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You searched for +publisher:"Universidade do Minho" +contributor:("Ghiassi, Bahman"). Showing records 1 – 2 of 2 total matches.

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Universidade do Minho

1. Mininno, Gemma. Modelling of the behaviour of TRM-strengthened masonry walls .

Degree: 2016, Universidade do Minho

The un-reinforced masonry structures (URM) represent an important percentage of the building heritage, but they have poor performance in seismic condition. Hence the construction industry has been extremely interested in their repair and rehabilitation. In the last decades, the innovative materials made of continuous fibres embedded in organic matrices (FRP) have been largely adopted to enhance the seismic performance of the constructions. Initially, these materials were designed to be applied to concrete structures, and only later they were adopted also in masonry structures. Although the advantages introduced by these composite products were undeniable, some drawbacks were also observed, mainly related to the organic matrices (e.g. epoxy). As a consequence, a new type of composite materials, where the organic substrate is substituted with an inorganic matrix (e.g. cementitious or lime-based mortar), were proposed as a solution. These materials on one hand kept the positive aspects of the FRPs (improvement of the shear-resistance and the deformability without increasing the weight of the structure) and on the other hand overcame their disadvantages (poor behaviour in condition of high temperatures or fire, vulnerability to the external agents, low permeability, low compatibility with the masonry substrate). Consequently, mortar-based composites resulted to be mechanically and physically more compatible with masonry substrates and able to satisfy issues related to conservation principles as reversibility and sustainability. The innovative composite materials made of continuous fibres embedded in thin mortar layers for externally bonded reinforcement of masonry structures, typically referred to as FRCM (Fibre Reinforced Cementitious mortar) or TRM (Textile Reinforced Mortar), have recently received attention from researchers. Despite the recent interest on the use of these materials, the available information regarding their performance when applied to structures or structural components is still scare. For instance, the effectiveness of TRM systems on the seismic performance of strengthened structures is not clear yet. Given the aforementioned research context, the present thesis has the aim to investigate the effectiveness of the implementation of TRM composite materials on the in-plane and out-of-plane response of a masonry wall. Therefore, different finite element models to study the in-plane and out-of-plane performance have been created. A comparison of their behaviour in unreinforced and reinforced conditions is carried out by means of non-linear analyses, under the effect of a lateral-monotonic load proportional to the mass (pushover) first and then under the effect of a real accelerogram recorded during the L'Aquiia earthquake, occurred the 6 t of April 2009. The results are presented and discussed critically. Advisors/Committee Members: Oliveira, Daniel V (advisor), Ghiassi, Bahman (advisor).

Subjects/Keywords: Masonry; MM; FRCM; Strengthening; FEM modelling; In-plane behaviour; Out-of-plane behaviour; Time history analysis; Alvenaria; TRM; Modelação FEM; Comportamento no plano; Comportamento para fora do plano; Análise temporal; Muratura; Rinforzo; Modellazione FEM; Comportamento nel piano; Comportamento fuori dal piano; Analisi time history

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Mininno, G. (2016). Modelling of the behaviour of TRM-strengthened masonry walls . (Masters Thesis). Universidade do Minho. Retrieved from http://hdl.handle.net/1822/42869

Chicago Manual of Style (16th Edition):

Mininno, Gemma. “Modelling of the behaviour of TRM-strengthened masonry walls .” 2016. Masters Thesis, Universidade do Minho. Accessed May 30, 2020. http://hdl.handle.net/1822/42869.

MLA Handbook (7th Edition):

Mininno, Gemma. “Modelling of the behaviour of TRM-strengthened masonry walls .” 2016. Web. 30 May 2020.

Vancouver:

Mininno G. Modelling of the behaviour of TRM-strengthened masonry walls . [Internet] [Masters thesis]. Universidade do Minho; 2016. [cited 2020 May 30]. Available from: http://hdl.handle.net/1822/42869.

