Tesis doctoral de álvaro Viviescas Jaime
The study of the mechanical-resistant behavior of blocky masonry as construction material, used in a variety of historical and current buildings, has been a relatively recent area of interest. this, considering the vastness of the scientific work conducted for other construction materials like concrete. in order to contribute in this area of knowledge, a research was developed and it is presented in this thesis. It has been oriented towards the search of simple methods that allow in practical way, to estimate the maximum load that can be supported by masonry walls subjected to the combined action of compressive vertical and horizontal shear loads. the first phase of this research was dedicated to the collection and analysis of the state of the art related to the study of the mechanical-resistant behavior of masonry walls, in either experimental or analytical level. This literature review was continued throughout the whole process of the research. In subsequent stages, results of selected experimental campaigns on masonry walls were used to calibrate and/or validate the performed numerical studies. subsequently, a numeric micro-model was selected to be used as a tool to verify and/or adjust the initial proposals of simple models. These simple models are based on the struts and ties method which uses the struts to represent the compressive stress fields and the ties for tension zones, both of them forming a resistant mechanism. The objective was to predict satisfactorily, by means of the numeric micro-model, the ultimate loads and mechanisms of fracture observed in the experimental campaigns on masonry walls reported in the literature. the available data from experimental campaigns, helped to validate the numerical micro- models that were used in the two cases of vertical load studied, uniform and partial or concentrated loads. Then a parametric study was conducted in order to determine the influence of several variables and geometrical properties on the structural behavior of masonry walls. The results of this study allowed us to evaluate the ability of simple models to represent the influence of the analyzed factors on the response of the wall. in the case of uniform vertical load was evident, in general, that simple models presented a satisfactory performance in predicting the ultimate response of the evaluated walls. The case of partial or concentrated vertical load required the modification of the original simple models proposals in order to include other factors that influence the response of the wall according to the numerical results. This modification was done by contrasting different stress distributions stresses obtained numerically with the proposed resistant mechanism of the simple models. the final result of this research consists on the proposal of a simplified method for the analysis of simple walls in masonry under biaxial states (compressive and shear) of solicitations on its plane. finally, the conclusions drawn from the current research are summarized and recommendations for future works are given.
Datos académicos de la tesis doctoral «Modelos simples para el analisis de muros de obra de fabrica cargados en su plano«
- Título de la tesis: Modelos simples para el analisis de muros de obra de fabrica cargados en su plano
- Autor: álvaro Viviescas Jaime
- Universidad: Politécnica de catalunya
- Fecha de lectura de la tesis: 24/07/2009
Dirección y tribunal
- Director de la tesis
- Pere Roca Fabregat
- Tribunal
- Presidente del tribunal: José Luis Gonzalez moreno navarro
- cristina Vazquez herreo (vocal)
- ricardo alfredo Cruz hernández (vocal)
- Luis Villegas cabredo (vocal)