288 documents found, page 1 of 29
Short- and long-term deflections of RC slabs strengthened with CFRP systems und...
Dushimimana, Aloys; Pereira, João Miguel; Correia, Luís Luciano Gouveia; Sena-Cruz, JoséThis study investigates the combined effects of sustained loading and environmental conditioning on the short-and long-term mid-span deflection behavior of reinforced concrete (RC) slabs strengthened using different CFRP-based techniques: (i) Externally Bonded Reinforcement (EBR), (ii) Near-Surface Mounted (NSM), (iii) EBR with prestressing via mechanical anchorage (EBR-MA), and (iv) EBR with prestressing via g...
Overview and aspects of the european technical specification CEN/TS 19101:2022,...
Correia, João R.; Ascione, Luigi; Keller, Thomas; Mottram, Toby; Sena-Cruz, José; Paulotto, Carlo; Knippers, Jan; Pacheco, JoãoIn November 2022, the European Committee for Standardization (CEN) published the Technical Specification CEN/TS 19101:2022, “Design of Fibre-Polymer Composite Structures.” These design provisions, which follow the philosophy and partial factor format of the Eurocodes, are a milestone toward the widespread application of composite materials in civil engineering structures. This paper presents an overview and hig...
Environmental boundary conditions for prediction of temperature distribution in...
Filho, Marco Antonio Santiago Abreu; Pereira, João Miguel; Azenha, Miguel; Sena-Cruz, JoséUnderstanding and accurately predicting the thermal behaviour of fibre-reinforced polymer (FRP) composites is critical for their reliable application in structural systems. This study focuses on predicting temperature distributions within hybrid FRP sandwich panels composed of a pultruded glass fibre-reinforced polymer (GFRP) box, a closed-cell polyurethane foam core, and a steel fibre-reinforced self-compactin...
An interpretable machine learning-based model for shear resistance prediction o...
Mohammadi, Amir Hossein; Barros, Joaquim A. O.; Sena-Cruz, JoséExisting analytical models for predicting the shear resistance of RC beams strengthened with externally bonded CFRP reinforcements exhibit deficient performance due to their inability to accurately capture the complex resisting mechanisms. Combined with significant statistical uncertainties in shear failure, driven by its brittle nature, this further undermines the reliability of these models. To address these ...
Multi-objective optimization of unbiased model for externally bonded CFRP syste...
Mohammadi, Amir Hossein; Barros, Joaquim A. O.; Sena-Cruz, JoséPredicting the shear resistance of reinforced concrete (RC) beams strengthened with externally bonded reinforcement (EBR) using carbon fiber-reinforced polymer (CFRP) materials poses a significant challenge due to the complex nonlinear relationship with beam features and the inherent randomness in shear failure events, driven by their brittle nature. This paper proposes a model employing a multi-objective optim...
Durability of bond between EBR-CFRP laminate and concrete after four years of n...
Dushimimana, Aloys; Sena-Cruz, José; Correia, Luís Luciano Gouveia; Pereira, João Miguel; Cabral-Fonseca, Susana; Cruz, RicardoApplication of carbon fibre reinforced polymer (CFRP) composites in strengthening of existing reinforced concrete (RC) structures has been widely accepted. However, the durability of adhesively bonded CFRP-concrete joint has not yet been fully investigated, which therefore paves the way to the topic addressed in this work: the durability of the joint in concrete elements strengthened with CFRP laminate using ex...
Modelling of short- and long-term bond behavior in concrete structures strength...
Dushimimana, Aloys; Sena-Cruz, José; Vassilopoulos, Anastasios P.; Correia, Luís Luciano Gouveia; Pereira, João MiguelIn the context of structural rehabilitation of concrete structures, carbon fiber reinforced polymer (CFRP) composites are usually bonded to concrete substrates using the externally bonded reinforcement (EBR) technique. Although this is a commonly used method in various applications, only a few studies have investigated the long-term performance of such joints. In this study, numerical models to simulate the sho...
Acoustic behaviour of GFRP-PUR web-core composite sandwich panels
Proença, Miguel; Santos, Pedro; Godinho, Luís; Neves e Sousa, Albano; Correia, João R.; Garrido, Mário; Sena-Cruz, JoséThis paper presents an experimental and analytical study about the sound insulation of innovative sandwich panels - named EasyFloor – _for the rehabilitation of degraded timber floors in old buildings. Two types of panels were developed: (i) an all-composite sandwich panel, made of glass fibre reinforced polymer (GFRP) face sheets and webs, and polyurethane (PUR) foam; (ii) and a hybrid sandwich panel, where th...
Development of a foam-filled steel web sandwich panel for the rehabilitation of...
Gontijo, Guilherme Lopes; Filho, Marco Antonio Santiago Abreu; Benzo, Pier Giovanni; Pereira, João Miguel; Machado, José; Denchev, Z.; Sena-Cruz, JoséLightweight sandwich panels offer a prominent solution for the rehabilitation of timber floors. This paper addresses the development of a solution capable of continuous production for a foam-filled steel web sandwich panel for floor rehabilitation. The newly designed flooring solution is tested in full-scale quasi-static flexural campaigns. The tests validate the analytical design’s compliance with Ultimate lim...
Behavior of CFRP composites and epoxy adhesives after long-term exposure to out...
Dushimimana, Aloys; Vassilopoulos, Anastasios P.; Sena-Cruz, José; Pereira, João Miguel; Correia, Luís Luciano Gouveia; Cabral-Fonseca, SusanaCarbon fiber reinforced polymer (CFRP) composites have shown desirable properties in aerospace, automotive, and construction industries. Focusing on the latter and in the context of strengthening existing structures, CFRP composites are typically bonded to concrete structures using epoxy adhesive as a bonding agent. To date, there is a lack of literature on the durability of both the CFRP composite and epoxy ad...