Modeling of Cohesive Crack Propagation in Lightweight Concrete UsingFinite Element Method

Please enable javascript in your browser.

Tavakoli, Saeed | 2015

526 Viewed

Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47248 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Khaloo, Alireza
Abstract:
In recent years, more attention has been paid to the development of lightweight concrete (LWC). Study of such this material had been marked due to more importance of use of it.It is now well known that in order to model cracks the finite element model is more suitable.The fracture of quasi-brittle material such as concreteincludesthe fracture process zone (FPZ).Cohesive zone model is considered the most common model used for FPZ modeling.Therefore, in this article the propagation of cohesive cracks inLWC is modeled using the extended finite element method (XFEM). In this study, modeling showed fastgrowth and propagation of cracks inLWC. Due to its cavities and pores, LWC shows to be more brittle than normal concrete with the same strength. By considering the small crack growth and increasing the integration points, cohesive crack propagation in LWC model resulted in a more accurateand qualitative analysis. Behaviorof concrete was observed using the crack length control method, with less error and no laboratory expenses. This study showed the properties of the extended finite element method in fracture modeling in a wide variety of materials
Keywords:
Light Concrete ; Modeling ; Fracture Mechanics ; Cohesive Crack ; Extended Finite Element Method

No TOC