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: 1762119
• 负责人: Rigoberto Burgueno
• 金额: $ 33.97万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-06-01 至 2020-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1762119&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.

结构工程中的一个重大挑战是开发能够抵抗极端自然灾害（如飓风或地震）的建筑系统，同时将损坏降至最低或没有损坏。这种建筑系统可以在极端事件发生后立即投入使用，并将经济损失降至最低，从而促进国家的持续繁荣和福祉。随着建筑物中无粘结后张剪力墙（UPSW）的发展，在解决这一挑战方面取得了进展;但设计此类剪力墙的限制问题仍然存在。本研究将探索一种创新的概念，结构剪力墙，以抵抗建筑物的横向荷载，并在极端事件中无损伤。这个概念包括耦合，无粘结，后张，钢筋混凝土墙，通过曲面与基础相互作用。当壁沿着底部曲面滑动时，将通过一个类似于运动的运动来适应横向变形。横向阻力将由沿曲面和垂直无粘结后张缆索的沿着摩擦力提供。后张索也将有助于恢复墙的初始配置。这些耦合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，系统响应将利用所产生的变形，而不是像传统系统那样试图约束它们。其结果将是与无损伤结构建筑系统设计相关的新技术，以及利用系统几何形状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部分，包括培训两名博士。该项目还包括为大学生提供的研究经验、为大学生、研究生和从业人员提供的教程和研究成果的项目网站以及为初中和高中学生提供的外联活动。 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库（https：//www.example.com）中公开提供。www.designsafe-ci.org本研究的核心思想是一种新的设计理念，设想不受传统材料失效极限状态的限制。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，该项目的目标是开发一种新概念的UPSWs，可以执行无损伤和不受材料失效极限状态的理论和技术。这一目标将通过两个独特且互补的特征来实现：（1）单独的墙沿着圆形路径滑动，在基脚界面处没有分离，以及（2）通过沿着垂直墙接头具有可控弹性不稳定性的装置进行连续能量耗散。这个概念将被指定为一个钟摆UPSW系统，因为它围绕墙上的一个固定点旋转。要遵循的方法将是在平面内的响应的钟摆UPSWs作为可行的横向负载抵抗元件的特征，开发和表征使用弹性元材料和元结构通过弹性不稳定性耗散能量，并表征响应的钟摆UPSWs耦合弹性多稳定结构作为连接器。将使用分析、数值（有限元）和实验方法相结合的方法。这项研究将导致系统的几何形状和变形的基本整合的抗横向荷载结构的设计是有弹性的和可持续的。该研究将促进新的设计概念，利用变形实现最佳性能，而不是将性能目标设定为目标材料极限状态。该研究也将有助于在大型结构系统中使用非线性弹性不稳定性。该奖项反映了NSF的法定使命，并通过使用基金会的知识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

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

Response characterization of multistable shallow domes with cosine-curved profile

• DOI: 10.1016/j.tws.2019.03.035
• 发表时间: 2019-07-01
• 期刊: THIN-WALLED STRUCTURES
• 影响因子: 6.4
• 作者: Alturki, Mansour;Burgueno, Rigoberto
• 通讯作者: Burgueno, Rigoberto