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Miguel Fernández Ruiz

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Publications associées (249)

Size effect on punching shear strength: differences and analogies with shear in one-way slabs

Aurelio Muttoni, Miguel Fernández Ruiz

Size effect has been theoretically and experimentally acknowledged as a phenomenon influencing the shear and punching shear strength of concrete structures, with reducing unitary shear strength for increasing member sizes. For members failing in shear, as ...

2016

Approaches for suitable modelling and strength prediction of reinforced concrete slabs

Aurelio Muttoni, Miguel Fernández Ruiz, Raffaele Cantone, Beatrice Belletti

Despite the advances on the understanding and modelling of shear and punching shear failures, the application of actual design models to some stations remains still complex. In addition, other significant phenomena such as compressive membrane action and m ...

fib, Fédération Internationale du Béton, Lausanne2016

Analysis of shear transfer actions in reinforced concrete members using refined measurement techniques

Aurelio Muttoni, Miguel Fernández Ruiz, Francesco Cavagnis

Detailed investigations on the role of the shear transfer actions in members without transverse reinforcement have traditionally been limited due to the possibilities offered by conventional measurement techniques. The main difficulty of such conventional ...

fib, Fédération International du Béton, Lausanne2016

The Critical Shear Crack Theory for punching design: from a mechanical model to closed-form design expressions

Aurelio Muttoni, Miguel Fernández Ruiz

The Critical Shear Crack Theory (CSCT) is a consistent approach used for shear design of one- and two-way slabs failing in shear and punching shear respectively. The theory is based on a mechanical model allowing to determine the amount of shear force that ...

2016

Strength of reinforced concrete footings without transverse reinforcement according to limit analysis

Aurelio Muttoni, Miguel Fernández Ruiz, Duarte Miguel Viúla Faria, João Tiago Ramos Bernardo de Santa Rita Simões

Isolated footings are reinforced concrete elements whose flexural and punching shear strengths are usually governing for their design. In this work, both failure modes and their interaction are investigated by means of the kinematical theorem of limit anal ...

Engineering structures2016

Bond behaviour of straight, hooked, U-shaped and headed bars in cracked concrete

Aurelio Muttoni, Miguel Fernández Ruiz, Fabio Brantschen, Duarte Miguel Viúla Faria

Most classic investigations on bonding properties in reinforced concrete have been performed on the basis of pull-out tests, where a reinforcement bar is pulled out from an uncracked concrete cylinder, prism or cube. In these tests, the bond is governed by ...

Thomas Telford2016

Fire Design of Concrete Structures based on a Levels-of-Approximation Approach

Miguel Fernández Ruiz, Miguel Gomez

Concrete structures, contrary to steel or timber structures, have not been traditionally considered as significantly sensitive to fire conditions. As a consequence, their performance in fire conditions has generally been assessed on the basis of quite simp ...

fib Symposium 20152015

Shear strength of concrete members without transverse reinforcement: A mechanical approach to consistently account for size and strain effects

Aurelio Muttoni, Miguel Fernández Ruiz, Juan Sagaseta Albajar

Many theories and empirical formulae have been proposed to estimate the shear strength of reinforced concrete members without transverse reinforcement. It can be noted that these approaches differ not only in the resulting design expressions, but also on t ...

2015

Influence of moment redistribution and compressive membrane action on punching strength of flat slabs

Aurelio Muttoni, Miguel Fernández Ruiz, Jürgen Einpaul

The punching shear strength of interior column connections of flat slabs has traditionally been investigated with isolated test specimens subjected exclusively to hogging bending moments. However, the behavior of such specimens is different from that of ac ...

Engineering structures2015

Experimental investigation on fatigue of concrete cantilever bridge deck slabs subjected to concentrated loads

Aurelio Muttoni, Miguel Fernández Ruiz, Francisco Manuel Maciel Natário

Shear has been observed to be often the governing failure mode of RC cantilever deck slabs of bridges without shear reinforcement subjected to concentrated loads when tested under a quasi-static application of the load. However, concentrated loads of heavy ...

