An Uplift Friction Damper for Seismically Resilient Mass-Timber Buildings

用于抗震实体木结构建筑的提升式摩擦阻尼器

• 批准号: 2025449
• 负责人: Daniel Dowden
• 金额: $ 20.45万
• 依托单位: Michigan Technological University
• 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: 2020-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2025449&HistoricalAwards=false
• 关键词: Uplift; Friction; Damper; Seismically; Resilient

This award will investigate a low-damage solution for cross-laminated timber (CLT) seismic force-resisting systems (SFRSs) using a novel uplift friction damper (UFD) device for seismically resilient mass-timber buildings. The UFD device will embrace the natural rocking wall behavior that is expected in tall CLT buildings, provide stable energy dissipation, and exhibit self-centering characteristics. Structural repair of buildings with these devices is expected to be minimal after a design level earthquake. Although CLT has emerged as a construction material that has revitalized the timber industry, there exists a lack of CLT-specific seismic energy dissipation devices that can integrate holistically with the natural kinematics of CLT-based SFRSs. CLT wall panels themselves do not provide any measurable seismic energy dissipation. As a payload to the large-scale, ten-story CLT building specimen to be tested on the Natural Hazards Engineering Research Infrastructure (NHERI) shake table at the University of California, San Diego, as part of NSF award 1636164, “Collaborative Research: A Resilience-based Seismic Design Methodology for Tall Wood Buildings,” this project will conduct a series of tests with the UFD devices installed on the CLT building specimen. These tests will bridge analytical and numerical models with the high fidelity test data collected with realistic boundary and earthquake loading conditions. The calibrated models will be incorporated in a probabilistic numerical framework to establish a design methodology for seismically resilient tall wood buildings, leading to a more diverse and eco-sustainable urban landscape. This project will provide local elementary school outreach activities, integrate participation of undergraduate minorities and underrepresented groups into the research activities, and foster graduate level curriculum innovations. Project data will be archived and made available publicly in the NSF-supported NHERI Data Depot (https://www.DesignSafe-CI.org). This award contributes to NSF's role in the National Earthquake Hazards Reduction Program (NEHRP). The research objectives of this payload project are to: 1) bridge the fundamental mechanistic UFD models linking analytical and numerical models necessary for seismic response prediction of seismically resilient CLT-based SFRSs, 2) characterize the fundamental dynamic UFD behavior with validation and calibration through large-scale tests with realistic boundary conditions and earthquake loadings, and 3) integrate low-damage, friction-based damping system alternatives within a resilience-based seismic design methodology for tall wood buildings. To achieve these objectives, the test data collected will provide a critical pathway to reliably establish numerical and analytical models that extend the shake table test results to a broad range of archetype buildings. The seismic performance of mass-timber archetype building systems will be established through collapse risk assessment using incremental dynamic analyses. This will provide a first step in the longer term goal of establishing code-based seismic performance factors for CLT-based SFRSs.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.

该合同将研究交叉层压木材（CLT）抗震系统（sfrs）的低损伤解决方案，该系统使用一种新型的提升摩擦阻尼器（UFD）装置，用于地震弹性大木结构建筑。UFD装置将采用高层CLT建筑中预期的自然摇墙行为，提供稳定的能量耗散，并表现出自定心特性。在设计级地震后，使用这些设备进行建筑物的结构修复预计将是最小的。尽管CLT已经成为一种复兴木材工业的建筑材料，但目前还缺乏能够与基于CLT的sfrs的自然运动学整体集成的CLT专用地震耗能装置。CLT墙板本身不提供任何可测量的地震能量消耗。作为在加州大学圣地亚哥分校自然灾害工程研究基础设施（NHERI）振动台上测试的大型十层CLT建筑样本的有效载荷，作为NSF 1636164奖的一部分，“合作研究：高层木结构建筑的基于弹性的抗震设计方法”，该项目将使用安装在CLT建筑样本上的UFD设备进行一系列测试。这些试验将把分析模型和数值模型与实际边界和地震荷载条件下收集的高保真试验数据结合起来。校准后的模型将被整合到概率数值框架中，以建立具有抗震能力的高层木结构建筑的设计方法，从而形成更加多样化和生态可持续的城市景观。本计画将提供当地小学的外展活动，整合少数族裔及未被充分代表的大学生群体参与研究活动，并促进研究生水平的课程创新。项目数据将存档并在nsf支持的NHERI数据仓库（https://www.DesignSafe-CI.org）中公开提供。该奖项有助于美国国家科学基金会在国家减少地震灾害计划（NEHRP）中的作用。本有效载荷项目的研究目标是：1)建立基本的机械UFD模型，将地震弹性cls sfrs的地震反应预测所需的分析和数值模型连接起来；2)通过具有现实边界条件和地震载荷的大规模试验验证和校准，表征基本的动态UFD行为；3)在基于弹性的高层木结构抗震设计方法中整合低损伤、基于摩擦的阻尼系统替代方案。为了实现这些目标，收集的测试数据将为可靠地建立数值和分析模型提供关键途径，将振动台测试结果扩展到广泛的原型建筑。采用增量动力分析方法，通过倒塌风险评估来确定大木结构原型建筑体系的抗震性能。这将为基于clt的sfrs建立基于规范的抗震性能因子的长期目标迈出第一步。该奖项反映了美国国家科学基金会的法定使命，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。