PLASTIC-FRACTURE STRESS TRANSFER MODEL FOR CONCRETE DISCONTINUITIES

Citation
Zs. Wu et al., PLASTIC-FRACTURE STRESS TRANSFER MODEL FOR CONCRETE DISCONTINUITIES, ACI materials journal, 91(5), 1994, pp. 502-508
Citations number
8
Categorie Soggetti
Construcion & Building Technology","Material Science
Journal title
ISSN journal
0889325X
Volume
91
Issue
5
Year of publication
1994
Pages
502 - 508
Database
ISI
SICI code
0889-325X(1994)91:5<502:PSTMFC>2.0.ZU;2-A
Abstract
A physically based constitutive model for the behavior of concrete dis continuities is proposed. To consider a detailed mechanism that expres ses the microscopic features of concrete discontinuities, the crack su rface is idealized with both sawtooth and circular asperities. The saw tooth asperities represent the contact between mortar and mortar, whil e the circular asperities are used to simulate the phenomenon of aggre gate interlock (i.e., contact between aggregate and mortar). The behav ior of the two types of contact is investigated. To simulate all possi ble kinds of nonlinearities, two independent hyperbolic surfaces with a Mohr-Coulomb surface as an asymptotic surface for both the plastic p otential and yield function are defined in stress space. Basic materia l parameters such as cohesion, internal friction angle, dilatancy angl e, and tensile strength are varied according to the accumulated damage at the crack interface. Finally, several paths are considered to eval uate the capability of the proposed model. The model is amenable to im plementation in such numerical procedures as finite element computer p rogramming.