Raffaele Landolfo

Raffaele Landolfo
University of Naples Federico II | UNINA · Department of Structures for Engineering and Architecture

Full Professor

About

437
Publications
115,618
Reads
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6,473
Citations
Citations since 2016
220 Research Items
5209 Citations
20162017201820192020202120220200400600800
20162017201820192020202120220200400600800
20162017201820192020202120220200400600800
20162017201820192020202120220200400600800
Additional affiliations
January 2013 - present
University of Naples Federico II
Position
  • Head of Department
November 1998 - November 2003
Università degli Studi G. d'Annunzio Chieti e Pescara
Position
  • Professor (Associate) 1998-2000, Professor (Full) 2000-2003

Publications

Publications (437)
Article
This paper summarizes the results of experimental tests and finite element simulations aimed at investigating the buckling response of cold-formed square and rectangular hollow columns. The material stress–strain curves of the tested columns have been derived from testing 83 coupons sampled from the flat and corner parts of the cross-sections, alon...
Article
Square and rectangular cold‐formed hollow sections are generally produced by either direct forming or indirect forming. These methods allow manufacturing nominally similar geometries of the cross‐sections, but leading to some different mechanical characteristics. The present paper addresses cold‐formed structural hollow sections produced by indirec...
Article
Full-text available
Given the current climate emergency and the ambitious targets of carbon emissions reduction, retrofitting strategies on existing buildings typically include reducing energy demand, decarbonising the power supply, and addressing embodied carbon stored in materials. This latter point redefines the role of engineers in the transitions towards a sustai...
Article
FREEDAM connections consist of a symmetric friction device connecting the lower flange of the beam to the column by means of L-Stubs. This assembly prevents the damage of the connected members and dissipates energy by means of the slippage between the clamped steel elements and the friction pads of the device. In order to characterize the monotonic...
Article
Full-text available
Steel moment resisting frames (MRFs) are drift‐sensitive structures and their design is largely influenced by code requirements to limit the lateral displacements and to control the second order effects. Current and next generation of Eurocode 8 recommend different rules to verify the lateral rigidity and resistance of steel MRFs that lead to struc...
Article
Full-text available
Industrial single-storey buildings are the most diffuse typology of steel construction located in Italy. Most of these existing buildings were erected prior to the enforcement of adequate seismic provisions; hence, crucial attention is paid nowadays to the design of low-impact retrofit interventions which can restore a proper structural performance...
Article
EQUALJOINTS and EQUALJOINTS-Plus are two European projects (research and dissemination respectively) funded by the European Research fund for Coal and Steel (RFCS) and coordinated by the Author. The main aim of these projects was to develop seismic prequalification procedures, currently missing in EN1998–1:2005, for the beam-to-columns joints that...
Article
Cold formed Hollow Structural Sections (HSS) are widely used in structural applications, especially in multi-storey buildings located in seismic areas because of their high strength-to-weight ratio and torsional stiffness. However, current version of European seismic code provides limited rules and guidance to evaluate the ductility as well as the...
Article
Full-text available
Fatigue performance is often a key aspect when dealing with existing steel structures such as steel bridges or offshore constructions. This issue proves to be more critical as these structures are usually located in aggressive environments and are thus exposed to progressive degradation. Indeed, disruptive phenomena such as corrosion can severely w...
Article
Full-text available
The research aims to illustrate a vulnerability approach extended for the aggregate masonry buildings belonging to an urban area of the city of Latronico (Basilicata Region). The area was examined taking into account the predominant building typology according to the investigation line WP2 "Inventory of existing structural typology" of the Italian...
Article
The current edition of Eurocode 8 (EN 1998 (CEN (2004))) does not explicitly cover the earthquake-resistant design of the Lightweight steel (LWS) buildings made with cold-formed steel (CFS) frame. Extensive research has been carried out in the past decade on this topic that provides a solid background for an update of the current provisions and the...
