Papers by Antonino Maria Marra
Bayesian FE-Model Updating of a Curved Approaching Span of the Indiano Bridge in Florence
Lecture notes in civil engineering, 2024
Super long span bridges: wind-resistant design developments and open issues
Proceedings of the Institution of Civil Engineers, Nov 26, 2023
Proposal for determination of wind action on steel rack supported warehouses during execution
ce/papers
The exponential growth of e‐commerce in the last decade boosts the need of large logistic centers... more The exponential growth of e‐commerce in the last decade boosts the need of large logistic centers. Steel rack supported warehouses (SRSWs) are one of the most competitive solutions for such infrastructures. The execution phase of SRSWs is challenging, as the stability of the structure has to be ensured throughout the different erection stages. The wind action is here particular important. The density of structural elements and the incompleteness of the SRSWs structure, is a vulnerable condition under wind loads. The determination of wind forces during execution according to the EN 1991‐1‐4 is very limited when dealing with open frame structures, and in particular, with structural systems such as SRSWs. In order to overcome this lack, the wind action on SRSWs during execution has been subject of a recent concluded RFCS research project “STEELWAR”. This paper presents the proposal of a method to determine the wind forces on SRSWs under construction. The method is derived from a series...
Direct numerical identification of aeroelastic parameters at lock-in
Multi-Hazard and Multi-vulnerability Analysis in Historical Urban Areas: Challenges and Opportunities
Advances in science, technology & innovation, 2023
Innovative and Eco-Compatible Materials for the Regeneration of the Historical Buildings Located in the Med Area
CEES 2021 - International Conference on Construction, Energy, Environment and Sustainability, 2021
VIV and galloping interaction for a 3:2 rectangular cylinder
Numerical Investigation on the Use of Flat-Jack Test for Detecting Masonry Deformability
Journal of Testing and Evaluation, 2020
Correct determination of masonry deformability is fundamental for evaluating the seismic response... more Correct determination of masonry deformability is fundamental for evaluating the seismic response of masonry structures. For existing buildings, double flat-jack tests are largely used to estimate elastic modulus, but many problems arise for a reliable interpretation of the test outcomes. Formulas provided by standards or available in the literature follow different approaches, the results of which are strongly variable. Furthermore, these formulas do not take into consideration important practical aspects of the test apparatus, like the position of the measurement reference points in the masonry sample. The arrangement of the gauge points can influence the displacement measurements and, consequently, the value of elastic modulus. This work aims at numerically investigating—through finite element (FE) models—the effects of the position of the gauge points on the outcomes of a double flat-jack test. In particular, a continuous FE mode is adopted, in which the concrete damage plasticity model implemented in Abaqus code is used to model the nonlinear behavior of the masonry. This study provides recommendations on the correct way to determine reliable values of elastic modulus from double flat-jack testing. Furthermore, numerical results and their comparison with experimental data allow for important considerations with regard to both the research field and professional and practical activities.
Natural Hazards, 2022
Natural hazards pose a significant threat to historical cities which have an authentic and univer... more Natural hazards pose a significant threat to historical cities which have an authentic and universal value for mankind. This study aims at codifying a multi-risk workflow for seismic and flood hazards, for site-scale applications in historical cities, which provides the Average Annual Loss for buildings within a coherent multi-exposure and multi-vulnerability framework. The proposed methodology includes a multi-risk correlation and joint probability analysis to identify the role of urban development in re-shaping risk components in historical contexts. The workflow is unified by exposure modelling which adopts the same assumptions and parameters. Seismic vulnerability is modelled through an empirical approach by assigning to each building a vulnerability value depending on the European Macroseismic Scale (EMS-98) and modifiers available in literature. Flood vulnerability is modelled by means of stage-damage curves developed for the study area and validated against ex-post damage cla...
A New Compatible and Sustainable FRLM Composite for the Seismic and Energetic Upgrade of Historic Buildings
Lecture notes in networks and systems, 2022
Influence of the masonry wall thickness on the outcomes of double flat-jack test: Experimental and numerical investigation
Construction and Building Materials
Abstract The formulas provided by the standards or available in the literature for the calculatio... more Abstract The formulas provided by the standards or available in the literature for the calculation of the elastic modulus don’t consider many variables that influence the results of flat jack tests such as, first of all, the influence of the wall thickness. In this paper, flat-jack tests were performed - in the laboratory - on masonry wall specimens having the same geometrical and mechanical properties but different thickness. Then, a numerical assessment by FEM was carried out in order to extend the experimental evidences to the case of masonry walls with large thickness. This study allows to more accurately predict the masonry elastic modulus by double flat-jack test and it provides important data useful for the research activity as well as for the engineering practice.
