Characterization of the Inelastic Constitutive Behavior of Concrete Materials

混凝土材料非弹性本构行为的表征

• 批准号: 9313076
• 负责人: Wai-Fah Chen
• 金额: $ 26.6万
• 依托单位: Purdue Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-06-01 至 1998-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9313076&HistoricalAwards=false
• 关键词: Characterization; Inelastic; Constitutive; Behavior; Concrete

9313076 Chen Concrete materials exhibit both extremes of behavior: that is, ductile flow and brittle fracture. Under certain conditions, a transition between brittle and ductile behavior occurs, yet no distinction between the two modes has been made in any of the present failure criteria and related theories. Ideally constitutive equations should reflect both the modes of deformation and the possibility of a brittle-ductile transition. Also, because concrete materials are highly non-homogeneous, especially in the softening regime where cracking is widespread, macroscopic observations are not sufficient. Therefore, a unified elastic- plastic-damage theory is proposed, which is based on recent fundamental understanding of concrete micro-mechanics. New software development systems are thus necessary for adequate development and testing of new material models. A software development environment for structural engineering focused on software reusability.

9313076 Chen混凝土材料表现出两种极端的行为：即延性流动和脆性断裂。 在一定的条件下，脆性和韧性行为之间的转变发生，但没有区分这两种模式已在任何现有的破坏准则和相关理论。 理想的本构方程应反映变形模式和脆韧性转变的可能性。 此外，由于混凝土材料是高度不均匀的，特别是在软化区，裂纹是广泛的，宏观观察是不够的。 基于对混凝土细观力学的基本认识，提出了一个统一的弹塑性损伤理论。 因此，新的软件开发系统对于新材料模型的充分开发和测试是必要的。 结构工程的软件开发环境，侧重于软件的可重用性。