RIA: Three-Dimensional Nonlinear Cyclic Analysis of Concrete-Filled Tube Beam-Columns and Composite Subassemblies

RIA：混凝土管梁柱和组合组件的三维非线性循环分析

• 批准号: 9410473
• 负责人: Jerome Hajjar
• 金额: $ 11万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-09-15 至 1998-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9410473&HistoricalAwards=false
• 关键词: RIA; Three; Dimensional; Nonlinear; Cyclic

9410473 Hajjar This is a Research Initiation Award to study the force displacement response and ultimate strength behavior of composite subassemblies of unbraced frames. Structural engineers are increasingly realizing the economic benefits of using concrete filled steel tube (CFT) beam-columns in low and medium-rise construction, and they expect the demand for CFTs to grow significantly in the next decade. Detailed but efficient numerical simulation, coupled with experimental research, is the only practical means of understanding CFT behavior. Yet only insufficient research has been conducted on CFTs to date. The subassemblies to be studied in this project consist of steel I girders framing into rectangular CFT beam-columns subjected to either monotonic or cyclic loading. The project's objectives are: 1) to develop a practical, three-dimensional, nonlinear, fiber-based finite element formulation to represent CFT beam columns; 2) to develop compatible nonlinear models to represent the girder-to-column connection and panel zone region; 3) to implement these formulations in an existing composite frame analysis system, and to calibrate the formulations against experimental data; and 4) to conduct comprehensive parametric studies of individual CFT beam- columns and composite subassemblies. The parametric studies will be conducted to provide the data required to improve the accuracy and scope of current non-seismic and seismic design specification provisions. This fiber analysis will also facilitate investigation of new composite CFT systems, and permit experimentalists to both predict and interpret their test results. ***

9410473 Hajjar 这是一项研究启动奖，旨在研究无支撑框架复合材料组件的力位移响应和极限强度行为。 结构工程师越来越认识到在中低层建筑中使用钢管混凝土 (CFT) 梁柱的经济效益，他们预计未来十年对 CFT 的需求将显着增长。 详细而有效的数值模拟与实验研究相结合，是理解 CFT 行为的唯一实用方法。 然而迄今为止，对 CFT 的研究还不够充分。 该项目中要研究的组件由 I 型钢梁组成，框架形成矩形 CFT 梁柱，承受单调或循环载荷。 该项目的目标是： 1) 开发实用的、三维的、非线性的、基于纤维的有限元公式来表示 CFT 梁柱； 2）开发兼容的非线性模型来表示梁与柱的连接和面板区域； 3）在现有的复合框架分析系统中实施这些公式，并根据实验数据校准公式； 4) 对单个 CFT 梁柱和复合材料组件进行全面的参数研究。 将进行参数研究，以提供提高当前非地震和抗震设计规范规定的准确性和范围所需的数据。这种纤维分析还将促进新型复合材料 CFT 系统的研究，并允许实验人员预测和解释他们的测试结果。 ***