination of analytical, numerical (finite element), and experimental methods will be used. This research will lead to the fundamental integration of system geometry and deformations for the design of lateral load resisting structures that are resilient and sustainable. The study will promote new design concepts that harness deformations for optimal performance rather than performance objectives set to target material limit states. The research also will contribute to the use of nonlinear elastic instabilities in large-scale structural systems. Theory and methods related to damage-free structural systems, friction models, and elastic energy dissipation devices will also be advanced.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

结构工程的一个巨大挑战是开发能够抵抗极端自然灾害（例如飓风或地震）荷载的建筑系统，而损坏程度最小或没有损坏。这种建筑系统可以在极端事件发生后立即入住并将经济损失降至最低，从而为国家的持续繁荣和福祉做出贡献。随着建筑物中无粘结后张剪力墙 (UPSW) 的开发，在应对这一挑战方面已经取得了进展；然而设计这种剪力墙的限制问题仍然存在。这项研究将探索结构剪力墙的创新概念，以抵抗建筑物的侧向荷载并在极端事件期间实现无损坏。该概念由耦合的、无粘结的、后张的钢筋混凝土墙组成，这些墙通过弯曲的表面与地基相互作用。当墙壁沿着底部曲面滑动时，横向变形将通过钟摆式运动来调节。横向阻力将由沿弯曲表面和垂直未粘合后张拉索的摩擦力提供。后张拉索还有助于将墙恢复到其初始配置。这些耦合的摆壁的能量耗散将通过结合使用弹性屈曲并在壁变形期间释放累积的弹性能量的连接装置来提供。因此，系统响应将利用由此产生的变形，而不是像传统系统那样试图限制它们。其结果将是与无损结构建筑系统设计相关的新技术，以及利用系统几何和变形来增强弹性和可持续建筑的新思维方式。与研究工作并行的是补充性的教育和推广活动，包括培训两名博士生。学生、本科生的研究经历、为本科生、研究生和从业者提供教程和研究成果的项目网站，以及针对初中生和高中生的外展活动。 这些教程以及该项目的数据也将在 NSF 支持的自然灾害工程研究基础设施数据仓库 (https://www.designsafe-ci.org) 中公开提供。这项研究的核心思想是一种不受传统材料失效极限状态限制的新设计理念。这一理念将通过耦合 UPSW 的新概念得到验证。摇摆 UPSW 的材料响应限制将通过利用耦合系统变形产生的非线性运动学行为来解决。因此，该项目的目标是为 UPSW 的新概念开发支持理论和技术，使其能够无损坏且不受材料失效极限状态的限制。这一目标将通过两个独特且互补的功能来实现：(1) 各个墙壁沿着圆形路径滑动，在基础界面处没有分离；(2) 通过沿着垂直墙壁接缝具有可控弹性不稳定性的装置连续耗散能量。这个概念将被指定为摆式 UPSW 系统，因为它绕墙上的固定点旋转。遵循的方法是将摆式 UPSW 的面内响应表征为可行的横向负载抵抗元件，开发和表征弹性超材料和元结构的使用，以通过弹性不稳定性耗散能量，并表征与作为连接器的弹性多稳态结构耦合的摆式 UPSW 的响应。将结合使用分析、数值（有限元）和实验方法。这项研究将导致系统几何和变形的基本整合，以设计具有弹性和可持续性的横向荷载结构。该研究将推广新的设计概念，利用变形来实现最佳性能，而不是设定为目标材料极限状态的性能目标。该研究还将有助于非线性弹性不稳定性在大型结构系统中的应用。与无损结构系统、摩擦模型和弹性耗能装置相关的理论和方法也将得到推进。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Multistable Cosine-Curved Dome System for Elastic Energy Dissipation

• DOI: 10.1115/1.4043792
• 发表时间: 2019-09
• 期刊: Journal of Applied Mechanics
• 作者: Mansour Alturki;R. Burgueño

Equivalent viscous damping for a system with energy dissipation via elastic instabilities

• DOI: 10.1016/j.engstruct.2020.110753
• 发表时间: 2020-10
• 期刊: Engineering Structures
• 影响因子: 5.5
• 作者: Mansour Alturki;R. Burgueño

Nonlinear Dynamic FEM Analysis of Unbonded Posttensioned Coupled Pendulum Shear Walls Linked with Elastic Energy Dissipating Connectors

与弹性耗能连接件连接的无粘结后张连摆剪力墙的非线性动态有限元分析

• 发表时间: 2022
• 期刊: Proceedings of the 12th National Conference in Earthquake Engineering
• 作者: Silva, P.F.

Self-Centering Pendulum Shear Walls via Nonlinear Elastic Kinematics

通过非线性弹性运动学的自定心摆剪力墙

• 发表时间: 2020
• 期刊: 17th World Conference on Earthquake Engineering
• 作者: Silva, P.F.;Dunne, J.;Burgueño, R.
• 通讯作者: Burgueño, R.

Architected materials for tailorable shear behavior with energy dissipation

• DOI: 10.1016/j.eml.2019.01.010
• 发表时间: 2019-04-01
• 期刊: EXTREME MECHANICS LETTERS
• 影响因子: 4.7
• 作者: Liu, Suihan;Azad, Ali Imani;Burgueno, Rigoberto
• 通讯作者: Burgueno, Rigoberto