Escola Superior de Tecnologia e Gestão
URI permanente desta comunidade:
Navegar
Percorrer Escola Superior de Tecnologia e Gestão por autor "Abdelhak, Kada"
A mostrar 1 - 3 de 3
Resultados por página
Opções de ordenação
- Behavior of cellular beams protected with intumescent coatingsPublication . Lamri, Brahim; Mesquita, L.M.R.; Abdelhak, Kada; Piloto, P.A.G.A new engineering practice in modern buildings is to use beams with web openings to allow the passage of services within the depth of the beam instead of underneath the beam. As the web post failure may occur before the section reaches the limiting temperature, usually an increase in the fire protection may be required for members with web openings in comparison to its equivalent solid section. The aim of this work is to present an experimental study of unloaded solid and cellular beams with circular holes in fire conditions with and without intumescent fire protection. These preliminary tests results are the basis for generating an elemental multi-temperature analysis needed to assess cellular beams with intumescent protection and give experimental results for calibration of further numerical simulations. The experimental results show that, considering the same nominal fire protection thickness, one can obtain a higher fire resistance time for solid beams when compared with cellular beams. The tests performed, with different hole diameters and web-post widths, points that to achieve the same fire resistance time, a cellular beam will need a higher fire protection compared to an equivalent solid beam. Also, a special care is needed when the intumescent coating is applied around the hole to avoid the intumescent contraction, applying for example an over coating.
- Fire after earthquake assessment of 3D reinforced concrete structuresPublication . Haouach, Ismail; Abdelhak, Kada; Lamri, Belkacem; Piloto, Paulo A.G.Despite that, an earthquake’s occurrence can lead to dramatic effects with significant damage in urban areas, including human and material losses. Fire after an earthquake amplifies the overall impact and becomes a catastrophic event. Most constructions in Algeria are made of reinforced concrete, and current regulations overlook fires after earthquakes. Structural designs are inadequate to handle such events. This study aims to investigate the behaviour of 3D reinforced concrete frames, as part of a residential building, designed accordin to internal codes, CBA93 and RPA99 v2003. This 3D RC structure is exposed to several load levels of its vertical load bearing capacity. The structural system is assumed to undergo seismic scenarios characterised by various levels of story drift and damage level types. The structure is then exposed to the standard fire ISO834 model. Numerical investigations are carried out for thermo-mechanical analysis using the finite element software ANSYS, taking into account geometric and material non-linearities. Results highlight the significant impact of vertical loads, story drifts, fire scenarios, and structural damage on a building’s response to fire following an earthquake. These factors collectively influence the collapse probabilities, underlining the importance of holistic risk assessment in structural design.
- Simulation numerique du comportement non-lineaire des portiques métalliques en situation d’incendiePublication . Benlakehal, Nourredine O.; Lamri, Belkacem; Abdelhak, Kada; Bouchair, Abdelhamid; Mesquita, L.M.R.Pour des raisons pratiques d’exploitation et de durabilité, les bâtiments industriels, sont dans la majorité des cas conçu en charpente métallique. Cependant le matériau acier quoi que ductile, il reste vulnérable aux excès de températures. Les récents événements d’incendies concernant les structures et bâtiments industriels de Sonatrach, à Alger dans une zone urbaine ou à Skikda dans une zone industrielle, nous rappellent le danger réel et le risque potentiel des incendies. Les nouvelles normes Européennes définissent des exigences actives et passives concernant le comportement au feu des bâtiments industriels. L’objectif de ce travail concerne l’étude du comportement non-linéaire des structures industrielles en acier selon plusieurs scénarios de feu. L’analyse numérique par la MEF et utilisant le logiciel ANSYS est considérée afin d’évaluer la résistance de ces structures et d’optimiser leur protection au feu. Une analyse, utilisant les non linéarités géométrique et matérielle, est conduite avec une variation progressive des températures jusqu’à la ruine. Différents taux de chargement ainsi que différents scénarios de feu seront utilisés pour évaluer la température critique ainsi que les déplacements des portiques en fonction de l’évolution de la température.