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Advanced Characterization of Inelastic Performance of Tall Buildings to Wind for Performance-Based Design

高层建筑抗风非弹性性能的高级表征，用于基于性能的设计

基本信息

批准号：
2153189
负责人：
Xinzhong Chen
金额：
$ 33.81万
依托单位：
Texas Tech University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2022
资助国家：
美国
起止时间：
2022-07-01 至 2025-06-30
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2153189&HistoricalAwards=false
关键词：
Advanced Characterization Inelastic Performance Tall

项目摘要

This research project will develop efficient analysis frameworks for assessing the inelastic response of tall buildings under wind loads, which can be used to support performance-based wind design (PBWD). Current building design for wind loads does not explicitly permit structures to behave beyond the linear elastic limit, even under ultimate wind loads. This linear design approach may limit the use of more innovative tall building systems with improved performance, safety, and economy. There is very little information concerning the nonlinear inelastic performance of tall buildings to wind in terms of the actual capacity and reliability of buildings against extreme wind loads. This project will address the critical research needs and close the knowledge gap for achieving PBWD of tall buildings with consideration of inelastic behavior. The project outcomes will be used to enrich instruction and training of graduate students. This award will contribute to the National Science Foundation (NSF) role in the National Windstorm Impact Reduction Program (NWIRP). Project data will be archived and made publicly available in the NSF-supported Natural Hazards Engineering Research Infrastructure (NHERI) Data Depot (https://www.DesignSafe-ci.org). Computational tools developed under this project will be integrated with software framework of the NSF-supported NHERI Computational Modeling and Simulation Center. This research project has three specific objectives. First, the project will characterize the inelastic performance of tall buildings using high-fidelity, three-dimensional, nonlinear finite element building models with different heights and building structural systems under realistic three-dimensional dynamic wind loads. The response analysis will shed new insights on the unique characteristics of inelastic building response; biaxial and triaxial response interactions; influence of P-Delta, strength deterioration, and stiffness degradation; and influence of eccentricities in mass and rigidity. Second, the project will develop reduced-order nonlinear building models and analysis frameworks for assessing probabilistic inelastic response. Modal push-over analysis under uniaxial, biaxial, and triaxial loads will be implemented to generate hysteretic generalized force models and to develop reduced-order nonlinear building models with computational efficiency. The accuracy of reduced-order building models will be validated through comprehensive response history analysis and comparison with the predictions from the high-fidelity nonlinear finite element models. Statistical linearization approaches will be developed to further facilitate the predictions of inelastic response statistics. Third, the project will establish frameworks for assessing the reliability of buildings with inelastic performance. Various uncertainties involved in the assessment of inelastic limit state building responses will be modelled and assessed. The fragility functions associated with multiple demands at different mean wind speeds and directions will be evaluated, and will be further integrated with the joint probability distribution of wind speed and direction for evaluation of building system reliability. The directionality effect of wind climate and aerodynamics on inelastic building performance will be evaluated for better building design to wind.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.

该研究项目将开发有效的分析框架来评估高层建筑在风荷载作用下的非弹性响应，该框架可用于支持基于性能的风设计(PBWD)。目前的建筑风荷载设计不明确地允许结构的行为超过线弹性极限，即使在极限风荷载下也是如此。这种线性设计方法可能会限制更多具有更高性能、安全性和经济性的创新高层建筑系统的使用。关于高层建筑在风作用下的非线性非弹性性能，关于建筑抵抗极端风荷载的实际能力和可靠性的信息很少。该项目将解决关键的研究需求，并弥合知识差距，以实现高层建筑的PBWD考虑非弹性行为。项目成果将用于丰富研究生的指导和培训。该奖项将为国家科学基金会(NSF)在国家减少风暴影响计划(NWIRP)中的作用做出贡献。项目数据将在国家科学基金会支持的自然灾害工程研究基础设施(NHERI)数据仓库(https://www.DesignSafe-ci.org).)中存档并公开提供在该项目下开发的计算工具将与NSF支持的NHERI计算建模和仿真中心的软件框架相结合。这项研究项目有三个具体目标。首先，该项目将使用不同高度的高保真三维非线性有限元建筑模型和真实三维动态风荷载下的建筑结构系统来表征高层建筑的非弹性性能。响应分析将对非弹性建筑反应的独特特性、双向和三轴反应相互作用、P-Delta、强度劣化和刚度退化的影响以及质量和刚度偏心的影响提供新的见解。其次，该项目将开发用于评估概率非弹性响应的降阶非线性建筑模型和分析框架。在单轴、双向和三轴荷载作用下，将进行模态Push-over分析，以生成滞回的广义力模型，并建立具有计算效率的降阶非线性建筑模型。通过全面的反应时程分析，并与高保真非线性有限元模型的预测结果进行比较，验证降阶建筑模型的准确性。将开发统计线性化方法，以进一步促进对非弹性响应统计的预测。第三，该项目将建立评估具有非弹性性能的建筑物的可靠性的框架。将对非弹性极限状态建筑反应评估中涉及的各种不确定性进行建模和评估。评估在不同平均风速和风向下与多种需求相关联的易损性函数，并将其进一步与风速和风向的联合概率分布相结合，用于建筑系统可靠性评估。将评估风、气候和空气动力学对非弹性建筑性能的方向性影响，以便更好地进行建筑设计。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。