Article
High strength steel (HSS) wire ropes are widely used in civil engineering to act as hangers or bridge cables. These kinds of structural members are particularly prone to both corrosion and fatigue damage owing to typical exposition and load conditions. Within this framework, in the present paper a comprehensive state of the art review dealing with...
Article
The non-linear monotonic and hysteretic behaviour of as-built and retrofitted beam-to-column joints of an existing non-code conforming steel multi-storey building was investigated by means of finite element simulations. The building case study was originally designed to resist only gravity and wind loads without any capacity design principle. The a...
Article
Nominated for Eurosteel 2021 Best Paper Award The introduction to the market of metal foams represents a significant opportunity to increase the use of metal in the construction market. In fact, the development of new products made of metal foams and steel could improve the performance of conventional buildings in terms of stiffness and resistance....
Chapter
It is nowadays acknowledged that the minimum intervention principle shall guide any structural interventions on Cultural Heritage buildings. The enhancement of the structural capacity shall not result in a weakening of the values and the authenticity of the monument. Hence, the design of an efficient structural intervention has to be based on a cor...
Chapter
The paper focuses on a review of Augmented Reality/Mixed Reality (AR/MR) technologies in the perspective of the application to SHM Structural Health Monitoring for Submerged Floating Tunnels (SFT). In particular Microsoft HoloLens devices (MHD) are precious tools for survey purposes, since they allow the superimposition of information about the sur...
Chapter
Nowadays, the development of rapid and low-impact structural rehabilitation strategies and techniques is very topical. These prerogatives are essential for the seismic retrofit of industrial buildings, for which the seismic retrofit solution should be selected also accounting for the impact of the interventions on the productive activities. Therefo...
Chapter
Since the ‘80s the use of steel external additive structures is considered one of the most suitable techniques for seismic retrofit of existing RC structures with low dissipative capacity. This structural typology, called exoskeleton, made its first appearance in 2000s in the Japanese and American codes dealing with structural rehabilitation issues...
Chapter
The EC8 design rules and requirements for steel moment-resisting frames (MRFs) mainly address far-field seismic scenarios. However, there are specific issues to account for Near Fault (NF) strong motions that may increase inelastic demand on structural steel members and joints. The latter are usually designed or qualified for far-field earthquakes....
Chapter
The Italian earthquakes of the last 15 years highlighted the significant seismic vulnerability of industrial buildings, which represent structural typologies at high risk due to their noteworthy exposure. The paper concerns a parametric study on a class of Italian existing industrial steel buildings designed before 1980 without anti-seismic criteri...
Chapter
The present work is focused on seismic assessment and retrofit of the beam-to-column joints of an existing non-conforming steel building. Refined finite element analyses were performed to investigate the performance of the existing beam-to-column joints under monotonic and cyclic loading conditions as well as the effectiveness of different strength...
Chapter
This study aims at evaluating the capacity of steel moment frame (MRF) structures at collapse limit state designed according to the current version and next release of Eurocode 8. To this purpose, the framework of performance-based earthquake engineering according to PEER is adopted. The collapse intensity and subsequently the mean annual rate of c...
Article
Full-text available
In this paper, the response of the rigid block under rectangular pulse excitation is investigated using two different modeling approaches and solvers. The first approach relies on the numerical integration of the differential equation of motion. The second approach is based on the formulation of the dynamic problem in terms of a special class of ma...
Article
Lightweight steel (LWS) buildings, made of cold-formed steel (CFS) systems, have many advantages and are often employed in seismic areas as low- and medium rise buildings. However, in Europe the codification does not provide specific rules for seismic design of those structures. In light of this, the University of Naples “Federico II” has recently...
Article
Mechanical properties of materials, as provided by current design standards, are the pre-requisites for the proper identification and structural assessment of existing buildings and civil engineering works. For mechanical characterisation, in case of “Limited Knowledge” (KL1) without direct information on the material properties, the usual features...