Council of Science Editors:

Mininno G. Modelling of the behaviour of TRM-strengthened masonry walls . [Masters Thesis]. Universidade do Minho; 2016. Available from: http://hdl.handle.net/1822/42869


Universidade do Minho

2. Cascardi, Alessio. Analytical model for shear capacity of masonry retrofitted with fiber reinforced mortar layer .

Degree: 2014, Universidade do Minho

Structural consolidation has always been a challenge for anyone who has had to deal with and has been addressed with different approaches, more or less invasive. Alongside the traditional techniques, the application of composite materials to masonry buildings is now promising for consolidation, improvement and / or seismic adjustment. Such materials, endowed with excellent tensile strength, allow to easily put a remedy to situations that affect both the elevation and horizontal structures and, respect the interventions with traditional materials, reduced invasiveness, as they allow maintain almost unchanged the dimensions. Composite materials have been found effective in a wide series of applications and seem to be viable substitutes for the conventional materials used in intervention techniques. A large number of existing unreinforced masonry (URM) structures are made by stone blocks and poor mortars, showing a low strength against in-plane seismic forces. The shear behaviour of masonry walls subjected to in-plane lateral forces is strongly dependent on the quality of the mortar used in the joints and on the strength of the blocks. In heritage buildings, where masonry was made by using weak materials, it is not unusual to find collapse due to sliding forces acting along the loaded diagonals of the walls, following the joints directions. Innovative consolidation techniques show efficacy in testing so the importance of guarantee analytical formula for the design of the application becomes a challenge for researchers and the development would be useful for engineers. Notice that it will only applied to existing undamaged masonry that needs strengthening. A large test campaign on masonry panels retrofitted with fibers reinforced mortar layer was conducted by the University of Salento in cooperation with the laboratory group of University of Trento. Scope of the experiment was to verify shear capacity improvement due to the application of fibers grid in a cement mortar matrix on the masonry walls. Diagonal compressive tests were made on reinforced and un-reinforced masonry. Panels were properly prepared with very poor quality mortar joints in order to simulate existing masonry structures typically present on the Salento landscape. Given the great importance of historic structures and the need to protect the existing buildings, the present work aims to present an innovative analytical model for the prediction of the masonry shear capacity retrofitted with glass or carbon fibres grids immersed in a mortar matrix. The model is implemented using a data mining technique which is able to determine relationship between parameters observed in the experimental campaign. It is reasonable to consider the resultant model as a starting point of a large study which takes into account a new set of test designed based on the formula provided by the data mining procedure. It can, in fact, confirm the importance of the analysed parameters and it will help to plan the new test in the most useful way. Advisors/Committee Members: Oliveira, Daniel V (advisor), Ghiassi, Bahman (advisor).

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Cascardi, A. (2014). Analytical model for shear capacity of masonry retrofitted with fiber reinforced mortar layer . (Masters Thesis). Universidade do Minho. Retrieved from http://hdl.handle.net/1822/30614

Chicago Manual of Style (16th Edition):

Cascardi, Alessio. “Analytical model for shear capacity of masonry retrofitted with fiber reinforced mortar layer .” 2014. Masters Thesis, Universidade do Minho. Accessed May 30, 2020. http://hdl.handle.net/1822/30614.

MLA Handbook (7th Edition):

Cascardi, Alessio. “Analytical model for shear capacity of masonry retrofitted with fiber reinforced mortar layer .” 2014. Web. 30 May 2020.

Vancouver:

Cascardi A. Analytical model for shear capacity of masonry retrofitted with fiber reinforced mortar layer . [Internet] [Masters thesis]. Universidade do Minho; 2014. [cited 2020 May 30]. Available from: http://hdl.handle.net/1822/30614.

Council of Science Editors:

Cascardi A. Analytical model for shear capacity of masonry retrofitted with fiber reinforced mortar layer . [Masters Thesis]. Universidade do Minho; 2014. Available from: http://hdl.handle.net/1822/30614

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