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Seismic Performance of Strengthened Slab-Column Connections in a Full-Scale Test, Ramos, António Pinho, Isufi Brisid, Marreiros Rui, Coronelli Dario, Netti Teresa, Lamperti Tornaghi Marco, Tsionis Georgios, and Muttoni Aurelio , Journal of Earthquake Engineering, Volume 27, Number 9, p.2299 – 2318, (2023) AbstractWebsite
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Punching of flat slabs with in-plane forces, Ramos, Pinho A., Lúcio Válter J. G., and Regan Paul E. , Engineering Structures, Volume 33, Number 3, p.894–902, (2011) AbstractWebsite

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Estudo Experimental de Punçoamento em Lajes Fungiformes Pré Esforçadas, a Ramos, and Lúcio V. , Encontro Nacional Betão Estrutural 2004, Porto, (2004) Abstract

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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) Abstract

The 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.

Resistência ao Punçoamento de Lajes Fungiformes Pré-Esforçadas - Método Alternativo de Cálculo, Ramos, António, and Lúcio Válter , Revista Internacional Construlink, Volume 4, p.4–14, (2006) Abstract

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The effect of the vertical component of prestress forces on the punching strength of flat slabs, Ramos, Pinho A., Lúcio Válter J. G., and Faria Duarte M. V. , Engineering Structures, Volume 76, p.90–98, (2014) Abstract

The use of prestress in flat slabs is a common solution, mainly because it allows larger spans and thinner slabs. Nevertheless, smaller thicknesses near the slab-column connections, along with the superposition of high shear and flexural stresses, arise the question of the slab capacity to resist punching. The punching failure results from the superposition of shear and flexural stresses near the column, and is associated to the formation of a pyramidal plug of concrete which punches through the slab. It is a local and brittle failure. The use of prestress can increase the punching capacity of flat slabs-column connections.This work presents the experimental analysis of flat slab specimens with tendons under punching. Nine slabs were tested using unbonded prestress with high strength steel tendons. The influences on the punching capacity of the vertical component of the prestress forces resulting from inclined tendons near the column and their distance to the column are analysed. The in-plane compression force due to prestress was not applied to the slabs, in order to evaluate only the deviation force influence. This work aims to improve the understanding of the behaviour of prestressed flat slabs under punching load in order to properly evaluate the punching resistance of this kind of structures. The experimental punching loads are compared with the provisions of EC2, ACI 318-11 and MC2010. © 2014 Elsevier Ltd.

Rational use of HPFRC in slab – column connections under reversed horizontal cyclic loading, Ramos, António, Isufi Brisid, Marreiros Rui, Bolešová Mária, and Gajdošová Katarina , Engineering Structures, Volume 270, (2022) AbstractWebsite
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Punching of Flat Slabs under Reversed Horizontal Cyclic Loading, Ramos, António, Marreiros Rui, Almeida André, Isufi Brisid, and Inácio Micael , ACI Fall Convention 2016, Philadelphia, (2016) Abstract

Flat slab structures are a very common structural solution nowadays, due to their architectural and economic advantages. However, flat slab-column connections may be vulnerable to punching failure, especially in an event of an earthquake, with potentially high human and economic losses. This type of structural solution is adequately covered by design codes and recommendations in North America, due to a large amount of experimental research carried out. In Europe the situation is different, missing specific guidance to flat slab design under earthquake action in most European codes. The ACI 318-14 prescriptive approach to the gravity shear ratio-drift ratio relationship shows good agreement with experimental results. Following a similar approach and, based in a databank containing cyclic horizontally loaded tests of slab-column connections found in literature, proposals are made applicable to EC2 and MC2010.

Punching of prestressed flat slabs: Experimental analysis, Ramos, A. M. P., and Lúcio V. J. G. , International Workshop on Punching Shear Capacity of RC Flat Slabs, Volume 57, Stockholm, p.441–448, (2000) Abstract

The experimental analysis of nine prestressed flat slab models under punching is described and the results are compared with the recommendations of EC2 and MC90. The tests were performed on specimens at a scale 1/3, prestressed with unbonded high strength steel. In the first set, the specimens (AR2 to AR5 and AR7) were only subjected to in-plane compression, to evaluate the effect of the in-plane forces on the punching resistance. The second set of tests (AR8 to AR11) intended to study the effect of the vertical component of the tendon forces near the column in the punching resistance. This work aims to improve the understanding of the behaviour of prestressed flat slabs under punching load and the evaluation of the punching resistance.

