Eva Lantsoght

Eva Lantsoght
Universidad San Francisco de Quito (USFQ) · Department of Civil Engineering

27.97
 · 
Dr., Ir., MS
About
151
Research items
34,861
Reads
521
Citations
Research Experience
Dec 2016
Universidad San Francisco de Quito (USFQ)
Position
  • Profesor Investigador Titular Principal
Nov 2013 - Nov 2016
Universidad San Francisco de Quito (USFQ)
Position
  • Professor (Assistant)
Jul 2013
Delft University of Technology
Position
  • Researcher
Description
  • Continued research on shear problems in slabs and assessment of slab bridges. Research on fatigue in concrete under compression. Research related to proof loading of bridges.
Education
Sep 2009 - Jun 2013
Delft University of Technology
Field of study
  • Structural Engineering - Concrete Structures
Aug 2008 - Aug 2009
Georgia Institute of Technology
Field of study
  • Structural Engineering
Sep 2003 - Jun 2008
Vrije Universiteit Brussel
Field of study
  • Burgerlijk Ingenieur
Network
Cited By
Followers
Following
Projects
Projects (18)
Project
Many existing and newly constructed bridges are reinforced and prestressed concrete bridges. Advanced concrete materials play an increasingly important role in concrete bridges: to facilitate the strengthening and repair of existing bridges, to facilitate a (fast) replacement solution for (a part of) an existing bridge, and for the design of new challenge bridge projects. The development of advanced concrete materials, and their structural applications, is thus an important topic in the built environment. This Special Issue brings together research and practical applications, from the perspective of material scientists and bridge engineers, for the application to new and existing bridges. Contributions related to (but not limited to) the following topics are welcome: • Design of concrete bridges or bridge elements using advanced concrete materials • Repair of existing concrete bridges using advanced concrete materials • Strengthening of existing concrete bridges using advanced concrete materials • Testing of bridges built with advanced concrete materials • Long-term performance of bridges built with advanced concrete materials • Case studies of relevant bridge projects • Sustainability and life-cycle analysis of bridges using advanced concrete materials • Development of advanced concrete materials for bridge engineering applications • Relation between advanced concrete materials and construction execution aspects Research articles, case studies, review papers, and short communications are welcome for submission to this Special Issue. I hope that these contributions will provide a good overview of the state-of-the-art of advanced concrete materials in bridge engineering. Therefore, I would like to invite you to submit your paper for this Special Issue and to share this call for papers with your colleagues.
Project
Experiments on girders taken from an existing bridge
Project
Evaluating the static and fatigue punching shear capacity of the thin transversely prestressed concrete decks in slab-between-girder bridges
Research
Research items (151)
Article
Full-text available
Proof load testing of existing reinforced concrete bridges is becoming increasingly important as the current bridge stock is aging. In a proof load test, a load that corresponds to the factored live load is applied to a bridge structure, to directly demonstrate that a bridge fulfills the code requirements. To optimize the procedures used in proof l...
Article
Full-text available
Though Brazilian academia claims equality, the sector has largely been referred to as non-meritocratic, and academic hiring is still inward-oriented. The Lattes platform, a public curricular information system, reflects elements of this protectionism. This article assesses two ‘obsessions’ in Brazilian academia: the ‘mandatory’ Lattes CV, and the a...
Conference Paper
Full-text available
The Critical Shear Displacement Theory (CSDT) was developed to determine the shear capacity of reinforced concrete beams based on the different shear-carrying mechanisms (concrete in the compression zone, aggregate interlock, and dowel action). This research aims at extending the CSDT to Steel Fibre Reinforced Concrete (SFRC) by adding the contribu...
Preprint
Full-text available
In the Netherlands, the assessment of existing prestressed concrete slab-between-girder bridges showed that the thin, transversely prestressed slabs may be critical for static and fatigue punching when evaluated using the recently introduced Eurocodes. On the other hand, compressive membrane action increases the capacity of these slabs and changes...
Article
Full-text available
Existing bridges with large uncertainties can be assessed with a proof load test. In a proof load test, a load representative of the factored live load is applied to the bridge at the critical position. If the bridge can carry this load without distress, the proof load test shows experimentally that the bridge fulfills the requirements of the code....
