Enrique Hernández-Montes

Enrique Hernández-Montes
University of Granada | UGR · Department of Civil Engineering

Professor
School of Civil Engineers of the University of Granada

About

141
Publications
33,950
Reads
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1,230
Citations
Introduction
I am interested in many things, from Structural Engineering in a broad sense (Earthquake, concrete, steel, form-finding problems, ...) to history of construction, ethics, ... I am even more interested in my children, in Luisamaría, my students, friends, .... Some of my major professional accomplishments are: Energy based pushover analysis (FEMA440) Nonsymmetrical pile system -patented- (Ryad Metro, ...) Topological mapping of pin-jointed structures My classes of reinforced concrete -see youtube
Additional affiliations
January 2002 - January 2003
University of Illinois, Urbana-Champaign
Position
  • Researcher
January 1993 - present
University of Granada
Position
  • Professor (Full)

Publications

Publications (141)
Article
Full-text available
Santa Pudia calcarenite was one of the most commonly used building materials in the construction of historical buildings in the city of Granada (Spain). As a result, Santa Pudia calcarenite has been mainly studied from a petrographical point of view in previous works. In this work, the mechanical properties of Santa Pudia calcarenite are studied. T...
Article
A tensegrity family is a group of tensegrity structures that share a common connectivity pattern. The Octahedron, the Z-Octahedron, and the X-Octahedron families are examples of these groups found in the literature. In this work, a new graphical representation of the members of the Z-Octahedron family based on octagonal cells is presented. These ne...
Article
Rammed earth is attracting renewed interest due to its sustainability. In this work, a mechanical characterization of unstabilized rammed earth is presented. Compressive strength, Young's modulus, and Poisson's ratio were determined, with the first of these being the most representative mechanical property of rammed earth. Stress – strain curves we...
Article
Tensegrity structures have developed greatly in recent years due to their unique mechanical and mathematical properties. In this work, the topology of the Octahedron family is presented. New tensegrity structures that belong to this family are defined based on their topology. As an example, the eleven-time-expanded octahedron is shown, a super-stab...
Article
The deterioration of built heritage is a major concern for many countries. In the specific case of brick heritage buildings, degradation depends on several factors such as the chemical and mineralogical composition and the porosity of the bricks, floor insulation and exposure to environmental conditions. This paper applies a probabilistic Bayesian...
Article
This paper presents the results of the assessment of the dynamic characteristics and vibration performance of eight deteriorating footbridges. The bridges examined, part of the public infrastructure of the city of Tunja (Colombia), present an evident state of deterioration, showing excessive vibration under service loadings. A consistent evaluation...
Preprint
A new methodological concept is presented for seismic design, called Yield Displacement Charts (YDC). As with its predecessors, the Yield Point Spectra (YPS) and the Yield Frequency Spectra (YFS), the YDC takes advantage of the simple features of yield displacement (uy), to use uy in a performance-based design versus a force-based period-dependent...
Article
Full-text available
This paper reports on a series of shaking table tests on a full-scale flat-bottom steel silo filled with soft wheat, characterized by aspect ratio of around 0.9. The specimen was a 3.64-m diameter and 5.50-m high corrugated-wall cylindrical silo. Multiple sensors were used to monitor the static and dynamic response of the filled silo system, includ...
Article
Full-text available
This article is a survey discussing the application of fiber-reinforced polymer composites in freeform structures and their impact on the design and shape generation process. The analysis of case studies showed that the use of FRP composites not only helps to overcome some challenges in the construction of objects with complex geometry, but also cr...
Article
A piece of historical research about the construction of the ancient Arch of Taq-iKisra, part of the imperial palace of the Sasanian Empire in the city of Ctesiphon, has been carried out. The information obtained, an analysis using graphic statics, the use of a physical model with hanging chains, and an ad hoc optimization program written in MATLAB...
Chapter
Through this research it is intended to catalogue different environmental scenarios taking into account extreme climatic actions and what is their mechanical, chemical and physical impact on the main materials used in construction (reinforced concrete, bricks, lime repair mortars, etc.). For this, a qualification of these material deterioration pro...
Article
This paper presents a new general methodology to obtain an approximate analytical expression of the Saint-Venant's torsion. The shear stress in each of the principal Cartesian directions is obtained by the derivation of the stress function, whose analytical expression is obtained from the Prandtl analogy. The proposed methodology uses two variables...
Article
This technical note introduces a new graphical representation which allows the visualization of the energy balance of a structure subjected to dynamic loading using hysteretic curves. Hysteretic curves were originally created to describe the behavior of magnetic materials. They were later introduced into structural engineering to describe the behav...
Article
The repair and rehabilitation of Reinforced Concrete (RC) structures affected by the corrosion of their reinforcement is a complex task. The estimation of the residual structural capacity of corroded RC structures is becoming a crucial factor in the decision-making process of repair or demolition. Many researchers have studied the effects of reinfo...
Article
A new family of tensegrity structures is presented: the Z-octahedron family. A tensegrity family is a group of tensegrity structures that share a common connectivity pattern. The members of the Z-octahedron family have been obtained replacing the elementary rhombic cells of the members of the octahedron family with elementary Z-shaped cells. In add...
Article
The deterioration of the built heritage is becoming a pressing issue in many countries. The assessment of such a degradation at large (building) scale is key for maintenance priorisation and decision making. This paper proposes a straightforward yet rigorous method to asses and predict the surface recession in heritage buildings. The method is base...
