Santos Sánchez-Cambronero

Santos Sánchez-Cambronero
University of Castilla-La Mancha · Civil Engineering

PhD in Civil Engineering

About

41
Publications
7,930
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737
Citations
Additional affiliations
September 2004 - December 2016
University of Castilla-La Mancha
Position
  • Professor (Assistant)

Publications

Publications (41)
Article
Full-text available
To realize the design of mixed-traffic railway lines, the choice of radius must ensure a comfortable ride for passenger vehicles, safe freight transport, and acceptable maintenance costs of vehicle wheels and railway infrastructure. This is not a straightforward task, and what is worse, there is a worldwide lack of clear criteria to limit the desig...
Article
It is well known that the location of Automatic Vehicle Identification (AVI) sensors on a traffic network for route flow estimation is a complex problem. Heuristics and metaheuristic tools have been proved to provide good results mainly for large networks where exact approaches require high (exponential) computational times. The numerous contributi...
Article
Full-text available
The traffic flow on road networks is dynamic in nature. Hence, a model for dynamic traffic flow estimation should be a very useful tool for administrations to make decisions aimed at better management of traffic. In fact, these decisions may in turn improve people’s quality of life and help to implement good sustainable policies to reduce the exter...
Article
Full-text available
In the last years, more and more studies have highlighted the advantages of complementing traditional master classes with additional activities that improve students’ learning experience. This combination of teaching techniques is specially advised in the field of structural engineering, where intuition of the structural response it is of vital imp...
Preprint
In the last years, more and more studies highlight the advantages of complementing traditional master classes with additional activities that improve students´ learning experience. This combination of teaching techniques is specially advised in the field of structural engineering, where intuition of the structural response it is of vital importance...
Article
Full-text available
In recent years Spain shows the great reduction in the accident rate that has been achieved and the improvement of the behavior of road users, despite this, there is still a need to improve many areas. In 2016 for the first time since the last 13 years, the number of deaths increased by 7% concerning to the previous year. In this paper, analysis, a...
Article
Full-text available
Technical communication is an extremely important soft skill for civil engineers at the workplace. Due to globalization trends this technical communication often should be performed in English. If we join the fact that undergraduate engineering programs in Spain have been taught exclusively in Spanish, with which in addition, in rare cases those pr...
Article
Full-text available
In recent years, different techniques to address the problem of observability in traffic networks have been proposed in multiple research projects, being the technique based on the installation of automatic vehicle identification sensors (AVI), one of the most successful in terms of theoretical results, but complex in terms of its practical applica...
Article
Full-text available
A number of research papers have recently shown that the use of techniques based on the installation of vehicle identification devices allows us to address the observability problem of a traffic network in a much more efficient way than if it were done with traditional techniques. The use of such devices can lead to a better data set in terms of fl...
Article
Full-text available
This article presents the application of the problem-based learning (PBL) methodology for introducing the civil engineering task of bridge design and construction to high school students with a multidisciplinary approach. The materials (toy construction system) and methodology of the workshop are first presented. Then, three examples of arch typolo...
Preprint
Full-text available
This article presents the application of the problem-based learning (PBL) methodology for introducing the civil engineering task of bridge design and construction to high-school students with a multidisciplinary approach. The materials (toy-construction system) and methodology of the workshop are first exposed. Then, three examples of arch typology...
Conference Paper
Full-text available
Traditionally, Spanish schools of civil engineering provide their students a class on “Technical English” in order to develop their language skills. However, this class does not cover all the skills that the student would need in the labor market and mainly focuses in the reading and writing skills, and in a lower degree in the speaking and listeni...
Article
The management of vehicle travel times has been shown to be fundamental to traffic network analysis. To collect travel time measurement, some methods focus solely on isolated links or highway segments, and where two measurement points, at the beginning and at the end of a section, are deemed sufficient to evaluate users' travel time. However, in ma...
Article
Full-text available
This paper deals with traffic network modelization problem when plate scanning is going to be used for route flow estimation as well as for obtaining Origin-Destination matrix and traffic network assignment. With the aim of carrying out this modelization, we set out a methodology which has a global perspective of the network simplification. This me...
Article
Full-text available
The aim of the paper is to present a numerical model for a ballasted railway track that includes the dynamic effect of a moving train load and predicts the values of the vertical stiffness of the infrastructure. This model is therefore deemed to be a tool for the evaluation of the state of the track during service situations as well as a predictive...
Article
Full-text available
This paper presents a methodology for the dynamic estimation of traffic flows on all links of a network from observable field data assuming the first-in-first-out (FIFO) hypothesis. The traffic flow intensities recorded at the exit of the scanned links are propagated to obtain the flow waves on unscanned links. For that, the model calculates the fl...
Conference Paper
The aim of the paper is to present a numerical model for a ballasted railway track that includes the dynamic effect of a moving train load and predicts the values of the vertical stiffness of the infrastructure. This model is therefore deemed to be a tool for the evaluation of the state of the track during service situations as well as a predictive...
Article