Article
Full-text available
Adding steel fibers to concrete improves the capacity in tension-driven failure modes. An example is the shear capacity in steel fiber reinforced concrete (SFRC) beams with longitudinal reinforcement and without shear reinforcement. Since no mechanical models exist that can fully describe the behavior of SFRC beams without shear reinforcement faili...
Preprint
Albeit its constitutional claim for quality, Brazilian academia has largely been referred to as unmeritocratic and academic hiring is still inward-oriented. Lattes platform, a public curricular information system, reflects elements of this protectionism. This article assesses two ‘obsessions’ in Brazilian academia: (i) the ‘mandatory’ Lattes CV, an...
Preprint
‘If there is one thing every bibliometrician agrees, is that you should never use the journal impact factor (JIF) to evaluate research performance for an article or an individual – that is a mortal sin’. Few sentences could define so precisely the uses and misuses of the Journal Impact Factor (JIF) better than Anthony van Raan’s. This manuscript pr...
Preprint
Full-text available
Adding steel fibers to concrete improves the capacity in tension-driven failure modes. An example is the shear capacity in steel fiber reinforced concrete (SFRC) beams with longitudinal reinforcement and without shear reinforcement. Since no mechanical models exist that can fully describe the behavior of SFRC beams without shear reinforcement faili...
Preprint
Full-text available
According to the current codes and guidelines, shear assessment of existing reinforced concrete slab bridges sometimes leads to the conclusion that the bridge under consideration has insufficient shear capacity. The calculated shear capacity, however, does not consider the transverse redistribution capacity of slabs, thus leading to overconservativ...
Answer
That's true, but the committee may be interested in new databases that you develop.
Answer
The uncertainty that lies at the basis of needing a factor usually are a combination of modeling uncertainties, geometric, and material uncertainties. So, even when the model itself is "perfect" you would still have geometric and material uncertainties.
Answer
Hi! Are you involved with the ACI-DAfStB group on shear databases?
Conference Paper
Full-text available
The capacity of existing bridges is an important aspect regarding the safety of the traveling public. Proof load testing can be a useful option to evaluate if an existing bridge satisfies the requirements from the code. The stop criteria provided by the Guidelines are generally suitable for flexure only. Therefore, in this paper, shear is considere...
Conference Paper
Full-text available
When performing proof load tests, irreversible damage may occur. Guidelines for performing the test have been developed, which establish stop criteria to terminate the test before this happens. The stop criteria prescribed in the currently available codes are mainly designed for buildings, but load tests are also performed on bridges. This investig...
Conference Paper
Full-text available
In a proof load test, a load representative of the factored live load is applied to the bridge. Since the applied load is large, stop criteria are important. Stop criteria for shear and flexure are proposed based on existing codes and guidelines, laboratory experiments, and theoretical considerations. This proposal is verified with the results from...
Conference Paper
Full-text available
Proof load testing is used to assess the structural capacity of existing bridges. Stop criteria, based on measurements taken during proof load tests, determine if a test should be stopped before reaching the target proof load in order to maintain structural integrity. A nonlinear finite element model is proposed to investigate stop criteria. A rein...
Preprint
Full-text available
Albeit its constitutional claim for quality, Brazilian academia has largely been referred to as unmeritocratic and academic hiring is still inward-oriented. Lattes platform, a public curricular information system, reflects elements of this protectionism. This article assesses two ‘obsessions’ in Brazilian academia: (i) the ‘mandatory’ Lattes CV, an...
Preprint
Full-text available
If there is one thing every bibliometrician agrees, is that you should never use the journal impact factor (JIF) to evaluate research performance for an article or an individual-that is a mortal sin'. Few sentences could define so precisely the uses and misuses of the Journal Impact Factor (JIF) better than Anthony van Raan's. This manuscript prese...
Conference Paper
Full-text available
In this paper, a study on the calibration of the shear stop criteria based on the crack kinematics from DIC measurements is presented. The crack kinematics were derived from four experiments on RC beams without shear reinforcement including two flexural failure tests and two flexural shear failure tests. The presented study is an addition to a prev...
Conference Paper
The arched strut is an addition to the strut-and-tie (STM) tool kit. It models the combination of disturbed behavior in one direction with slender behavior in the perpendicular direction. Common applications for the arched strut are in the design of connections between a reinforced concrete slab and its supporting columns or punching of bridge deck...