Article
Most of existing steel multi-storey frames in Europe have been designed before the introduction of modern seismic design provisions, hence they often exhibit low performance under earthquake loads due to their low lateral resistance and energy dissipation capacity. In addition, such structures often include rigid and brittle masonry infill walls th...
Article
Nowadays it is known that the European building stock is energy-intensive and insecure: constructions need interventions both to solve performance and structural deficiencies and to reduce the current unsustainable energy waste. An intelligent retrofit for existing structures should offer an intervention integrating all the different performance re...
Article
A R T I C L E I N F O Keywords: CEN EN 1998 Cold-formed steel Effective strip method Eurocode 8 Lightweight steel Overstrength Seismic design rules Shear walls SSheet sheathing A B S T R A C T The current structural European codes for seismic design EN1998-1 do not provide design criteria for cold formed steel (CFS) shear walls with steel sheet she...
Article
The introduction in the market of metal foams represents a significant opportunity to increase the use of metal in the construction market. In fact, the development of new products made of metal foams and steel could allow improving the performances of conventional buildings in terms of stiffness and resistance. The first structural applications of...
Conference Paper
Existing steel moment-resisting frames in several seismic regions worldwide are often characterised by high vulnerability to earthquakes due to insufficient local and/or global ductility. Nowadays, it is of paramount importance to assess their response under strong motions and provide cost-effective retrofitting strategies. Amongst others, the seis...
Conference Paper
Full-text available
It is now widely recognised that masonry infill plays an essential role in the seismic behaviour of existing steel buildings; however, there is still a lack of clear guidance on the modelling of masonry infill in the current Eurocode 8-Part 3. Several methods for the numerical modelling of masonry infills have been proposed in literature over the p...
Article
Metal foams are engineered materials with attractive mechanical properties such as lightness, energy dissi-pation capacity, high resistance and stiffness. To date, the applications of these materials are mainly limited to aeronautic and mechanical engineering. However, their features can provide significant advantages also for the development of ne...
Preprint
Beam-to-column joints equipped with friction dampers are promising solutions to improve the performance of steel moment resisting frames due to the possibility to guarantee large dissipation capacity limiting the structural damage under severe seismic conditions. In this paper, the experimental tests and the numerical simulations of two types of jo...
Article
Full-text available
Endurance Time (ET) method is a dynamic analysis in which the structures are subjected to a predefined intensifying acceleration. The inherently dynamic nature of ET makes it applicable for various types of structures with different heights and degrees of freedom. The purpose of this study is to investigate the feasibility of ET method for analyzin...
Article
In recent years, modular construction has been used in low-to medium rise multi-story and even high-rise buildings. Pre-fabrication by off-site manufacture leads to faster and safer construction, improved quality, reduced resources and waste. The research activity summarized in this paper is carried out within the European project INNO3DJOINTS and...
Article
Full-text available
This paper deals with the vulnerability assessment of historic masonry structures subjected to settlements using rigid block modelling. A 2-D rigid block model with unilateral elastic contacts and finite friction is developed for the evaluation of the displacement capacity in the large displacement regime by push-down analysis. A variational formul...
Article
Full-text available
Italy is located in a very active seismic zone, and many earthquakes have marked the country, some of them in the recent past. In order to take adequate measures of seismic prevention and protection, in the last decades, the Italian Civil Protection Department (DPC) initiated a survey and introduced a specific form for the quick and/or post-seismic...
Chapter
This paper deals with the behavior of the Qiandao prototype of submerged floating tunnel (SFT) against exceptional loads due to explosions and impacts. A preliminary study is carried out on a single module of the prototype, 100 m long, with a cross-section conceived as a layered circular steel concrete composite cross-section, with the external lat...
Article
In view of the development of heavy timber seismic-resistant structures, in the context of modern seismic design approach, a possible solution is to allow the timber structure to dissipate a part of the seismic energy. Since timber is a material with an elastic-fragile behaviour, the dissipative function should be delegated to connections, through...
