Itsaso Arrayago

Itsaso Arrayago
Universitat Politècnica de Catalunya | UPC · Department of Civil and Environmental Engineering (DECA)

Lecturer

About

66
Publications
21,539
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
889
Citations
Citations since 2016
49 Research Items
863 Citations
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
Additional affiliations
September 2021 - September 2022
Universitat Politècnica de Catalunya
Position
  • PostDoc Position
September 2019 - September 2021
The University of Sydney
Position
  • PostDoc Position
March 2019 - August 2019
Pedelta S.L.
Position
  • Engineer

Publications

Publications (66)
Article
Stainless steel is an excellent construction material due to its high ductility, strain hardening, durability and aesthetic characteristics. To date, most studies on stainless steel have been devoted to understanding its mechanical properties and the behaviour of individual structural members and simple structures under monotonic loading. As a resu...
Conference Paper
Stainless steel alloys exhibit a nonlinear stress‐strain behaviour which can be precisely described by the Ramberg‐Osgood material model up to the ultimate stress. However, there is no consensus on the ductile fracture model under monotonic loading, which affects the post‐necking stress‐strain behaviour, to be adopted for stainless steels, even tho...
Article
Acknowledging the potential of system‐based design approaches, most international design standards for steel structures include preliminary versions of such alternative design methods. The Direct Design Method (DDM) is one of these approaches, which allows designing steel structures directly using advanced numerical analyses without requiring furth...
Article
Full-text available
Steel structures can be consistently and efficiently designed using system-based design-by-analysis approaches such as the Direct Design Method. However, since direct design approaches lead to potentially lighter structural configurations, they can also result in larger deformations under service loads. Thus, greater attention may be required to se...
Article
Steel frames with compact cross‐sections usually fail describing a plastic failure mechanism, redistributing internal forces. In order to fully form a plastic failure mechanism, the designed joints must be able to withstand the increase in stresses resulting from the redistribution of internal forces and to provide enough stiffness to prevent large...
Raw Data
Data was generated using the general purpose finite element software ABAQUS and performing advanced nonlinear analyses. The database is comprised of vertical and lateral system stiffness values corresponding to different random samples of six different nominal stainless steel frames under gravity and gravity plus wind load combinations. The values...
Article
Full-text available
In the process of developing the next generation of design standards for steel structures, most relevant international structural codes including AISC 360, AISC 370, AS/NZS 4100 and Eurocode 3 already incorporate preliminary versions of system-based design-by-analysis approaches that allow a direct evaluation of the strength of steel and stainless...
Article
Full-text available
Stainless steel is a structural material with great potential in seismic design due to its ductile and strain hardening characteristics. However, no specific seismic design provisions exist for stainless steel, despite the remarkable differences with carbon steel. Moreover, research on the behaviour of stainless steel under cyclic conditions is sca...
Article
Full-text available
First Order Reliability Methods (FORM) have been used by specification committees in the reliability analyses required for the calibration of resistance and safety factors for the past 40 years. However, these methods are iterative, require input information that may not be readily available, and make comparisons between different approaches or des...
Raw Data
This file includes finite element simulation data (ultimate load factors) carried out on 60 steel and stainless steel frames, including regular and irregular frame configurations with different section sizes. Ultimate load factors corresponding to different initial imperfection combinations are included.
Article
Full-text available
Initial geometric imperfections are unavoidable in steel members and frames due to erection and manufacturing tolerances. These include frame out-of-plumbness, member out-of-straightness and cross-sectional imperfections, and can have a significant influence on the response and resistance of steel structures. Thus, they need to be accounted for in...
Raw Data
Data was generated using the general purpose finite element software ABAQUS and performing advanced nonlinear analyses. The database is comprised of ultimate load factors corresponding to different random samples of six different nominal stainless steel frames under gravity and wind load combinations. The values of the random variable assignments a...
Article
Full-text available
Current design standards for stainless steel such as ASCE 8-02 and EN 1993-1-4 prescribe provisions for the design of cross-sections and members that account for material nonlinearities and strain hardening, although these features are not considered in the global design of structures. Recent studies have highlighted the need of accounting for mate...
Article
Full-text available
Material nonlinearity affects the stiffness and consequently the distribution of internal forces and moments in indeterminate structures. This has a direct impact on their behaviour and design, particularly in the case of stainless steel, where material nonlinearity initiates at relatively low stress levels. A method for accounting for the influenc...
Article
Full-text available
This paper summarises the background information and methodology used to derive a set of buckling curves proposed for cold-formed stainless steel columns and beams, incorporated in the recently revised SEI/ASCE 8-21 Specification. The study is based on experimental and numerical data collected from the literature on cold-formed stainless steel colu...
Conference Paper
The Continuous Strength Method (CSM) provides accurate cross-section resistance predictions since allowance is made for the partial spread of plasticity and the beneficial effects of strain hardening. Although CSM design provisions for different loading conditions are available, the method was limited to the determination of cross-sectional resista...
Conference Paper
Current codes for steel structures, including AISC 360-10, AS4100 and Eurocode 3, are in the process of evolving from the current member-based design method to direct system-based approaches that allow evaluating the strength of structures directly from numerical simulations. However, these codes do not provide adequate safety factors nor reliabili...
Conference Paper
