Ιδρυματικό Αποθετήριο
Πολυτεχνείο Κρήτης
Πολυτεχνείο Κρήτης
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| URI | http://purl.tuc.gr/dl/dias/000B2796-38BB-46F3-8E32-7B1B39B5FB1B | - |
| Γλώσσα | en | - |
| Μέγεθος | 10 pages | en |
| Τίτλος | Parametric finite element analysis of masonry structures using different constitutive models | en |
| Δημιουργός | Stavroulaki Maria | en |
| Δημιουργός | Σταυρουλακη Μαρια | el |
| Δημιουργός | Liarakos Evaggelos | en |
| Δημιουργός | Λιαρακος Ευαγγελος | el |
| Περίληψη | The masonry of old structures varies in a wide range: geometry of walls and columns, type and dressing of stones, joint constructions and materials, and others. Also repair work and strengthening techniques of old masonry have a major influence on the mechanical behavior so additionally material models are needed to describe the seismic behavior of strengthened masonry. The masonry material constituting the structures of monumental and old constructions is often characterized by very low tensile strength with respect to the compression strength. In parallel, masonry compression behaviour is of crucial importance for design and safety assessment purposes, since masonry structures are primarily stressed in compression. However, the compression failure mechanism of quasi-brittle materials is rather complex, especially when compared with tensile failure. The finite element method is usually adopted to achieve sophisticated simulations of the structural behaviour. A mathematical description of the material behaviour, which yields the relation between the stress and strain tensor in a material point of the body, is necessary for this purpose. This constitutive model must be capable of predicting the behaviour of the structure from the linear elastic stage, through cracking and degradation until total loss of strength. Masonry is a composite material made of bricks and mortar, which exhibits distinct directional properties due to the mortar joints which act as planes of weakness. In our research, on the numerical representation the macromodeling of masonry as a composite is used, which is applicable when the structure is composed of solid walls with sufficiently large dimensions so that the stresses across or along a macro-length will be essentially uniform and also is more practice oriented. Nonlinear behaviour of both components should be considered to obtain a realistic model able to describe cracking, slip, and crushing of the material. Its yield behaviour is a strong function of hydrostatic pressure and tensile yield stress and compressive yield stress, under uniaxial loading are different. In order to obtain a better representation, individual yield criteria must be considered, according to different failure mechanisms, one in tension and the other in compression. Something which is not so easy in many yield and failure criteria which are already programmed to finite elements programs. In this paper, some results of a parametric investigation about the applicability of widely used criteria like the Drucker and Prager, the Parabolic Mohr- Coulomb and the Buyukozturk, in the dynamic analysis of masonry wall are presented. The analysis was done, considering various dynamic loads in order to study the influence of the selected criterion on the dynamic behaviour locally or globally of the structure. The correlation of the results is concentrated on the effectiveness of the examined criteria to represent the real mechanical behavior and the estimation of critical areas. Also the differences which are presented seems to be remarkable when complicated dynamic loads are applied. | en |
| Τύπος | Πλήρης Δημοσίευση σε Συνέδριο | el |
| Τύπος | Conference Full Paper | en |
| Άδεια Χρήσης | http://creativecommons.org/licenses/by/4.0/ | en |
| Ημερομηνία | 2015-10-14 | - |
| Ημερομηνία Δημοσίευσης | 2008 | - |
| Θεματική Κατηγορία | Applied mechanics | en |
| Θεματική Κατηγορία | Engineering, Mechanical | en |
| Θεματική Κατηγορία | mechanics applied | en |
| Θεματική Κατηγορία | applied mechanics | en |
| Θεματική Κατηγορία | engineering mechanical | en |
| Βιβλιογραφική Αναφορά | M. E. Stavroulaki,E. V. Liarakos ,"Parametric finite element analysis of masonry structures using different constitutive models ,"in 6th GRACM International Congress on Computational Mechanics,2008. | en |
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