Engineering structures2015

Design versus Assessment of Concrete Structures Using Stress Fields and Strut-and-Tie Models

Aurelio Muttoni, Miguel Fernández Ruiz, Filip Niketic

Stress fields and strut-and-tie models are widely used for design and assessment of structural concrete members. Although they are often used in the same manner for both purposes, developing suitable stress fields and strut-and-tie models for the design of ...

2015

Influence of Fatigue Loading in Shear Failures of Reinforced Concrete Members without Transverse Reinforcement

Aurelio Muttoni, Miguel Fernández Ruiz, Francisco Manuel Maciel Natário, Juan Manuel Gallego Martín

Shear fatigue of reinforced concrete members without transverse reinforcement has been observed to be potentially governing for the strength of some structural members subjected to large live loads of repetitive nature (as traffic, wind or wave actions). A ...

Journal of Advanced Concrete Technology2015

Analogy between Sustained Loading and Strain Rate Effects on the Nonlinear Creep Response of Concrete

Aurelio Muttoni, Miguel Fernández Ruiz, Darko Tasevski

This paper investigates the uniaxial compression behaviour of concrete under different strain rates and its relation to sustained loading. The aim is to observe the strain rate effect on the pre- and post-peak behaviour of concrete. In particular, the deve ...

10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures2015

Limit Analysis for Punching Shear Design of Compact Slabs and Footings

Aurelio Muttoni, Miguel Fernández Ruiz, Duarte Miguel Viúla Faria, João Tiago Ramos Bernardo de Santa Rita Simões

In this paper, the kinematical theorem of limit analysis is used to obtain the governing failure mechanisms and the corresponding failure load of reinforced concrete footings without transverse reinforcement. To that purpose, a Mohr-Coulomb yield criterion ...

fib Symposium2015

Shear failures in reinforced concrete members without transverse reinforcement: An analysis of the critical shear crack development on the basis of test results

Aurelio Muttoni, Miguel Fernández Ruiz, Francesco Cavagnis

Shear in concrete members without transverse reinforcement can be carried by various potential sheartransfer actions, whose activation depends much on the actual cracking pattern and kinematics at failure. Failures can occur in a progressive manner (at the ...

Engineering structures2015

Shear-Fatigue Behaviour of RC Cantilever Bridge Deck Slabs under Concentrated Loads

Aurelio Muttoni, Miguel Fernández Ruiz, Francisco Manuel Maciel Natário

Shear has been observed to be the governing failure mode of RC cantilever deck slabs of bridges without shear reinforcement when subjected to concentrated loads of heavy vehicles. This observation has been verified experimentally for a quasi-static applica ...

fib Congress2015

Shear strength of RC slabs under concentrated loads near clamped linear supports

Aurelio Muttoni, Miguel Fernández Ruiz, Francisco Manuel Maciel Natário

Reinforced concrete slabs without shear reinforcement subjected to concentrated loads near linear sup- ports are usually designed or assessed in shear using design provisions that have been calibrated on the basis of tests on one-way slabs or beams with re ...

Engineering structures2014

Stress Fields for the analysis of the faillure load and cracking state of dapped-end beams (Aplicación de modelos de campos de tensiones para el análisis en servicio y rotura de apoyos a media madera)

Aurelio Muttoni, Miguel Fernández Ruiz, Jaime Mata Falcon

The automatic generation of elastic-plastic stress fields (EPSF) for structural concrete members by means of the finite element method has been demonstrated as a suitable approach for the design and assessment of D regions. This methodology allows accounti ...

VI Congreso ACHE2014

How simple can nonlinear finite element modelling be for structural concrete?

Aurelio Muttoni, Miguel Fernández Ruiz, Galina Argirova

This paper discusses on the required level of simplicity for suitable modelling of structural concrete. Traditional equilibrium-based approaches (as strut-and-tie models) are too coarse in some cases, as they account for the cracking state of concrete in a ...

Inst Ciencias Construccion Eduardo Torroja2014

Influence of prestressing on the punching strength of post-tensioned slabs

Aurelio Muttoni, Miguel Fernández Ruiz, Thibault Clément, António Manuel Pinho Ramos

Previous researches on punching of post-tensioned slabs have shown a number of phenomena significantly influencing their strength and behaviour. However, no general agreement is yet found on a physical theory (either in codes of practice or in design model ...

Elsevier Sci Ltd2014

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