Deterministic size effect in concrete structures with account for chemo-mechanical loading

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• 作者：S. Moallemi^a ; S. Pietruszczak^a ; ^{pietrusz@mcmaster.ca} ; Z. Mró ; z^b
• 关键词：Size effect ; Alkali-silica reaction ; 3D crack propagation ; Embedded discontinuity model ; Bifurcation analysis
• 刊名：Computers & Structures
• 出版年：2017
• 出版时间：1 April 2017
• 年：2017
• 卷：182
• 期：Complete
• 页码：74-86
• 全文大小：2754 K
• 卷排序：182

文摘

A framework for modeling of deterministic size effect in concrete structures is outlined. Chemo-mechanical interaction and the post failure response (crack formation) are taken into account. The mathematical formulation of the constitutive equations governing both the homogeneous and localized deformation is provided. The first set of simulations deals with a deterministic assessment of the size effect in a series of three-point bending tests as well as compression tests. For continuing ASR, it is shown that, by increasing the size of the structure, a spontaneous failure may occur under a sustained load. It is clearly demonstrated that the size effect is associated with propagation of localized damage whose rate is controlled by a suitably defined ‘characteristic length’.