NEESR II; System Behavior Factors For Composite And Mixed Structural Systems

NEESR II；

• 批准号: 0619047
• 负责人: Roberto Leon
• 金额: --
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-10-01 至 2010-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0619047&HistoricalAwards=false
• 关键词: NEESR; II; System; Behavior; Factors

Abstract 0619047LeonThis award is an outcome of the NSF 06-504 program solicitation "George E. Brown, Jr. Network for Earthquake Engineering Simulation Research (NEESR)" competition. Intellectual Merit: This proposal will develop system performance factors (R, Cd, and Wo) for composite frame structural systems and provide practical guidelines for the analysis and design of such structures. This project will use the NEES MAST Facility at the University of Minnesota to test a series of full-scale slender composite beam-columns to develop data on the evolution of the stiffness and strength of these elements when subjected to large lateral displacements. The project will produce a unique set of data to verify advanced analytical models and provide support for the development of both simplified and advanced analysis techniques for composite and mixed structures. This data will fill gaps in the current databases and provide a unique series of well-controlled tests to allow for the calibration of advanced, fiber-based analytical models for composite beam-columns. Experimental data will be collected on the behavior and performance of connections of composite beam-columns to beams and foundations to calibrate component models. Some of the more challenging tasks to be addressed include development of models for the progressive cyclic deterioration of strength and stiffness of beam-columns and their connections within composite frames, the effect of long term effects such as creep and shrinkage, the force transfer along the composite interface and at column bases and connections, and the necessary instrumentation to discriminate between the many mechanisms of strength, stiffness, and deformation capacity that will be necessary to properly understand the behavior of composite beam-columns systems. The main deliverables will be: (1) a series of design recommendations formatted in code language for direct incorporation into the revised structural system tables being developed for the 2010/11 cycle of ASCE 7 and the AISC Seismic Provisions, along with design examples to illustrate and clarify their applicability; and (2) a detailed description of the advanced models developed that will help researchers pursue similar studies for other composite and mixed structural systems. This research addresses directly Basic Research Needs #1 (development of rational elastic design parameters), #4 (connections to column bases), #12 (use of high strength steel), #19 (mixed and composite structures), and #22 and #23 (composite columns) in the Building Seismic Safety Council Research Needs document referenced in the NSF 06-504 solicitation. Broader Impacts: The results of this project will be in a format that can be directly incorporated into design codes and will span a wide range of material properties (3 ksi f'c 15 ksi and 36 ksi Fy 80 ksi), a range of material strengths that is not currently contemplated by design specifications. The objective is to encourage the use of composite systems in buildings in the 5 to 20 story range in areas of low, moderate, and high seismicity. In addition, the project will interface with the FACES/AGEP project at Georgia Tech to provide minority undergraduates with research experience. Finally, the project will provide preliminary guidelines suitable for being adapted to the upgrading of existing structures through the use of external confinement (FRP and similar) for encased sections and infilling with lightweight cementitious materials for hollow structural sections.

摘要0619047莱昂这个奖项是NSF 06-504计划征求“乔治E。小布朗地震工程模拟研究网络（NEESR）竞赛。 智力优势： 本提案将为复合框架结构系统开发系统性能系数（R、Cd和Wo），并为此类结构的分析和设计提供实用指南。该项目将使用明尼苏达大学的NEES MAST设施来测试一系列全尺寸细长复合材料梁柱，以开发关于这些元件在承受大侧向位移时刚度和强度演变的数据。该项目将产生一套独特的数据，以验证先进的分析模型，并为复合材料和混合结构的简化和先进分析技术的发展提供支持。这些数据将填补当前数据库中的空白，并提供一系列独特的良好控制的测试，以校准先进的基于纤维的复合材料梁柱分析模型。将收集有关组合梁柱与梁和基础连接的行为和性能的实验数据，以校准组件模型。一些更具有挑战性的任务包括发展的模型，逐步循环退化的强度和刚度的梁柱及其连接在组合框架内，长期效应的影响，如徐变和收缩，力传递沿着组合界面和柱脚和连接，和必要的仪器，以区分许多机制的强度，刚度，和变形能力，这将是必要的，以正确理解的行为组合梁-柱系统。 主要交付成果将是：（1）一系列以规范语言格式化的设计建议，以直接纳入为ASCE 7和AISC抗震规定的2010/11周期编制的修订结构系统表中，沿着设计示例，以说明和澄清其适用性;以及（2）对所开发的先进模型的详细描述，这将有助于研究人员对其他复合材料和混合结构系统进行类似的研究。 本研究直接解决了NSF 06-504招标中引用的建筑抗震安全理事会研究需求文件中的基础研究需求#1（合理弹性设计参数的开发）、#4（柱脚连接）、#12（高强度钢的使用）、#19（混合和组合结构）以及#22和#23（组合柱）。更广泛的影响：该项目的结果将采用可直接纳入设计规范的格式，并将涵盖广泛的材料特性（3 ksi f 'c 15 ksi和36 ksi Fy 80 ksi），这是目前设计规范未考虑的材料强度范围。其目的是鼓励在低、中、高地震活动地区的5至20层建筑中使用复合系统。此外，该项目将与格鲁吉亚理工学院的FACES/AGEP项目对接，为少数民族本科生提供研究经验。 最后，该项目将提供初步指导方针，适用于通过使用外部约束（FRP和类似物）对封闭部分进行改造，并在空心结构部分填充轻质水泥材料，对现有结构进行改造。