Article
In this paper, a novel friction-resistant steel joint, allowing for easy repair, disassembly and reuse of structural elements, is presented. Thanks to specifically designed friction-based bolted clamps, the joint is fully restrained under serviceability conditions, while dissipates energy under life safety level seismic actions. In case of damage,...
Article
Full-text available
The seismic response of steel moment resisting frames (MRFs) is influenced by the behavior of joints. Within the ongoing research project “FUTURE”(Full-scale experimental validation of steel moment frame with EU qualified joints and energy efficient claddings under Near fault seismic scenarios), shake table tests will be carried out on a two-story...
Article
This paper presents an application of a simplified assessment approach to steel structures which takes into account sustainability requirements. The proposed approach is based on a time-dependent, multi-performance-based design methodology. The simplified procedure is organized in three main steps concerning the environmental conceptual design, the...
Article
Cold formed steel (CFS) wood sheathed shear walls are one of the most often used type of shear walls applied as the main lateral force resisting system (LFRS) in a lightweight steel (LWS) building. This paper evaluates the behavior factor used in the seismic design according to Eurocodes for buildings equipped with CFS wood sheathed shear walls as...
Article
The results of a preliminary experimental study carried out to evaluate the seismic behaviour of a bracing system, designed to reduce the seismic vulnerabilities in lightweight steel (LWS) suspended ceilings, are presented in the current paper. The experimental investigation involved 12 cyclic tests on the bracing system carried out according to FE...
Article
Two storey X bracings are currently very popular in European practice, as respect to chevron and simple X bracings, owing to the advantages of reducing the bending demand in the brace intercepted beams in V and inverted V configurations and optimizing the design of gusset plate connections. However, rules for two storey X braced frames are not clea...
Article
The recent seismic events have highlighted the need of tools for predicting the performance until collapse and hence assisting to minimize the damages and losses. A European project, named ELISSA, has been recently finished, in which the University of Naples Federico II has explored the seismic behaviour of a Cold Formed Steel (CFS) full-scale two-...
Article
Since ‘80s the use of external additive structures, commonly called exoskeletons, is considered one of the possible alternatives for seismic retrofit of existing r.c. structures with low dissipative capacity. The first Japanese and American codes dealing with structural rehabilitation issues, as well as many applications on the use of steel devices...
Article
Among various architectural non-structural components in a building, Lightweight Steel (LWS) drywall partitions are one of the most widely used partition systems. A set of simplified numerical models are proposed here for LWS drywall partitions to simulate their in-plane response, that can be easily integrated with the building models and possess t...
Article
Full-text available
Hybrid structures are efficient and economical systems that can be successfully adopted for modular buildings. Novel hybrid industrialized and modular buildings with truss girder made of lightweight steel profiles and connected to tubular columns by means of innovative plug-and-play joints have been recently proposed within the RFCS INNO3DJOINTS wi...
Article
This paper discusses the seismic vulnerability of Reinforced Concrete (RC) buildings designed to gravity loads only, which are representative of the Italian building stock mainly erected between ‘70s and ‘80s, and investigates the use of external steel concentric bracing systems to upgrade their seismic performance. A case study building has been s...
Article
The paper deals with the seismic investigation of two masonry churches, namely Visitazione and San Giuliano, which are located in Poggio Picenze, a small town about 10 km far from L’Aquila. The seismic response assessment of the churches, which were damaged by the severe seismic event occurred in Italy on 2009 April 6th, has been performed by means...
Article
Full-text available
The paper is related to the assessment of collapse mechanisms of historic masonry structures suffering settlements induced by ground movements. Two numerical strategies are adopted in order to study the influence of the settled zone on the cracking of masonry buildings: a discrete rigid block model and a continuous homogenized model. The first appr...