Adequate mechanical properties make stainless steel an excellent construction material for structures. The current stainless steel European structural code EN1993-1-4 (2015) is largely based on provisions given for carbon steel EN1993-1-1 (2005) and does not establish specific design rules for the global analysis of stainless steel structures. Thus...
Article
The Continuous Strength Method (CSM) is a deformation based design approach that provides accurate cross-section resistance predictions by making rational allowance for the interaction between cross-section elements, the partial spread of plasticity and the beneficial effects of strain hardening. The CSM can be used in conjunction with advanced ana...
Article
Current structural codes for steel and stainless steel structures such as AISC 360-16, AISC 370-21, AS/NZS 4100 and Eurocode 3 are based on the traditional two-step member-based design approach, in which internal actions are first obtained from a structural analysis, usually elastic, and the strength of each member and connection is subsequently ch...
Raw Data
This file includes data on system strength of stainless steel frames under gravity loads obtained from the finite element simulations carried out on six stainless steel frames. This data was used in the analysis carried out and reported in the publication: Input and output data is provided separately for each of the six frames investigated. Frames...
Preprint
Current structural codes for steel and stainless steel structures such as AISC 360-16, AISC 370-21, AS/NZS 4100 and Eurocode 3 are based on the traditional two-step member-based design approach, in which internal actions are first obtained from a structural analysis, usually elastic, and the strength of each member and connection is subsequently ch...
Article
Full-text available
Austenitic stainless steel is an excellent construction material for structures required to withstand accidental loads such as seismic and/or fire events due to its appropriate mechanical properties, including high ductility, considerable strain hardening and good fire resistance. In recent years, a considerable amount of research has been devoted...
Article
Full-text available
Traditional member-based two-step design approaches included in current structural codes for steel structures, as well as more recent system-based direct-design alternatives, require building rigorous structural reliability frameworks for the calibration of partial coefficients (resistance factors) to achieve specified target reliability requiremen...
Article
Full-text available
Austenitic stainless steels offer a suitable combination of high ductility, adequate toughness, considerable strain hardening and good fire resistance, making them excellent construction materials, especially for structures subjected to accidental loading such as seismic and/or fire events. With most of the research over the recent years devoted to...
Preprint
Full-text available
Traditional member-based two-step design approaches included in current structural codes for steel structures, as well as more recent system-based direct-design alternatives, require building rigorous structural reliability frameworks for the calibration of partial coefficients (resistance factors) to achieve specified target reliability requiremen...
Article
Full-text available
The Continuous Strength Method (CSM) provides accurate resistance predictions for both stocky and slender stainless steel cross-sections; in the case of the former, allowance is made for the beneficial effects of strain hardening, while for the latter, design is simplified by the avoidance of effective width calculations. Although the CSM strain li...
Conference Paper
In recent years, a considerable amount of research has been devoted to the under-standing of the structural performance of single isolated stainless steel members. Notwithstand-ing, advances related to the analysis of more complex stainless steel structures, such as frames, are scarce. On this basis, a comprehensive experimental programme on sway a...
Conference Paper
High ductility, durability, strain hardening and good fire resistance make stainless steel an excellent construction material. In recent years, a considerable amount of research has been devoted to the understanding of the structural performance of single isolated stainless steel members. Notwithstanding, advances related to the analysis of more co...
Conference Paper
In recent years, a considerable amount of research has been devoted to the understanding of the structural performance of single isolated stainless steel members. Notwithstanding, advances related to the analysis of more complex stainless steel structures, such as frames, are scarce. On this basis, a comprehensive experimental program on sway and n...
Article
Full-text available
The use of composite floor slabs is well established and provides an opportunity to promote the use of visually exposed composite slabs. Stainless steels, with the combination of good mechanical properties and excellent corrosion resistance, are key to this strategy, specially ferritic stainless steels, whose price is lower and more stable than tha...
Article
Full-text available
Steel-concrete composite floors are commonly used in construction due to their favourable weight-to-depth ratio and erection time. Typically, concrete is poured onto a galvanised steel deck acting as formwork. However in case of floors exposed to corrosive environments, stainless steel is likely to be chosen over galvanised steel. Besides its bette...
Article
Steel-concrete composite structures are well established in the construction of floors and roofing, being interesting solutions as steel decks act as formwork for relatively large spans and support the weight of the concrete and construction loads. However, the use of stainless steel decks in such structures has been very limited, although their me...
Conference Paper
Additive and subtractive technologies are disrupting numerous fields in society at various levels. Until recent years, 3D printing has been limited to considerably industrialized sectors that have been historically provided with advanced technologies associated with computer numerical control (CNC). Educational environments have been seldom enriche...
Article
Full-text available
In structural frames, second order effects refer to the internal forces and moments that arise as a result of deformations under load (i.e. geometrical nonlinearity). EN 1993-1-1 states that global second order effects may be neglected if the critical load factor of the frame αcr is greater than or equal to 10 for an elastic analysis, or greater th...
Article
Full-text available
This paper presents a comprehensive study on the application of global plastic design methods, not currently allowed in European specification provisions, to stainless steel rectangular and square hollow section continuous beams. The analysis of experimental and numerical continuous beam strengths highlighted that ultimate capacity predictions calc...
Conference Paper
