ABSTRACT

In Part I, a density driven damage mechanics (D3-M) approach and its application to model mechanical damage in concrete are presented. In this study, chemical and chemo-mechanical damage in concrete were modelled using the D3-M approach. It is proposed that reductions in local density in certain regions, created when concrete is subjected to chemical attack or coupled chemical-mechanical loading, result in reduced stiffness and strength of the material. The D3-M modelling approach stands out among the past efforts to predict the response of concrete to mechanical and chemical stimuli due to its ability to effectively model the mechanical, chemical, and coupled mechanical-chemical responses of concrete using a consistent framework and a single constitutive equation for both types of damage. Model simulations indicate that the response of the material to a scenario where chemical and mechanical loads are acting simultaneously cannot be considered equivalent to the response obtained by superposing the separate responses to independent mechanical and chemical loads.

摘要

在第一部分中，介绍了密度驱动损伤力学 (D3-M) 方法及其在混凝土机械损伤建模中的应用。在这项研究中，使用 D3-M 方法模拟混凝土中的化学和化学机械损伤。有人提出，当混凝土受到化学侵蚀或耦合的化学机械载荷时，某些区域的局部密度降低会导致材料的刚度和强度降低。D3-M 建模方法在过去预测混凝土对机械和化学刺激响应的努力中脱颖而出，因为它能够使用一致的框架和单一的框架有效地模拟混凝土的机械、化学和耦合的机械-化学响应。两种损伤的本构方程。