Conference Paper
Strut-and-tie models (STM) are appropriate for analyzing and designing disturbed regions in a reinforced concrete structure. The arched strut is an addition to the STM tool kit. It models the combination of disturbed behavior in one direction with slender behavior in the perpendicular direction. The arched strut is part of the Strip Model, original...
Conference Paper
In a proof load test, the applied load is representative of the factored live load, to demonstrate experimentally that the bridge fulfils the code requirements. Signs of distress must be caught with the instrumentation by defining stop criteria. In the literature, several stop criteria for flexure are available. The German guidelines describe, amon...
Conference Paper
In 1997 the Second Stichtse Bridge, a high strength concrete box girder bridge was built in the Netherlands using the balanced cantilever method. At that time, the long-term behaviour of this material (with a cube compressive strength of 75 MPa) was not known. Therefore, it was proposed to monitor the material behaviour and the deflections of the b...
Conference Paper
As the existing bridge stock is aging, improved assessment methods such as proof load testing become increasingly important. Proof load testing involves large loads, and as such the risk for the structure and personnel can be significant. To capture the structural response, extensive measurements are applied to proof load tests. Stop criteria, base...
Chapter
In this chapter, the research question is studied. We focus on how to find a research question that is specific enough, so that you are not tempted to explore paths that are only tangentially related to your research question. The literature review identifies gaps in the current knowledge, and you will learn how to frame a research question within...
Chapter
In this chapter, we discuss technical presentations. The first topic talks about planning towards a presentation, and the different steps you need to think about when planning. Then, we discuss briefly the different formats that can be used to make a presentation. The second topic deals with the logical order of a presentation. Two styles are discu...
Chapter
In this chapter, a number of first skills that can be useful for a beginning PhD student are revised. A first topic is “familiarizing yourself with your new workplace and your new city”. You will receive tips on how to get settled in your new workplace, and which procedures you need to review with Human Resources and immigration offices. We provide...
Chapter
In this chapter, we discuss science communication in the twenty-first century. We explore the opportunities the internet offers us to expand our research network and share our knowledge with a wider audience. A first topic is blogging as a researcher. The different ways of contributing with blog posts, as well as the different platforms for bloggin...
Chapter
In the final chapter of this book we look at life after the PhD. The first topic is letting it all sink in after the defense. We talk about the emptiness some people feel after finishing their PhD, how to deal with this, and how to answer the question of “What is next in life”. We also highlight the importance of celebrating the major achievement o...
Chapter
This chapter covers your literature review. The first topic is related to finding the right references. We discuss how broad and how deep you should be reading to explore the literature in your field. You get tips for finding references. After the part about finding the references and reading them comes the topic on how to process the references. W...
Chapter
In this chapter, we discuss all steps necessary to prepare for your first conference. The first topic deals with selecting a conference and provides guidance on how to find a suitable venue for presenting your work for the first time. Then, we explore the possible topics for a conference paper. Based on the preliminary work you have ready, a number...
Chapter
background and motivation
Chapter
In this chapter, we discuss writing the dissertation. The first topic deals with planning the writing of a dissertation. We discuss how to estimate the amount of time that you need for your writing, and how you can spread out the writing so that you can move forward slowly but surely, without needing to pull all-nighters or other forms of writing s...
Chapter
This chapter follows the steps you should take when planning experiments. The focus of this chapter is on experiments in STEM, in a research laboratory. You start by revisiting the literature review. Based on the literature review, and the experience reported by other researchers, you can design your first test setup. Next comes planning of experim...
Chapter
This chapter deals with writing your first journal article. First, we discuss how to select the right journal for the publication. The audience, the impact factor and journal rankings are discussed, as well as the current possibilities and pitfalls with open access publishing. Then, we look at planning the writing of a journal paper, and finding ti...
Chapter
In this chapter, planning and time management are discussed. A top-down approach for planning is explained, where we start from the entire period of the PhD trajectory (with 4 years as a reference), planning the major milestones. Then, we make a monthly, weekly and daily planning. Technological tools and smartphone applications that can be used to...
Chapter
This chapter on academic writing serves as a reference for a number of topics discussed throughout the textbook. Instructors can decide to teach this topic before talking about the literature review. This chapter is subdivided into the following topics: structuring writing, finding your voice, tips for non-native English speakers, and tips for prod...
