335 documents found, page 1 of 34
Effect of acidic environment on the bond behavior of TRM composites through sin...
Azimi, Nima; Oliveira, Daniel V.; Schollbach, Katrin; Lourenço, Paulo B.Textile Reinforced Mortars (TRM) for strengthening existing masonry structures are widely used these days as a sustainable solution. The system is comprised of textile fibers embedded in an inorganic matrix, typically cement or lime-based mortars, and is utilized over the surface of the substrate. Despite extensive research on the mechanical properties of these composite systems, there is still a lack of knowle...
Assessment of the thermal comfort of a masonry building - numerical study
Carneiro, Ana; Gonçalves, Pedro; Saraiva, Rafael; Oliveira, Daniel V.; Martins, Luís Barreiros; Teixeira, J. Carlos; Rodrigues, NelsonThe need to preserve masonry buildings in earthquake-prone areas leads to the analysis of their behavior when subjected to seismic actions. When studying different strengthening solutions, it is important to reassess the behavior of the building that has been reinforced regarding its initial resistance performance. In parallel, energy studies should be carried out to understand if the reinforcement solution bei...
Load capacity of T-REP elements: in-plane shear compression tests
Barsotti, Riccardo; Bennati, Stefano; Oliveira, Daniel V.Structural elements made of earth material and built accordingly to the “pisé” traditional building technique exhibit satisfactory mechanical responses when they are loaded by gravity forces; on the contrary, they appear to be comparatively weak when subjected to horizontal actions. The present contribution illustrates an experimental campaign recently performed jointly by the universities of Pisa and Minho on ...
Integrating experimental analysis and gradient boosting for the durability asse...
Taheri, Ali; Azimi, Nima; Oliveira, Daniel V.; Tinoco, Joaquim; Lourenço, Paulo B.This paper presents a comprehensive study of the mechanical properties of lime-based mortar in an acidic environment, employing both experimental analysis and machine learning to model techniques. Despite the extensive use of lime-based mortar in construction, particularly for the strengthening of structures as externally bonded materials, its behavior under acidic conditions remains poorly understood in the li...
Long-term behaviour of GFRP-reinforced masonry components under outdoor environ...
Ramirez Alvarez de Lara, Rafael; Ghiassi, Bahman; Oliveira, Daniel V.; Lourenço, Paulo B.Fiber-reinforced polymers (FRP) have found extensive application in the strengthening and repair of masonry since the 1990s. Despite significant research into the short-term performance of FRP-strengthened masonry, there is still a limited understanding of their long-term behaviour and durability. Therefore, it is still necessary to gain a deeper insight into the mechanisms causing degradation and durability ch...
Thermal properties of multi-purpose mortar mixtures: experimental characterizat...
Penazzato, Luca; Cosentino, Lívia; Turco, Chiara; Mateus, Ricardo; Oliveira, Daniel V.A considerable portion of existing buildings requires renovation. In Europe, there is a growing demand for integrated renovation strategies that reduce seismic vulnerability and improve energy efficiency. Retrofitting techniques, such as composite systems, use mortars with specific properties developed to fulfil a structural function. However, these mortars can also be used to improve the energy performance of ...
In-plane strenghtening of a rammed earth wall with a compatible TRM-strengtheni...
Romanazzi, Antonio; Silva, Rui André Martins; Barontini, Alberto; Mendes, Nuno; Oliveira, Daniel V.The significance of earthen architecture is associated to the local availability of the raw material, sustainability of the building process and low cost. Rammed earth is among the most disseminated building techniques integrating earthen buildings, whose cultural identity deserves to be preserved. Despite rammed earth buildings being widespread, the in-plane response of the walls is still not well known, namel...
The challenge of integrating seismic and energy retrofitting of buildings: an o...
Penazzato, Luca; Illampas, Rogiros; Oliveira, Daniel V.Recent earthquakes and escalating energy demands are exposing building stock deficiencies, particularly in terms of seismic resilience and energy efficiency. Many aged constructions do not fulfil current regulations both in terms of seismic and thermal design principles, thus requiring suitable retrofitting solutions. Integrated approaches for concurrent seismic and energy renovation have emerged as promising s...
Mechanical performance and microstructual investigation of binary and ternary l...
Penazzato, Luca; Illampas, Rogiros; Rigopoulos, Ioannis; Ioannou, Ioannis; Oliveira, Daniel V.The increasing demand for sustainable building products with lower carbon footprint is a huge global challenge that can hardly be faced by conventional cementitious mixtures. In this context, the use of alternative primary binders, such as hydraulic lime, should be explored. Research in this direction should aim at the development of innovative eco-friendly materials with suitable mechanical performance. For th...
Coated sisal/PET hybrid braided textiles interface behavior into cementitious m...
Kohan, Lais; Azimi, Nima; Aguiar Souza, Ivis; Fioroni, Carlos; Azevedo, Adriano G. S.; Freitas, Tais Oliveira Gonçalves; Peixoto, Joaquim Jorge GomesIntra-ply hybridization of two different braided yarns can enhance flexural and shear strength compared to conventional yarn properties. Hybrid braids offer the potential to reduce costs and boost industrial productivity. An impregnated textile with resin coating exhibits more cohesive behavior, ensuring stress distribution throughout the yarns and preventing a reduction in the composite’s ultimate tensile capa...