The existence of zones along a railway line that have abrupt changes in the vertical track stiffness is a well-known phenomenon. It results in the need for constant maintenance activities to keep the quality of the track within an acceptable range; which, in turn, increases the operational and maintenance costs of the line. The causes of these zone...
Article
The article provides a new Markovian–Bayesian network model to evaluate the probability of accident associated with the circulation of trains along a given high speed or conventional railway line with special consideration to human error. This probability increases as trains pass throughout the different elements encountered along the line. A Bayes...
Article
Previous studies have found that nontechnical skills, like, for example, communication, team work, and solving open-ended problems, are abilities that civil engineers must possess to perform their professional duties. However, the traditional teacher-centered methods employed in civil engineering schools do not encourage students to develop these s...
Article
Full-text available
This article presents alternate double–single track (ADST) lines as an alternative to double-track lines. The idea consists of using single track where the infrastructure is very expensive (tunnels and viaducts) and double track where it is cheaper (smooth orography) combined with small changes in departure times so that trains may cross in the dou...
Article
In this paper a hierarchical optimization problem generated by a Bayesian method to estimate origin-destination matrices, based on Gamma models, is given. The problem can be considered as a system of equations in which three of them are optimization problems: (1) a Wardrop minimum variance (WMV) assignment model, which is used to derive the route c...
Article
In this paper we deal with the travel time reliability PUE (probabilistic user equilibrium) problem studied by Lo et al. (2006) [12] and Nie (2011) [15] and we propose an alternative model that assumes a location-scale family for the path travel times, whose means and variances are evaluated in terms of link travel times. This avoids the use of the...
Article
This paper considers the problem of modeling railway track substructure. The most commonly used methodology for designing the railway substructure cross section does not considerably differ from that proposed in the 1980s. For the bearing capacity of the subgrade, the currently used design methodology implicitly meets one objective: the stresses tr...
Article
In this paper, we deal with the traffic assignment problem solving a multiclass equilibrium problem. In particular, we focus our analysis on when the overtaking of vehicles is permitted. A new family of link travel time functions is presented, which allows us to reproduce the same asymptotic congestion behavior of several overtaking classes to mimi...
Article
In this paper, we deal with the observability problem in traffic networks and the optimal location of counting and scanning devices. After explaining what we mean by observability, the problems of what to observe, how to observe traffic data and how to incorporate prior or obsolete information together with the cases of genuine and pseudo-samples o...
Article
A stochastic demand dynamic traffic model is presented to predict some traffic variables, such as link travel times, link flows, or link densities, and their time evolution in real networks. The model considers that the variables are generalized beta variables such that when they are marginally transformed to standard normal, they become multivaria...
Article
This paper presents a first-in–first-out (FIFO) rule consistent model for the continuous dynamic network loading problem. The model calculates the link travel time functions at a basic finite set of equally spaced times that are used to interpolate a monotone spline for all the other times. The model assumes a nonlinear link travel time function of...
Article
Full-text available
The criteria currently employed for the design of railway infrastructure on ballasted track are based on the elements of the superstructure, traffic, and bearing capacity of the subgrade. In high-speed railway, the elements of the superstructure are relatively well defined because they are based on existing experience. The category of traffic is a...
Article
This paper deals with the error recovery problem when scanned license plate data are used to predict traffic flows. The aim is to reduce the effects of errors owing to lost plates or mistaken transcription, to improve estimation results. To this end, a method is given and discussed for traffic flow prediction using plate scanning data and taking in...
Article
We deal with the problem of observability of a given subset V<sub>1</sub> of flows in terms of another subset V<sub>2</sub>, no matter which type of flows [link, origin-destination (OD), route, node, plate scanned, etc.] they contain or whether they are mixed types. Two problems are stated: The first consists of determining which subsets of flows i...
Article
During the last decade, there has been a substantial interest in how to determine the optimal number and locations of traffic counters for origin-destination (OD) trip matrices estimation. On the contrary, the optimal allocation of plate scanning devices has received very limited attention, even though several authors have demonstrated that plate s...
Conference Paper
This article deals with the problem of observability of traffic networks, understanding as such the problem of identifying if a set of available flow measurements is sufficient to estimate the remaining flows in the network, OD-pair or link flows. An algebraic method for solving the observability problems is given. Specifically, a step by step proc...
Conference Paper
This paper deals with the problem of predicting route flows (and hence, Origin-Destination (OD) pair and link flows) and updating these predictions when plate scanned information becomes available. To this end, a normal Bayesian network is built which is able to deal with the joint distribution of route and link flows and the flows associated with...
Article
This paper deals with the problem of predicting traffic flows and updating these predictions when information about OD pairs and/or link flows becomes available. To this end, a Bayesian network is built which is able to take into account the random character of the level of total mean flow and the variability of OD pair flows, together with the ran...
Article
This article deals with the problem of estimating and updating the origin-destination matrix and link flows from traffic counts and its optimal location. A combination (bi-level) of an OD-pair matrix estimation model based on Bayesian networks, and a Wardrop-minimum-variance model, which identifies origins and destinations of link flows, is used to...

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