Book
This textbook is a guide to success during the PhD trajectory. The first part of this book takes the reader through all steps of the PhD trajectory, and the second part contains a unique glossary of terms and explanation relevant for PhD candidates. Written in the accessible language of the PhD Talk blogs, the book contains a great deal of practica...
Article
A large subset of the Dutch bridge stock consists of reinforced concrete slab bridges, for which assessment often results in low ratings. To prioritize the efforts of the bridge owner, more suitable assessment methods for slab bridges are necessary. Research efforts over the past years resulted in the development of several methods, at levels requi...
Article
Nowadays, finite element analyses provide information about the performance of a structure, but they are more or less simplified. Therefore, load tests are the only way to find the “real” behavior of an existing bridge subjected to the rating process. In this paper, the state-of-the-art concerning load tests of concrete road bridges is presented, a...
Conference Paper
In a proof load test, a load corresponding to the factored live load is applied to a bridge, to directly demonstrate that a bridge fulfils the code requirements. The case of viaduct De Beek, a four-span reinforced concrete slab bridge that did not fulfil the requirements for bending moment after an inspection survey is studied. The middle spans, lo...
Article
In 1997, the Second Stichtse Bridge was built in the Netherlands using the balanced cantilever method. The use of high-strength concrete was proposed. At that time, the long-term behaviour of this material was not known, and no code provisions were applicable. Therefore, it was proposed to monitor the material behaviour and the deflections of the b...
Article
As the bridge stock in the Netherlands and Europe is ageing, various methods to analyze existing bridges are being studied. Proof load testing of bridges is an option to experimentally demonstrate that a given bridge can carry the prescribed live loads. Based on extensive research on proof load testing of reinforced concrete slab bridges carried ou...
Article
For existing bridges, proof-load testing can be a suitable assessment method. This paper addresses the evaluation of a posted reinforced concrete slab bridge over a highway through proof-load testing, detailing the preparation, execution, and analysis of the test. As the target proof-load and the required measurements for proof-load testing current...
Chapter
This chapter discusses a case study of the field assessment through visual inspection and load testing of a reinforced concrete bridge with cracking caused by alkali-silica reaction, the viaduct Zijlweg. The first main topic of this chapter is the preparation, execution, and postprocessing of the load test, through which it could be demonstrated th...
Article
Load testing of bridges is a practice that is as old as their construction. In the past, load testing gave the traveling public a feeling that a newly opened bridge is safe. Nowadays, the bridge stock in many countries is aging, and load testing is used for the assessment of existing bridges. This paper aims at giving an overview of the current sta...
Conference Paper
Full-text available
For existing bridges with large uncertainties, analytical methods have limitations. Therefor e, to reduce these uncertainties, field testing of a bridge can be used. A type of such a field test is a proof load test, in which a load equivalent to the factored live load is applied. If the bridge can carry this load without signs of distress, the proo...
Article
Existing reinforced concrete solid slab bridges in the Netherlands are re-assessed for shear based on a Unity Check: the ratio of the shear stress caused by the applied loads to the shear capacity of the concrete cross-section. The governing shear stress resulting from the self-weight, weight of the wearing surface, distributed and concentrated liv...
Article
Proof load testing is part of the engineering practice, and can be particularly useful for the rating of existing bridges. This paper addresses how reliability-based concepts can be used in combination with proof load testing, and discusses how this approach differs from the current practice for proof load testing. Whereas the calculation methods f...
Conference Paper
Full-text available
Proof loading of existing bridges is an option to study the capacity when crucial information about the structure is lacking. To define the loading criteria for proof load testing, a review of the literature has been made, finite element models of existing viaducts have been made, and on these viaducts, proof loading tests have been carried out. Th...
Conference Paper
Full-text available
Proof load testing can be a suitable method to show that a bridge can carry the required loads from the code without distress. This paper addresses the preparation, execution, and analysis of a proof load test on a four-span reinforced concrete solid slab bridge, viaduct de Beek. The bridge has one lane in each direction, but was restricted to a si...
Article
The loads that are used for the assessment of existing reinforced concrete slab bridges are the self-weight, superimposed loads, and distributed and concentrated live loads. As such, the shear capacity of reinforced concrete slabs under a combination of distributed and concentrated live loads is a topic of practical relevance. For slabs subjected t...
