Research Initiation: 3-D Response of Reinforced Concrete Beam-Column-Slab Connections

研究启动：钢筋混凝土梁-柱-板连接的 3-D 响应

• 批准号: 8809038
• 负责人: George Voyiadjis
• 金额: $ 7万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-06-01 至 1992-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8809038&HistoricalAwards=false
• 关键词: Research; Initiation; Response; Reinforced; Concrete

Recently the inelastic behavior of beam to column connections interacting with monolithically cast floor slabs has received a considerable attention. In multistory reinforced concrete (RC) frame buildings the poor performance of such connections caused by excessive damage during building deformations can adversely affect the stiffness and strength of the entire structure. A number of beam-column-slab connections have been tested as isolated specimens as well as within the RC test buildings. The objective of the proposed research is to complement such studies by analyzing a number of tested connections using the finite element method. For this purpose a 3-D material response model for simulating concrete behavior in the pre-cracked phase will be implemented. This will be augmented by a macroscopic (smeared) post-cracking constitutive model for concrete which will simulate the cracked material behavior including the strain softening phenomenon as well as the interaction between reinforcement and concrete. A number of parametric and sensitivity studies will be performed. Such analysis will be carried out with the aim of broadening the understanding of the internal load-resisting mechanisms and ultimate capacities in RC beam-column-slab connections. The results of this investigation may also produce valuable information for future development of simplified models capable of simulating the dominant behavior characteristics while retaining simplicity and computational efficiency.

近年来，梁柱连接与整体浇筑楼板相互作用的非弹性性能受到了相当大的关注。在多层钢筋混凝土框架建筑中，由于建筑物变形时的过度破坏导致连接性能不佳，会对整个结构的刚度和强度产生不利影响。许多梁-柱-板连接作为孤立的试件以及在钢筋混凝土试验建筑内进行了测试。提出的研究目的是通过使用有限元方法分析一些已测试的连接来补充这些研究。为此，将建立一个三维材料响应模型来模拟混凝土在预裂阶段的行为。这将通过混凝土的宏观（涂抹）开裂后本构模型来增强，该模型将模拟开裂材料的行为，包括应变软化现象以及钢筋和混凝土之间的相互作用。将进行一些参数和敏感性研究。这样的分析将以扩大对RC梁-柱-板连接内部抗荷载机制和极限能力的理解为目的。这项研究的结果也可能为未来能够模拟主导行为特征的简化模型的发展提供有价值的信息，同时保持简单性和计算效率。