Full-text available
The Continuous Strength Method provides excellent resistance predictions of stocky cross-sections under different loading conditions as it accounts for enhanced material properties, although the method is currently limited to crosssectional resistance. The axial stress in short columns potentially exceeds the yield strength as members are stable en...
Conference Paper
Full-text available
Steel-concrete composite floors are commonly used in construction due to their favourable weight-to-depth ratio and erection time. Typically, concrete is poured onto a galvanised steel deck acting as formwork. However in case of floors exposed to corrosive environments, stainless steel is likely to be chosen over galvanised steel. Besides its bette...
Article
The use of stainless steel structures has increased during the last decade due to their durability, aesthetics and mechanical properties such as ductility, considerable strain hardening and excellent fire resistance. However, the majority of conducted research works have only focused on single isolated stainless steel members and advances in the an...
Article
Link elements are dissipative devices in form of beam segments that are typically included in eccentrically braced frames (EBF) subjected to lateral loads and seismic hazard. Studies related to short links, energy dissipation and plastic hinge formation have been presented for carbon steel elements with several conclusions at material, member and s...
Article
Full-text available
The behaviour of austenitic, ferritic and duplex stainless steel Rectangular and Square Hollow Section members subjected to compression and combined loading is investigated in this paper. A full slenderness range Direct Strength Method (DSM) approach is proposed based on experimental results and numerical strengths obtained from FE parametric studi...
Article
Full-text available
This paper studies the cross-sectional behaviour of austenitic, ferritic and duplex stainless steel hollow sections subjected to several loading conditions and presents a full slenderness range DSM approach for the prediction of cross-sectional strengths. Pure compression, pure bending moment and combined uniaxial bending and compression loading re...
Conference Paper
This paper presents a full slenderness range DSM approach for the prediction of the cross-sectional resistance of ferritic stainless steel hollow sections subjected to different loading conditions using the same strength curve. The analysis is based on the experimental data gathered from the literature and ultimate strengths generated through param...
Article
Development of efficient design guidance for stainless steel structures (considering non-linear behaviour, strain hardening and allowing for moment redistribution in indeterminate structures) is crucial for the widespread use of this corrosion-resistant material. This paper presents an experimental programme involving ferritic stainless steel simpl...
Article
Development of efficient design guidance for stainless steel structures is key for the increased use of this corrosion-resistant material by considering both nonlinear behaviour and strain hardening into resistance prediction expressions, together with the moment redistribution in indeterminate structures. With the aim of analysing the bending mome...
Article
Ferritic stainless steels, with their lower nickel content, supplement the desirable features offered by different stainless steel grades with a more controlled and lower initial investment requirements, which have encouraged the use of these materials in construction. The nonlinear behaviour of stainless steel grades is not usually considered when...
Article
Full-text available
The excellent corrosion resistance presented by all stainless steel grades, together with their appropriate mechanical properties, aesthetic appearance and easy maintenance, makes these metallic alloys perfect for sustainable structural performances. However, their nonlinear stress-strain behaviour, together with their strong strain hardening featu...
Article
Full-text available
There is a wide variety of stainless steel alloys, but all are characterized by a rounded stress–strain response with no sharply defined yield point. This behaviour can be represented analytically by different material models, the most popular of which are based on the Ramberg–Osgood formulations or extensions thereof. The degree of roundedness, th...
Conference Paper
The desirable features offered by different stainless steel grades have encouraged the use of this material in construction and the lower nickel content of the ferritic grades allows, additionally, controlling and decreasing the initial investment needs. Design expressions codified for carbon steel have been extended to stainless steel elements in...
Article
Stainless steels are ideal for sustainable structural performances due to their excellent corrosion resistance, appropriate mechanical properties, aesthetic appearance and easy maintenance. However, the nonlinear behaviour and strain-hardening effects characterizing these materials make them different from carbon steel and some specific guidance is...
Conference Paper
Development of efficient design guidance for stainless steel structures is key for the spreading of this corrosion-resistant material by considering both nonlinear behavior and strain hardening into predicting expressions, together with allowing the consideration of moment redistribution in indeterminate structures.With the aim of analyzing the ben...
Article
The usage of stainless steel in construction has been increasing owing to its corrosion resistance, aesthetic appearance and favourable mechanical properties. The most common stainless steel grades used for structural applications are austenitic steels. The main drawback of these grades relies on their nickel content (around 8–10%), resulting in a...
Article
During the last decades, various material models have been proposed describing stainless steel nonlinear behaviour through different parameters. The differences among these models are analysed herein using experimental data of different stainless steel types. An interactive computer programme, usable for any series of experimental data, is develope...
Article
Cold-formed stainless steel members are widely used due to their high corrosion resistance and high resistance-to-weight ratio but their susceptibility to buckle implies that instability phenomena such as web crippling, where the web locally buckles due to concentrated transverse forces, must be considered. On the other hand, the emergent ferritic...
Thesis
Full-text available
Stainless steel is a relatively new metallic material which presents a combination of good mechanical properties and excellent corrosion resistance. The price of ferritic stainless steel is stable due to its low nickel content whilst still maintaining good mechanical properties. On the other hand, the use of composite floor slabs is well establishe...

