Modeling of RC/SRC Systems with Flexibility-Based Models

使用基于灵活性的模型对 RC/SRC 系统进行建模

• 批准号: 9520282
• 负责人: Enrico Spacone
• 金额: $ 15.87万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-08-01 至 1999-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9520282&HistoricalAwards=false
• 关键词: Modeling; RC; SRC; Systems; Flexibility

9520282 Spacone The main objective of this project is to develop a set of realistic models for the nonlinear static and dynamic analysis of composite frames. A full comprehension of the behavior of composite structures is still to be achieved. The behavior of composite members involves complex phenomena such as the partial bond transfer between steel and concrete subjected to cyclic loadings. The ability to understand and model this behavior is important for the evaluation of existing civil infrastructure systems as well as for the design of new structures. A novel frame element formulation based on the flexibility method of structural analysis will be made: The new formulation is effective in modeling the nonlinear response of reinforced concrete frames subjected to seismic inputs. The new formulation offers several advantages over classical stiffness formulations. The new formulation will be applied to formulate new member models for composite beams and SRC columns. These models will include the effects of partial bond between steel and concrete under large element deformations. It will also consider both nonlinear material and geometric effects. A small series of experimental tests on SRC columns will be performed to better understand the behavior of composite columns and to calibrate the new analytical models. The proposed models will be validated through a set of correlation tests, using advanced identification- optimization techniques. Finally, a set of parametric tests on small scale composite frames under both quasi-static cyclic loadings and input ground motions will be conducted. The flexibility-based models investigated here in this project will lead to a reliable assessment of the state-of-health and safety of existing civil infrastructure systems. The new models can be used as a research and practical tool for attaining a better understanding of the complicated behavior of composite frames, wh ich can eventually lead to the development of improved design procedures. This is a project supported under the year 1 program on the Civil Infrastructure Systems initiative NSF 94-145. ***

9520282 Spacone本项目的主要目标是开发一套现实的模型，用于复合材料框架的非线性静态和动态分析。 对复合材料结构的性能的全面理解仍有待实现。 组合构件的性能涉及复杂的现象，如钢和混凝土之间的部分债券转移承受循环荷载。 理解和模拟这种行为的能力对于评估现有的民用基础设施系统以及新结构的设计非常重要。 本文提出了一种基于结构分析柔度法的新型框架单元公式：该公式能有效地模拟钢筋混凝土框架在地震输入下的非线性响应。 新的配方提供了几个优点，经典的刚度配方。 新的公式将被应用到制定新的成员模型的组合梁和SRC柱。 这些模型将包括在大单元变形下钢和混凝土之间的部分粘结的影响。 它还将考虑非线性材料和几何效应。 将对SRC柱进行一系列的实验测试，以更好地了解复合柱的性能，并校准新的分析模型。 所提出的模型将通过一组相关性测试进行验证，使用先进的识别优化技术。 最后，进行了一组小尺度组合框架在拟静力循环荷载和输入地震动作用下的参数试验。 本项目中研究的基于灵活性的模型将对现有民用基础设施系统的健康和安全状况进行可靠的评估。 新的模型可以作为一个研究和实用的工具，以达到更好地了解复杂的行为的组合框架，这可能最终导致改进的设计程序的发展。 这是一个在民用基础设施系统倡议NSF 94-145的第一年计划下支持的项目。 ***