Mario Como

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Kansas State University

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University of Cagliari

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UNL - New University of Lisbon

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Università di Bologna

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Brown University

Iolanda Craifaleanu

Technical University Of Civil Engineering, Bucharest

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Universidad Nacional de Colombia (National University of Colombia)

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National & Kapodistrian University of Athens

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Hungarian Academy of Sciences

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Vanderbilt University

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Papers by Mario Como

Collapse State of Multi-Storey Masonry Walls Reinforced by Steel Ties Subjected to In-Plane Horizontal Loads

Key Engineering Materials, 2017

The determination of the seismic strength of masonry building is strictly connected to the in-pla... more The determination of the seismic strength of masonry building is strictly connected to the in-plane strength of masonry walls under the action of horizontal forces. Simplified criteria are currently available in literature, based on modelling of the structure as loaded by dead loads and by a gradually increasing distribution of horizontal forces, proportional to the mass of the building. According to this approach, called push-over method, the seismic strength of the building corresponds to the intensity of these gradually increasing horizontal loads, leading the building to the failure condition. This paper moves in the framework of the Limit Analysis, based on the Heyman’s masonry model (1966), rigid in compression with no tensile strength. The resistant model refers to a multi-storey wall with openings arranged in regular patterns, along both vertical and horizontal directions, reinforced at floor levels by steel ties. The in-plane failure of the regular multi-storey walls can oc...

The Slender Rigid Block: Archetype for the Seismic Analysis of Masonry Structures

Journal of Earthquake Engineering

Stability Analysis of Continuous Elastic Systems

Theory of Stability of Continuous Elastic Structures, 2022

An Introduction to Stability Analysis of Elastic Structural Systems

Theory of Stability of Continuous Elastic Structures, 2022

A Review of Some Functional Analysis Concepts

Theory of Stability of Continuous Elastic Structures, 2022

Bifurcation or Snapping at the Critical State of Continuous Elastic Structures

Theory of Stability of Continuous Elastic Structures, 2022

Cantilevered Stairways

Springer Series in Solid and Structural Mechanics, 2017

The Collapse of the Beauvais Cathedral in 1284: The Conjecture of the Creep Buckling Piers

The paper analyzes the failure occurred at the cathedral of Beauvais in the past 1284. The interi... more The paper analyzes the failure occurred at the cathedral of Beauvais in the past 1284. The interior vaulting exceeded 48 m in height, making it the tallest cathedral in Europe. The collapse was quite inexplicable and many theories have been debated trying to understand the reasons of the failure. This paper contributes to the discussion and investigates whether the creep buckling of the masonry piers could be considered re- sponsible of the collapse. In this analysis the masonry has no tensile strength and the creep of the mortars is properly taken into account. The study shows that the slenderness of the masonry piers, together with the eccentricities of the axial loads and the mortar's creep effects, can be considered the real causes of the failure.

Modellazione delle pareti multipiano in muratura per la costruzione delle relative curve di pushover

Aim of the paper is to give a contribution to the seismic vulnerability evaluation of masonry str... more Aim of the paper is to give a contribution to the seismic vulnerability evaluation of masonry structures with a more rational approach. First of all, the paper points out that the behaviour of these structures is non-linear elastic, with a peculiar lacking of energy dissipation. This remark springs out by examining the behaviour of the masonry panel under the action of alternant horizontal force in the framework of the usual assumption, for the masonry, of the no tension material. Masonry structures, in any case, exhibit a geometric ductility. Consequently, new response spectra are built to obtain the required connection between strength and ductility. These results are applied to formulate a new procedure for the seismic strength evaluation, with displacement control, of multi-plane masonry walls with openings.

Plastic Analysis of Masonry Arches Reinforced with FRCM under Vertical and Horizontal Forces

Key Engineering Materials, 2019

Aim of this paper is the evaluation of the increasing of the load-carrying capacity of masonry ar... more Aim of this paper is the evaluation of the increasing of the load-carrying capacity of masonry arches strengthened at intrados extrados with poliparafenilenbenzobisoxazole (PBO) fabric reinforced cementitious mortar composite. An analytical procedure is proposed, in the Limit Analysis context, considering two schemes of load: a vertical load applied at the crown of the arch and a horizontal distribution proportional to the weight. The presence of the composite material is introduced by considering a plastic behaviour of the hinges defining the virtual kinematic mechanism compatible with the Limit Analysis hypotheses. Two assumptions on these mechanisms are made: a correct position of the hinges inside the cross-section of the masonry arch or a simplified location at the intrados or at the extrados of the structure. Finally, a parametric survey is carried out in order to understand the influence of the involved parameters on the load-carrying capacity of the strengthened masonry arches.

Influenza della deformabilità sulla risposta dinamica di elementi in muratura sollecitati fuori dal piano