Article
Proof load tests of bridges can be very useful for structures with a lack of information, or for structures of which the effect of material degradation is difficult to assess. Contrary to diagnostic load testing, proof load testing is not well-defined in current standards in terms of required load and analysis of measurements. The risk related to t...
Article
Loading protocols and acceptance criteria are available in the literature for load tests on buildings. For bridges, proof load tests are interesting when crucial information about the structure is missing, or when the uncertainties about the structural response are large. The acceptance criteria can then be applied to evaluate if further loading is...
Conference Paper
Proof loading of existing bridges is an interesting option when insufficient information about a bridge is available. To safely carry out a proof loading test, high loads are placed on the bridge. To avoid permanent damage to the structure, a controlled loading protocol needs to be described, and the measurements need to be closely monitored to ide...
Conference Paper
Reinforced concrete slab bridges are assessed for a combination of loads that include self-weight, superimposed loads, and distributed and concentrated live loads. The shear capacity of reinforced concrete slabs subjected to a combination of loads is thus an important topic for the assessment of existing bridges. Currently, a plastic model exists f...
Article
Concrete is a compound material where aggregates are randomly placed within the cement paste. To describe the behavior of concrete structures at the ultimate, it is necessary to use nonlinear finite element models, which for shear and torsion problems do not always give satisfactory results. The current study aims at improving the modeling of concr...
Article
The bridges built during the development of the Dutch road network after the Second World War are reaching their originally devised service life. A large subset of the Dutch bridge stock consists of reinforced concrete slab bridges. This bridge type often rates insufficient according to the recently introduced Eurocodes. Therefore, more suitable me...
Article
Typically, beam shear failure is studied by testing small, heavily reinforced beams subjected to concentrated loads, and punching shear failure by testing slab-column connections. Both cases are related to shear in slender, flexural members. For deep members, strut-and-tie methods provide solutions. One-way slabs subjected to concentrated loads clo...
Conference Paper
Full-text available
The bridges built during the development of the Dutch road network after the Second World War are reaching their originally devised service life. A large subset of the Dutch bridge stock consists of reinforced concrete slab bridges. This bridge type often rates insufficient according to the recently introduced Eurocodes. Therefore, more suitable me...
Article
Most methods for the design and analysis of reinforced concrete slabs for punching are based on experiments on slab-column connections, reflecting the situation in building slabs. Slab-column connections with unbalanced moments have also been studied in the past. Experiments indicate that the accuracy of models for asymmetrically loaded slabs is lo...
Article
In the Netherlands, the shear capacity of a large number of existing reinforced concrete solid slab bridges is subject to discussion, as initial assessments indicated that their capacity was insufficient. In certain cases, the deterministic value of the moment capacity is larger than the deterministic value of the shear capacity. However, when the...
Article
A large number of existing reinforced concrete solid slab bridges in the Netherlands are found to be insufficient for shear upon assessment. However, research has shown additional sources of capacity in slab bridges, increasing their total capacity and possibly changing their failure mode. Previous testing was limited to half-scale slab specimens c...
Conference Paper
Full-text available
In August 2014, the Ruytenschildt Bridge, a reinforced concrete solid slab bridge (reinforced with plain bars) in the Friesland province in the Netherlands was tested until failure. One of the goals of proof loading and testing this bridge to failure, was to study the failure mode of existing slab bridges. The combination of smaller shear capacitie...
Conference Paper
Full-text available
As the bridge stock in The Netherlands and Europe is ageing, various methods to analyse existing bridges are being studied. Proof loading of bridges is an option to study the capacity when crucial information about the structure is lacking. This information could be related to the material (for example, the effect of alkali-silica reaction on the s...
Conference Paper
Full-text available
Proof loading of bridges is an option to study existing bridges when crucial information is lacking. When proof loading is chosen, the question arises which maximum load should be attained during the test to demonstrate sufficient capacity, and which criteria, the “stop criteria”, based on the measurements during the test, would indicate that the t...
Article
In the Netherlands, the shear capacity of a large number of existing reinforced concrete solid slab bridges is subject to discussion, as initial assessments indicated that their capacity was insufficient. In certain cases, the deterministic value of the moment capacity is larger than the deterministic value of the shear capacity. However, when the...