Collaborative Research: Effect of Vertical Accelerations on the Seismic Performance of Steel Building Components: An Experimental and Numerical Study

该奖项支持使用实验和数值模型评估地震期间垂直加速度对钢结构建筑的影响的研究。关于竖向加速度对建筑物反应影响的试验研究很少。因此，数值模型无法考虑用于预测建筑构件性能的真实数据。在这项研究中，一座接近全尺寸的十层钢结构建筑将在振动台上进行测试，以测量其垂直加速度。实验数据将被用来创建数值模型，以了解梁、柱、板和其他组件在垂直和水平地震动下的行为。数值模型将根据美国设计规范进行修改，以预测根据这些标准和指南设计的钢结构建筑的抗震性能。因此，这项研究将改善美国地震区钢结构建筑的性能，并为研究梁板对建筑物居住者的振动效应提供急需的数据。该项目还将支持地震工程领域的两名博士生。研究成果将通过报告和期刊出版物传播。该项目将为国家科学基金会(NSF)在国家减少地震灾害计划中的作用做出贡献。该项目的数据将存档在美国国家科学基金会支持的自然灾害工程研究基础设施数据仓库(https://www.DesignSafe-ci.org).This Study)中，该研究是与日本国立地球科学研究院(NIED)合作的研究团队，将在位于日本三木的3D全尺寸地震试验设施(E-Defense)六自由度振动台上测试十层钢结构建筑。钢结构建筑包括横向抗弯框架和纵向双重体系，该体系由内防屈曲支撑框架和外抗弯框架组成。非结构构件将安装在多个楼层以及幕墙上。随着地震烈度的单调增加，结构将受到地面运动的影响，结构构件在试验的最后阶段将表现出非线性非弹性行为。研究任务包括：i)在十层钢结构建筑中实施仪器网络，以收集三维地震震动时结构部件上的加速度和变形；ii)使用研究和商业软件平台创建部件和系统有限元模型，从而产生经过验证的建模技术以捕捉三维激励的影响；以及iii)评估垂直地震需求对根据美国实践设计的钢结构建筑结构弹性的影响。这项研究将产生迄今为止关于垂直加速度对钢建筑影响的最完整和最现实的建模知识。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。

This award supports research to evaluate the effect of vertical accelerations on steel buildings during earthquakes using experiments and numerical models. Experimental studies on the impact of vertical accelerations on building response rarely have been conducted. Thus, numerical models cannot account for realistic data to predict the performance of building components. In this study, a near full-scale ten-story steel building will be instrumented to measure its vertical accelerations when tested on a shake table. The experimental data will be used to create numerical models to understand the behavior of beams, columns, slabs, and other components under vertical and horizontal seismic ground motions. The numerical models will be modified according to American design specifications to predict the seismic performance of steel buildings designed according to these standards and guidelines. Therefore, this research will improve the performance of steel buildings in seismic regions of the United States and provide much needed data for investigations on the vibration effects of beams and slabs on building occupants. The project will also support two Ph.D. students in the earthquake engineering field. The research outcomes will be disseminated through reports and journal publications. This project will contribute to the National Science Foundation (NSF) role in the National Earthquake Hazards Reduction Program. Data from this project will be archived in the NSF-supported Natural Hazards Engineering Research Infrastructure Data Depot (https://www.DesignSafe-ci.org).This study is a collaboration with the Japanese National Research Institute for Earth Science and Disaster Resilience (NIED) research team that will test the ten-story steel building on the 3D Full-Scale Earthquake Testing Facility (E-Defense) six-degrees-of-freedom shake table operated by NIED and located in Miki, Japan. The steel building includes moment resisting frames in the transverse direction and a dual system in the longitudinal direction consisting of interior buckling-restrained braced frames and exterior moment resisting frames. Non-structural components will be installed on several floors, as well as curtain walls. The structure will be subjected to ground motions with monotonically increasing seismic intensity, and structural components are expected to exhibit nonlinear inelastic behavior in the final stages of the experiment. The study tasks consist of i) implementing an instrumentation network in the ten-story steel building to collect accelerations and deformations on structural components during three-dimensional seismic shaking, ii) creating subassembly and system finite element models using research and commercial software platforms, resulting in validated modeling techniques to capture the impact of three-dimensional excitations, and iii) assessing the implications of vertical seismic demands on the structural resiliency of steel buildings designed according to U.S. practice. The study will produce the most complete and realistic modeling knowledge to date on the effect of vertical accelerations on steel buildings.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.