Comportamento Pós-Rotura de Lajes Fungiformes Pré Esforçadas, Ramos, António Pinho, and Lúcio Válter , Revista Portuguesa de Engenharia de Estruturas, Volume 1, Number Série II, p.5–14, (2007) Abstract

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Análise Experimental de Técnicas de Reparação e Reforço ao Punçoamento, Ramos, A. M. P. e Lúcio, V. , 5º Encontro Nacional sobre Estruturas Pré-esforçadas, Porto, (1994) Abstract

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Reparação e Reforço de Lajes Fungiformes ao Punçoamento, Ramos, António , IST-UTL, Lisbon, (1995) Abstract

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Análise Numérica do Punçoamento em Lajes Fungiformes Pré-Esforçadas, e Nuno Mamede, Duarte Faria António Ramos , 5ªs Jornadas Portuguesas de Engenharia de Estruturas, Encontro Nacional de Betão Estrutural 2014, 9º Congresso Nacional de Sismologia e Engenharia Sísmica, Lisbon, (2014) Abstract

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A Minimization Prodecure for the Determination of SFRC Tensile Behaviour, Nuno Gouveia, Ana Luísa Custódio, Duarte Faria António Ramos , EngOpt 2014, 4th International Conference on Engineering Optimization, Lisbon, (2014) Abstract

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Deformation capacity evaluation for flat slab seismic design, Muttoni, A., Coronelli D., Lamperti Tornaghi M., Martinelli L., Pascu I. R., Pinho Ramos A., Tsionis G., Bamonte P., Isufi B., and Setiawan A. , Bulletin of Earthquake Engineering, Volume 20, Number 3, p.1619 – 1654, (2022) AbstractWebsite
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Punching of High Strength Concrete Flat Slabs - Experimental Investigation, Micael Inácio, António Ramos, Válter Lúcio, and Faria Duarte , fib symposium Tel Aviv 2013, Tel Aviv, p.377–380, (2013) Abstract

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Rational Use of High-Strength Concrete in Flat Slab- Column Connections under Seismic Loading, and Micael Inácio, Brisid Isufi, Massimo Lapi António Pinho Ramos , Volume 117, Issue 6, (2020) Abstract

High-strength concrete (HSC) slab-column connections with relatively low concrete strengths compared to today’s capabilities have been tested under seismic-type loading in the past. Herein, the hybrid use of HSC with compressive strength approximately 120 MPa and normal-strength concrete (NSC) is investigated through three reversed horizontal cyclic-loading tests with different geometries of the HSC region and a reference NSC specimen. The results show that HSC applied in the vicinity of the column can significantly enhance the seismic performance of slab-column connections. The best result in terms of drift capacity and economic use of HSC was achieved in the case of full-depth HSC extended from the column’s face up to 2.5 times the effective depth. Drift ratios up to 3.0% were achieved. A comparison with previous tests showed that the hybrid use of HSC and NSC can achieve similar results to the provision of punching shear reinforcement.

Punçoamento em Lajes Fungiformes de Betão de Elevada Resistência – Estudo Experimental, e Micael Inácio, Duarte Faria, Válter Lúcio António Ramos , 5ªs Jornadas Portuguesas de Engenharia de Estruturas, Encontro Nacional de Betão Estrutural 2014, 9º Congresso Nacional de Sismologia e Engenharia Sísmica, Lisbon, (2014) Abstract

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Análise do efeito de características mecânicas e geométricas que afetam o comportamento ao Punçoamento de lajes fungiformes, Mamede, Nuno, Ramos António, and Faria Duarte , Encontro Nacional Betão Estrutural 2012, Porto, p.1–8, (2012) Abstract

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Análise Numérica Não Linear do Punçoamento em Lajes Fungiformes – Calibração, Mamede, Nuno, Faria Duarte, and Ramos António , Revista Internacional Tech ITT, Volume 12, Issue 35, p.4-13, (2014)
Análise Numérica Não Linear do Punçoamento em Lajes Fungiformes – Estudo Paramétrico, Mamede, Nuno, Faria Duarte, and Ramos António , Revista Internacional Tech ITT, Volume 12, Issue 35, p.14-24, (2014)
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Estudo Experimental do Punçoamento Cíclico em Lajes Fungiformes Reforçadas com Pré-Esforço Transversal, Luis, Marta, and Ramos António , Encontro Nacional Betão Estrutural 2008, Guimarães, (2008) Abstract

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Reabilitação Estrutural de Edifícios com Pós-Tensão, Lúcio, Válter, Faria Duarte, Ramos António, and Ferreira João , ReHabend 2014, Santader, (2014) Abstract

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Reforço de Lajes Fungiformes com Betão Complementar Armado na Face Tracionada, Lúcio, Válter, Fernandes Hugo, and Ramos António , Construção Magazine, Volume 64, (2014)
Reforço de Lajes Fungiformes – Anomalias, Causas e Soluções, Lúcio, Válter, Ramos António, and Faria Duarte , SILE2008 – Seminário Internacional sobre Ligações Estruturais, Lisbon, p.1–10, (2008) Abstract

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