Barrel Vaults

Springer Series in Solid and Structural Mechanics, 2017

Reinforcement analysis in the restoration of masonry monuments

Equilibrium Stability of Continuous Elastic Structures

Theory of Stability of Continuous Elastic Structures, 2022

Buckling of Continuous Elastic Structures

Theory of Stability of Continuous Elastic Structures, 2022

Masonry Vaults: Domes

Springer Series in Solid and Structural Mechanics, 2016

Beautiful domes have been built firstly by Mycenaeans and later by Romans and Byzantines; domes w... more Beautiful domes have been built firstly by Mycenaeans and later by Romans and Byzantines; domes were practically neglected in the Middle Ages, later rediscovered by the Renaissance and Baroque architecture. Following the approach outlined in the previous section, this chapter firstly deals with the analysis of membrane stresses occurring in rotational shells that describe, with sufficient accuracy, the initial un-cracked stress state of the masonry dome. Later, the masonry dome probably cracks when the tension stresses in the hoop rings near the springing will reach the masonry's weak tensile strength, usually fading in the course of time. The initial membrane equilibrium is thereby lost and meridian cracks will arise and spread along the dome. The emergence of thrust is the main consequence of cracking of the hemispherical domes. The occurrence of this thrust yields a subsequent deformation of the supporting structures and the dome, as a rule, activates its minimum thrust state. The research of the dome thrust is the main subject of the chapter and it will be searched both by static and kinematic approaches: in this last case as maximum thrust among all the kinematical ones. In addition to the hemispherical dome with constant thickness, four outstanding examples of actual masonry domes are then analyzed in detail: the ancient Mycenaean tholoi, the Pantheon, the dome of St. Maria del Fiore in Florence and the St. Peter dome in Vatican.

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Effetti P-D sulla resistenza alle azioni sismiche di strutture in c.a

Oggetto del lavoro e lo studio della resistenza sismica di strutture in c.a. tenendo conto dell’e... more Oggetto del lavoro e lo studio della resistenza sismica di strutture in c.a. tenendo conto dell’effetto P-D. Le strutture analizzate sono i telai a maglie regolari, gli elementi portanti degli edifici civili, e le pile da ponte diversamente vincolate alla testa e al piede. Infine, i risultati ottenuti sono stati confrontati con alcuni dei modelli presenti in letteratura.

The Colosseum

Springer Series in Solid and Structural Mechanics, 2017

Masonry Buildings Under Seismic Actions

This last chapter deals with the study of the seismic behaviour of historic masonry buildings. St... more This last chapter deals with the study of the seismic behaviour of historic masonry buildings. Starting point of the chapter is the remark that traditional masonry buildings have not been built to offer any resistance to horizontal actions. This is why most of the seismic damage occurs in old historic centres, as well as why there is currently such a great demand to determine the most suitable means to reinforce them. The first sections of the chapter are focused to point out that, contrariwise to steel or reinforced concrete structures, that can oppose the seismic action by using their ductility, masonry constructions don’t dissipate energy during their deformation, even if accompanied by cracks. If properly reinforced, to avoid early local failures, masonry constructions have the sole resource to escape the seismic action exhibiting rocking without failure, under alternate seismic action. A constant acceleration impulse, of a suitable duration, can represent the seismic action. A ...

Dynamic Response of Rocking Masonry Circular Arches

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015), 2019

The behaviour of masonry constructions against seismic actions, very far from the one characteriz... more The behaviour of masonry constructions against seismic actions, very far from the one characterizing ductile structures, is based on the activation of a rocking motion rather than a dissipating mechanism. A strength resource of masonry structures consists in exhibiting rocking behaviour, until a failure condition is attained. The paper deals with the topic of the seismic assessment of masonry circular arches, one of the typical resistant systems of unreinforced masonry structures, whose vulnerability has been highlighted by damages and collapses occurred with recent seismic events. The paper aims to investigate the dynamic behaviour of masonry circular arches, according to the studies performed by Housner and Oppenheim. A single-degree-of freedom analytical model is proposed to study their dynamic behaviour, representing the structure as an assembly of rigid bodies, connected through hinges with each other and subjected to a horizontal ground acceleration. Starting from the evaluation of the incipient rocking acceleration of the system, the free and forced motions of the arch are examined. An ad hoc energy dissipation model is specifically implemented for the studied case, according to the classical Housner's approach. Finally, a numerical application, considering a simple constant horizontal acceleration impulse of given duration has been carried out.

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Collapse State of Multi-Storey Masonry Walls Reinforced by Steel Ties Subjected to In-Plane Horizontal Loads

Key Engineering Materials, 2017

The Slender Rigid Block: Archetype for the Seismic Analysis of Masonry Structures

Journal of Earthquake Engineering

Stability Analysis of Continuous Elastic Systems

Theory of Stability of Continuous Elastic Structures, 2022

An Introduction to Stability Analysis of Elastic Structural Systems

Theory of Stability of Continuous Elastic Structures, 2022

A Review of Some Functional Analysis Concepts

Theory of Stability of Continuous Elastic Structures, 2022

Bifurcation or Snapping at the Critical State of Continuous Elastic Structures

Theory of Stability of Continuous Elastic Structures, 2022

Cantilevered Stairways

Springer Series in Solid and Structural Mechanics, 2017

The Collapse of the Beauvais Cathedral in 1284: The Conjecture of the Creep Buckling Piers

Modellazione delle pareti multipiano in muratura per la costruzione delle relative curve di pushover

Plastic Analysis of Masonry Arches Reinforced with FRCM under Vertical and Horizontal Forces

Key Engineering Materials, 2019

Influenza della deformabilità sulla risposta dinamica di elementi in muratura sollecitati fuori dal piano

Barrel Vaults

Springer Series in Solid and Structural Mechanics, 2017

Reinforcement analysis in the restoration of masonry monuments

Equilibrium Stability of Continuous Elastic Structures

Theory of Stability of Continuous Elastic Structures, 2022

Buckling of Continuous Elastic Structures

Theory of Stability of Continuous Elastic Structures, 2022

Masonry Vaults: Domes

Springer Series in Solid and Structural Mechanics, 2016

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Effetti P-D sulla resistenza alle azioni sismiche di strutture in c.a

The Colosseum

Springer Series in Solid and Structural Mechanics, 2017

Masonry Buildings Under Seismic Actions

Dynamic Response of Rocking Masonry Circular Arches

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015), 2019

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