Conference Paper
Full-text available
Masonry structures belonged to the Cultural Heritage suffered severe damages in the last decays due to the action of the settlement-induced ground movements. The researchers have been developing numerical tools for the vulnerability analysis and assessment of masonry structures subjected to settlements. Continuous, discrete and rigid block models w...
Article
Full-text available
Background Corrosion propagation mainly occurs due to environmental conditions and to the absence of adequate maintenance. The corrosion propagation affects the structural performances of slender and thin structures, in particular in the case of structure very sensitive to the wind action and its dynamical phenomena, because commonly they are desig...
Conference Paper
Full-text available
The increasing development of the computational resources and numerical simulation methods explains the widespread use of finite element modelling (FEM) in both scientific field and design practice. Indeed, an increasing number of designers currently adopt the FEM based software for the calculation and assessment of non-conforming structures. In li...
Conference Paper
Italy is located in a very active seismic zone and many events have marked the country also in the recent past. In order to take adequate measures of seismic protection and prevention, in the last decade, the government is intensely working on the assessment of risks, associated to earthquakes, which important resources are devolved to. One of the...
Conference Paper
Many existing steel multi-storey frames in Europe were designed prior to the provisions of modern seismic design codes; therefore, they often exhibit low resistance to earthquakes due to their insufficient energy dissipation capacity. However, the current framework for assessing existing structures in EC8-3 is inadequate and should be reviewed. Par...
Article
Full-text available
The paper deals with the investigation of the seismic behaviour of a masonry church sited in Poggio Picenze (district of L’Aquila) and damaged by the L’Aquila seismic event occurred in Italy on 2009 April 6th. This earthquake, classified as an exceptional event, caused significant damages to about 15,000 buildings. Above all, many of the cultural s...
Article
Damage due to atmospheric corrosion on metal structures is a significant aspect for both the design of new construction and the maintenance of existing buildings. This problem is particularly felt for nineteenth-century wrought iron constructions, because of both lack of proper maintenance and architectonic value. The main objective of the current...
Article
A responsible use of resources is necessary to achieve a drastic reduction of environmental impact of the construction sector. This paper investigates the environmental impacts of a new dry construction based on the adoption of cold formed steel (CFS) members as main structural components, which was developed during the ELISSA European FP7 project....
Conference Paper
Recently, University of Naples “Federico II” in collaboration with Lamieredil S.p.A. Company has concluded experimental study focused on the investigation the seismic behavior of strap-braced CFS structures. In particular, a series of shake-table tests were performed on two reduced-scale strap-braced building structures. The specimens were three-st...
Conference Paper
The paper presents shear table testing of architectural non-structural drywall systems made of cold-formed steel-framed indoor partition walls, outdoor façade walls and suspended ceilings. The tests were carried out on two different typologies of prototypes (Type 1 and Type 2) for a total number of five specimens. The influence on seismic response...
Conference Paper
In view of the development of heavy timber seismic resistant structures, in the context of modern seismic design approach based on the mechanical triad of strength, stiffness and ductility, the dissipative capabilities should be delegated to specific devices, considering that timber mechanical behavior is typically fragile. With reference to the st...
Conference Paper
Recent research ventures focus on structural systems characterized either by low-damage or easily repairable solutions. In this context, moment resisting frames (MRFs) equipped with friction joints represent a viable option. Among the different types of friction beam-to-column connections, the arrangement with symmetric friction devices are very ef...
Article
Full-text available
This study aims to increase the knowledge of the seismic behaviour of low-to-medium rise structures, in which the seismic force-resisting system is provided by cold-formed steel strap-braced walls designed as non-energy-dissipating systems. The dynamic response of this system under seismic actions is analysed by performing shake table tests on two...
Article
Full-text available
Damage due to atmospheric corrosion on metal structures is a significant aspect for both the design of new constructions and the maintenance of existing buildings. The paper discusses the corrosion depth trends for steel structures comparing an experimental campaign of measurements, given by Fratesi in 2002, with literature 2 nd level models calibr...