Finite-element modelling of alkali−aggregate reaction in a concrete hydraulic structure

IF 1.3 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Proceedings of the Institution of Civil Engineers-Construction Materials Pub Date : 2022-03-03 DOI:10.1680/jcoma.21.00057
A. Nour, A. Cherfaoui
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引用次数: 1

Abstract

Nowadays, Alkali-Aggregate Reaction (AAR) in concrete causes serious concerns for the operation and the integrity of many mass and reinforced concrete structures, basically for hydraulic structures (dams, powerhouses, etc.) and any other concrete structure that is exposed to moisture. It is recognized that the kinetic of AAR is greatly driven by the temperature and the moisture amongst other parameters and the induced strain is assumed to be oriented according to the stress state. Due to complexity of AAR and its multi-physical nature, the use of chemomechanical modelling is very helpful for making predictions in terms of displacements and concrete damage. Moreover, the macro modelling approaches are frequently preferred to perform engineering work for real structures. In this context, this paper presents the implementation of a chemomechanical model of AAR for concrete in Abaqus Explicit. With this approach, AAR effects are introduced via the VUEXPAN user-subroutine jointly with the Concrete Damage Plasticity (CDP) model of Abaqus. The Abaqus explicit solver is chosen as it deals effectively with very large finite element models simulating highly nonlinear deformation due to AAR. The verification of the proposed model is performed at the material level. Moreover, it is presented a case study regarding real hydraulic structure affected by AAR located in North America.
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混凝土水工结构中碱-骨料反应的有限元模拟
如今,混凝土中的碱骨料反应(AAR)引起了许多大质量和钢筋混凝土结构的运行和完整性的严重关注,主要是水工结构(水坝,发电站等)和任何其他暴露于水分的混凝土结构。认识到AAR的动力学受温度和湿度等参数的影响很大,并假设感应应变根据应力状态定向。由于AAR的复杂性及其多物理性质,使用化学力学模型对位移和混凝土损伤的预测非常有帮助。此外,宏观建模方法往往更倾向于对实际结构进行工程工作。在此背景下,本文提出了在Abaqus Explicit中实现混凝土AAR的化学力学模型。利用该方法,通过VUEXPAN用户子程序结合Abaqus的混凝土损伤塑性(CDP)模型引入AAR效应。选择Abaqus显式求解器是因为它可以有效地处理模拟AAR引起的高度非线性变形的大型有限元模型。提出的模型的验证是在材料层面进行的。此外,还对位于北美的实际水工结构进行了AAR影响的实例分析。
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CiteScore
3.80
自引率
0.00%
发文量
23
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