Experimental investigation on the VIV-galloping instability of a 3:2 rectangular cylinder
XXI Congresso dell'Associazione Italiana di Meccanica Teorica e Applicata (AIMETA), 2013
ABSTRACT The interaction between galloping and vortex-induced vibration was experimentally invest... more ABSTRACT The interaction between galloping and vortex-induced vibration was experimentally investigated for an infinitely long rectangular cylinder with a side ratio of 3:2, free to vibrate in the transverse mode in smooth flow. This geometry showed strong proclivity to instability and large oscillations occurred also at high Scruton numbers, in a range of flow speeds where no excitation was expected according to the classical theory. A high value of the ratio of the quasi-steady galloping critical wind speed to Kármán-vortex resonance velocity is necessary to avoid such a combined instability. Measurements of transverse displacements, velocity fluctuations in the wake of the oscillating body and pressures on its surface highlighted nonlinear features of the fluid-structure coupled system, such as superharmonic resonances and hysteresis. In particular, for low values of the Scruton number, non-negligible excitation was observed at low reduced wind speed due to secondary resonance.
Comportamento aeroelastico di un cilindro rettangolare 3:2
XII Convegno Nazionale di Ingegneria del Vento (IN-VENTO 2012), 2012
This paper represents a first step towards a prenormative study on the Strouhal number of bridge ... more This paper represents a first step towards a prenormative study on the Strouhal number of bridge decks. The main goal of the work is to identify, where possible, a range of values of this important parameter for the most common typologies of deck cross sections to be used for the preliminary design of bridge structures. With this aim in mind, data available in the literature are critically reviewed, collected and classified.
Natural thermal plasters for fibre-composite matrices. Structural-energy-environmental analysis
The article presents the first results of MIRACLE research, aimed at designing, testing, and impl... more The article presents the first results of MIRACLE research, aimed at designing, testing, and implementing innovative reinforcement systems with bio-composite matrix, with additives containing natural thermal-plasters, usable in the restoration of residential buildings created before 1945. Starting from a brief description of the properties of fibre-reinforced cement organic matrices, supported by a survey of international research aimed at developing innovative methodologies, systems, and components used to improve the energy and mechanical performances of listed historic buildings, the most suitable thermal-plasters will be analysed (among those existing on the Italian market), identifying the performance characteristics both in terms of mechanic and thermal and environmental sustainability.
Journal of Wind Engineering and Industrial Aerodynamics, 2017
The aerodynamics of a stationary two-dimensional cylinder with rectangular 5:1 cross section is t... more The aerodynamics of a stationary two-dimensional cylinder with rectangular 5:1 cross section is the object of an international experimental and numerical benchmark study (BARC). The unsteady flow past such a bluff body is governed by the impinging shear-layer instability mechanism, which is also responsible for potential flowinduced vibrations. This paper discusses the characteristics of the high-Reynolds-number unsteady flow over the cylinder, investigated in the wind tunnel through pressure and force measurements on a sectional model in smooth and turbulent flows. In addition, hot-wire anemometry measurements of the velocity in the wake of the cylinder were carried out in smooth flow. The study is particularly focused on understanding the influence of free-stream turbulence and angle of attack on the aerodynamic behavior of the body. Key features are highlighted, such as a slight Reynolds-number dependence of force coefficients and Strouhal number in smooth flow, or the turbulence-induced variation of the length of the separation bubbles along the lateral sides of the cylinder. Incoming turbulence is also found to affect the vortex-shedding mechanism of impinging shear-layer instability, promoting the switch from a dominant mode to another. Finally, the wake measurements described some vortex-shedding features, confirming a slight Reynolds-number dependence of the Strouhal frequency.
Vortex-induced vibrations of a yawed bridge tower
14th International Conference on Wind Engineering (ICWE14), 2015
The interaction between galloping and vortex-induced vibration was experimentally investigated in... more The interaction between galloping and vortex-induced vibration was experimentally investigated in the particular case of an infinitely long rectangular cylinder with a side ratio of 1.5 in smooth flow. This geometry was found to be very unstable and large oscillations were observed also at high Scruton number in a range where no excitation was expected according to the classical theory. A ratio of the quasi-steady galloping critical wind speed to Kármán-vortex resonance velocity larger than a minimum value in the range 7 ÷ 9 seems to be necessary in order to avoid such a combined instability. This result, which finds a support from the literature, is in strong disagreement with Eurocode 1, which unconservatively claims that interaction can be excluded for a ratio of critical velocities outside the range 0.7÷1.5. The effect of Reynolds number was also partially investigated by testing two section models at different scales. Finally, the experiments highlighted several nonlinear featu...
Aeroelastic instabilities of rectangular cylinders with various side ratios
A few two-dimensional prisms with rectangular cross section were tested in the wind tunnel. The m... more A few two-dimensional prisms with rectangular cross section were tested in the wind tunnel. The models were free to vibrate in the plunging mode only and the smooth flow was perpendicular to a face of the cylinders. These clean and simple geometries are of great importance in bluff-body aerodynamics and in the wind engineering practice, showing a pronounced proclivity to several aeroelastic instabilities ranging from vortex-induced vibration to galloping, that in some cases can strongly interact. This paper presents also the results of analytical models which were applied to some particular test cases. The comparison with the experimental data underscored the complexity of the aeroelastic response of these structures.
Role of correlation between mechanical parameters in the probabilistic seismic vulnerability of historical masonry towers
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Papers by Antonino Maria Marra