NEESR-CR: Steel Truss Systems with Enhanced Seismic Safety and Performance

NEESR-CR：具有增强抗震安全性和性能的钢桁架系统

• 批准号: 0936563
• 负责人: Shih-Ho Chao
• 金额: $ 59.95万
• 依托单位: University of Texas at Arlington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-10-01 至 2015-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0936563&HistoricalAwards=false
• 关键词: NEESR; CR; Steel; Truss; Systems

This award is an outcome of the NSF 09-524 program solicitation "George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) Research (NEESR)" competition and includes the University of Texas, Arlington (lead) and Valparaiso University (subaward). This award will utilize the NEES equipment site at the University of Minnesota, named the Multi-Axial Subassemblage Testing (MAST) Laboratory. The goal of this research is to advance seismic safety and design of building structures by studying two steel truss systems: special truss moment frames (STMFs) and staggered truss frames (STFs). Due to their ability to achieve large column-free floor spaces, STMFs and STFs are unique, valuable options for structural engineers. However, although STMFs and STFs offer a wide range of structural, architectural, and economical benefits, limited research data is available on the seismic performance of these systems. Because previous tests on STMFs do not adequately reflect the current practice in design and detailing, substantial improvement in design methodology and confidence could be gained for STMFs by further research. Despite the strong interest among the engineering community, the application of STFs to seismic regions has been restricted due to lack of research. The project will advance knowledge about the system behavior of STMFs and STFs and recommend innovations to improve the seismic performance of these two truss systems.Intellectual Merit: The NEES-MAST facility will be used to impose cyclic loading on large-scale subassemblages that comprise the fundamental structural unit of a STMF or STF. The large-scale tests will be used to: (1) verify the behavior of STMFs constructed according to recommendations from recent research results; (2) explore specific truss configurations that could enhance the performance of STMFs; (3) clarify the system behavior of STFs under cyclic loading; and (4) identify preferred energy dissipation mechanisms for STFs. The structural engineering laboratory at Valparaiso University will be used to examine the cyclic loading performance of shear-stud connections between steel chord members and hollow core concrete planks. In addition, analytical studies will lead to general nonlinear analysis methods that represent the seismic behavior of STMFs and STFs and generate nonlinear time history analysis data for a set of representative building systems that utilize STMFs or STFs. Results from this research will promote wider use of STMFs and STFs.Broader Impacts: This award will support undergraduate students at Valparaiso University and the University of Minnesota to participate in the research. The PI at Valparaiso University participates in an engineering education initiative to introduce scientific visualization using virtual reality systems. These systems will be used to create three-dimensional (3D) models of both the experimental tests and analytical models. The PIs will use the 3D models to aid dissemination of the research results to the professional and academic communities. The 3D models will also be used to develop educational tools to introduce K-12 and undergraduate students to earthquake engineering research activity, the significance of earthquake effects, and the functions of building structures. The educational tools will be made available in the public domain for use in virtual reality systems or with a traditional computer screen projector. Data from this project will be archived and made available to the public through the NEES data repository.

该奖项是NSF 09-524计划招标的结果，“乔治·E·布朗（George E. Brown，Jr。E.该奖项将利用明尼苏达大学的NEES设备网站，​​名为多轴尺寸测试（MAST）实验室。这项研究的目的是通过研究两个钢制桁架系统来提高建筑结构的地震安全和设计：特殊的桁架矩（STMF）和交错的桁架框架（STFS）。由于他们能够实现大型无柱地板空间，因此STMF和STF是结构工程师的独特，有价值的选择。但是，尽管STMF和STF提供了广泛的结构，建筑和经济利益，但有关这些系统的地震性能的研究数据有限。由于先前对STMF的测试不能充分反映当前的设计和细节实践，因此通过进一步的研究可以为STMF获得设计方法和信心的实质性改善。尽管工程界引起了人们的浓厚兴趣，但由于缺乏研究，STF在地震地区的应用受到限制。该项目将促进有关STMF和STF的系统行为的知识，并建议创新以改善这两个桁架系统的地震性能。IntellectualFure：NEES-MAST设施将用于对构成STMF或STF基本结构单位的大规模尺寸的循环负载。大规模测试将用于：（1）根据最新研究结果的建议验证STMF的行为； （2）探索可以增强STMF性能的特定桁架配置； （3）阐明在循环载荷下STF的系统行为； （4）确定STF的首选能量耗散机制。 Valparaiso大学的结构工程实验室将用于检查钢和弦成员与空心核心混凝土木板之间剪切固定连接的循环载荷性能。此外，分析研究将导致一般的非线性分析方法代表STMF和STF的地震行为，并为利用STMFS或STF的一组代表性建筑系统生成非线性时间历史记录分析数据。这项研究的结果将促进对STMF和STFS的更广泛使用。Broader的影响：该奖项将支持Valparaiso大学和明尼苏达大学的本科生参与研究。瓦尔帕莱索大学的PI参加了一项工程教育计划，旨在使用虚拟现实系统介绍科学可视化。这些系统将用于创建实验测试和分析模型的三维（3D）模型。 PI将使用3D模型来帮助将研究结果传播给专业和学术社区。 3D模型还将用于开发教育工具，以将K-12和本科生引入地震工程研究活动，地震效应的重要性以及建筑结构的功能。教育工具将在公共领域提供，以用于虚拟现实系统或传统的计算机屏幕投影仪。该项目的数据将通过NEES数据存储库进行存档并提供给公众。