Network

Cited By

Projects

Projects (3)
Project
The most recent versions of major international steel specifications (i.e., AISC 360-16, AISC 370-21, AS/NZS 4100 and Eurocode 3) incorporate preliminary versions of system-based design-by-analysis approaches, which allow evaluating the strength of structures directly from numerical simulations. These methods present several important advantages over the conventional member-based two-step design approach: (i) the system strength can be directly evaluated from the analysis without requiring complex and time-consuming member checks; (ii) inelastic analysis may lead to the design of lighter and more economical structures since the load redistribution capacity of the system is fully exploited; and (iii) the actual system behaviour is accurately captured and failure modes can be explicitly identified. However, it is not possible to predict the actual strength of steel structures with certainty because uncertainties exist in structural properties and applied loads, and strategies are necessary to guarantee that reliability requirements are met i.e., the calibration of system resistance and safety factors for the different types of structure types and material covered in the specifications. With the objective of investigating acceptable target reliability indices for stainless steel structural systems and to provide adequate system safety factors and system resistance factors, a rigorous structural reliability framework has been built for stainless steel structures, extending the applicability of system-based design-by-analysis approaches.
Archived project
This project aims at fundamental understanding the behavior of ferritic stainless steels when they are used as proof material for structural applications in the construction sector, and develop and obtain design expressions in order to check the structural types according to the limit states method, considering all design aspects that constrain or define the choice of steel and the structural type. Logically, the primary objective will be restricted to specific structural types listed in the project: stub columns and members subjected to compression and combined loading.
Project
The aim of the project is to contribute to the design of structurally efficient sustainable buildings with full immersion in circular economies and with particular abilities of instrumentation and data management that provide designers and users alike more controllable and safer structures in the age of information and digital economies. The research project encompasses experimental and numerical analysis of stainless steel frames primarily subjected to static loads for the sake of establishing rules associated to the design of such frames. Subsequently, the study will be extended to the numerical analysis of stainless steel frames subjected to catastrophic events such as earthquakes and fire with particular emphasis in quantifying the beneficial aspects of such structural material. The results of the research project may be implemented in future versions of EN1993-1-4 and in innovative rules of structural applications of stainless steel frames.