A review of tests on slab-column connections with advanced concrete materials,
Isufi, Brisid, and Ramos António Pinho
, Structures, Volume 32, p.849-860, (2021)
AbstractAdvances in concrete technology during the last decades have resulted in the development of materials with enhanced mechanical properties, such as High Strength Concrete (HSC), Fibre Reinforced Concrete (FRC) and Ultra-High Performance Fibre Reinforced Concrete (UHPFRC). The application of these materials in flat slabs, which are a popular structural solution in Reinforced Concrete (RC) buildings worldwide, has the potential of significantly reducing raw material consumption by enabling the design of slenderer and therefore lighter structures. However, flat slabs are susceptible to punching shear failure, which is a complex phenomenon that remains challenging, even though significant efforts have been made to experimentally study it. For advanced concrete materials (HSC, FRC and UHPFRC), the challenge is further accentuated by the continuous and rapid development of these materials. With the purpose of identifying and highlighting gaps in the published literature, a review of tests with HSC, FRC and UHPFRC slab-column connections in non-seismic and seismic loading applications is presented in this paper. It is shown that future research directions in this field include, among others, testing thicker slabs, HSC slabs with higher concrete compressive strength, HSC combined with FRC and several more cases related to seismic loading conditions.
A review of punching behavior of slab–column connections with recycled coarse aggregate concrete,
Ramos, António, Marchão Carla, Pacheco João Nuno, Enfedaque Alejandro, Coronelli Dario, Faria Duarte, de Brito Jorge, Ruiz Miguel Fernández, and Marreiros Rui
, Structural Concrete, (2024)
Abstractn/a
Reversed horizontal cyclic loading tests of flat slab specimens with studs as shear reinforcement,
Isufi, Brisid, Ramos António Pinho, and Lúcio Válter
, Structural Concrete, (2018)
AbstractThe results of a series of experiments on four reinforced concrete flat slab specimens with shear studs and a control specimen without any shear reinforcement are presented. The specimens were tested under constant gravity loads and reversed horizontal cyclic displacements. The main test variables were the applied gravity load and the number of perimeters of studs. One of the specimens was tested in two phases to study the postearthquake behavior. Results showed a considerable improvement of the deformation capacity of specimens with studs compared to the reference specimen. In agreement with previous research, increasing the applied gravity shear ratio resulted in a lower experimental drift capacity. It is shown that a better explanation of the observed ultimate drifts can be made by considering also the flexural capacity and the extent of shear reinforcement. The specimen tested in two phases exhibited considerable residual capacity, even after severe horizontal loading.
Reversed horizontal cyclic loading tests of flat slab specimens with studs as shear reinforcement,
Isufi, Brisid, Ramos António Pinho, and Lúcio Válter
, Structural Concrete, Volume 20, Number 1, p.330-347, (2019)
AbstractThe results of a series of experiments on four reinforced concrete flat slab specimens with shear studs and a control specimen without any shear reinforcement are presented. The specimens were tested under constant gravity loads and reversed horizontal cyclic displacements. The main test variables were the applied gravity load and the number of perimeters of studs. One of the specimens was tested in two phases to study the postearthquake behavior. Results showed a considerable improvement of the deformation capacity of specimens with studs compared to the reference specimen. In agreement with previous research, increasing the applied gravity shear ratio resulted in a lower experimental drift capacity. It is shown that a better explanation of the observed ultimate drifts can be made by considering also the flexural capacity and the extent of shear reinforcement. The specimen tested in two phases exhibited considerable residual capacity, even after severe horizontal loading.
Resposta da ligação pilar-laje fungiforme sujeitas a ações horizontais cíclicas reforçadas com estribos,
Almeida, André, Ramos António, Marreiros Rui, Lúcio Válter, and Faria Ricardo
, Encontro Nacional Betão Estrutural 2018, 7-9 Nov., LNEC, Lisboa, (2018)
Resposta da ligação pilar-laje fungiforme sujeitas a ações horizontais cíclicas reforçadas com estribos,
Almeida, André, Ramos António, Marreiros Rui, Lúcio Válter, and Faria Ricardo
, Revista Portuguesa de Engenharia de Estruturas, Volume Série III, Issue 9, p.67-74, (2019)
Repair and Strengthening Methods of Flat Slabs for Punching,
Ramos, Antonio, Lucio Valter, and Regan Paul E.
, International Workshop on Punching Shear Capacity of RC Flat Slabs, Stockholm, p.125–133, (2000)
AbstractThe present work reports experimental research carried out on repair and strengthening methods of flat slabs for punching. The repair and strengthening methods studied are: strengthening using transversal prestress, repair by substitution of the damaged concrete; and strengthening using steel beams as a column head, connected to the column and to the slab with epoxy resin and mechanical expansion anchors. Four experimental test slabs (AR1 to AR4) were produced and tested: two with transversal prestress, one only repaired and one strengthened with a steel column head. The execution process, its efficiency and design, are discussed.
Rehabilitation of Historical Masonry Bridges,
Rodrigues, Neuza, Ramos António, and Branco Fernando
, 1st International Conference Construction Heritage in Coastal and Marine Environments – Damage, Diagnostic, Maintenance and Rehabilitation, Lisbon, p.1–10, (2008)
Abstract