Characterization of the Inelastic Constitutive Behavior of Concrete Materials

混凝土材料表现出两种极端的性能，即韧性流动和脆性断裂。在一定条件下，脆性和延性行为之间会发生过渡，但在现有的任何破坏准则和相关理论中都没有对这两种模式进行区分。理想情况下，本构方程应同时反映变形模式和脆-韧过渡的可能性。此外，由于混凝土材料高度不均匀，特别是在开裂普遍的软化状态下，宏观观察是不够的。因此，在对混凝土细观力学基本认识的基础上，提出了一种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。一个结构工程的软件开发环境，关注软件的可重用性。

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.