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混凝土材料表现出极端的行为：即延性流动和脆性断裂。 在某些条件下，发生脆性和延性行为之间的过渡，但是在目前的任何失败标准和相关理论中，两种模式之间均未区分。 理想情况下，本构方程应既应反映变形模式，也应反映脆性脱尿过渡的可能性。 同样，由于混凝土材料是高度非均匀的，尤其是在裂纹普遍存在的软化方案中，因此宏观观察不够。 因此，提出了一种统一的弹性损伤理论，该理论基于对混凝土微力学的最新理解。 因此，新的软件开发系统对于对新材料模型的充分开发和测试是必需的。 结构工程的软件开发环境集中在软件可重复使用上。