Article
Full-text available
A tensegrity family is a group of tensegrity structures that share a common connectivity pattern. The three first members of the Octahedron family are the octahedron, the expanded octahedron and the double-expanded octahedron. In this work a new family is presented: the X-Octahedron family. If in the elementary rhombic cells of the Octahedron famil...
Article
El uso de grupos (o paquetes) de barras presenta ventajas tales como la descongestión de barras. Sin embargo, el empalme de este tipo de barras requiere de mayor detalle tanto en el despiece como en la ejecución. El empalme más habitual en este tipo de barras es el empalme por solape (o traslapo), escalonando las barras individuales en la dirección...
Article
La parte 1-1 del Eurocódigo 3 es aplicable a piezas compuestas formadas por cordones idénticos unidos con dos planos de enlace. Este artículo propone una corrección en la formulación propuesta por el Eurocódigo 3 para el límite superior de la rigidez a cortante en piezas compuestas empresilladas. El límite superior se suele usar en el predimensiona...
Conference Paper
Full-text available
We introduce a research framework for downscaling the predicted/simulated climate and atmospheric conditions as well as associated risk maps down to the 1x1 km (historic area) scale, merging them with geohazard maps and integrating them with site and structure specific multi-hazard vulnerability functions to determine the time-varying risk for hist...
Article
Full-text available
The use of Sectorial coordinates is unavoidable when studying thin-walled elements with open cross sections. The torsional behavior of this type of elements is governed by some fundamental sectorial properties such as the position of the principal pole, i.e., the shear center, and the warping constant or sectorial moment of inertia. However, and de...
Article
A simpler and a more general formulation of the component method (CM) proposed by the European Standard of Steel Structures is presented in this work. There are two main differences from the methodology proposed in Eurocode 3-Part 1–8: first) the moment-rotation curve is obtained from the moment and axial equilibrium equations using only the transl...
Article
There are three possible modes of buckling of thin-walled straight steel columns: flexural buckling, torsional buckling, and flexural-torsional buckling. These modes of buckling are considered in the specification for the design of steel structures, such as Eurocode 3, which includes the particular case of torsional-flexural buckling of centrically...
Article
A method is presented for the design of unbonded post-tensioned concrete walls for seismic loading to satisfy multiple performance objectives. It takes advantage of the fact that the initial stiffness of the wall is nearly independent of the amount of post-tensioning reinforcement, and thus the fundamental period of the building can be considered t...
Article
Compression-only structures such as domes and vaults can be modelled as pin-jointed networks whose equili- brium configuration is obtained using well-known form-findings methods such as the Force Density Method. As all the members of the network are in compression, its corresponding force density or force:length ratio matrix is non-singular and the...
Article
The introduction of polymers in ordinary cement concrete in order to reduce the Portland cement consumption is gaining more attraction in the field of civil engineering. However, in order to promote the use of Polymer-Modified Concrete (PMC) in real works, in addition to the mechanical characterization of the material, the study of its structural b...
Article
The octahedron family of tensegrity structures is presented in this research. The octahedron and the expanded octahedron (well-known tensegrities in the literature) are the first and second components of the family. A new tensegrity is presented: the double-expanded octahedron. This new tensegrity form was obtained following the connectivity patter...
Technical Report
Full-text available
The numeric computation procedure for the solution of the equation of motion of a single-degree-of-freedom (SDOF) system subjected to any type of ground acceleration is exhaustively presented. The followed numeric approach is the Linear Acceleration Method, i.e. Newmark's Method with and. The approach allows considering any time of multilinear elas...
Article
Longitudinal reinforcement anchored using heads is becoming more common because it avoids congestion of bars and improves the durability of the anchorage. This paper tries to facilitate its use showing that the specification of the applicability limits is not needed. This work studies the application domains of the different failure modes of the an...
Article
This paper presents a compact formulation of a new method for the design of RC slabs to ultimate state of shear, bending and torsion that overcomes the lack of strain compatibility substantiation presented by previous methods used in the available software. This new approach provides designs which behave closer to experiments than the previous ones...
Article
Full-text available
Strut and Tie (S&T) models are used for the design of what are known as “discontinuity regions” in reinforced concrete (RC) structures. Building codes such as ACI-318 and Eurocode 2 do not give information on the nodes that only connect ties in S&T models (called TTT or tension-only nodes). However, their use is not explicitly prohibited in the des...
Article
In this research, the compressive behavior of concrete mixtures incorporating epoxy resin with and without hardener and ground rubber (tyre powder) as cement replacement was investigated. Various experimental mixes were produced varying the polymer/cement mass ratio. A general design criteria was adopted in the design of the mixtures in order to ha...
Article
A procedure for the performance-based seismic design of moment-resistant frames is presented. The design procedure utilizes an estimate of the yield displacement of the roof in conjunction with yield point spectra to determine the required lateral strength. Beam strengths are established using a plastic mechanism approach, while a modified Portal F...
Article
Domes and vaults, with or without inner ribs, can be modelled as pin-jointed networks with all their members in compression. The Force Density Method is one of the most widely used form-finding meth- ods for the computation of the equilibrium shape of pin-jointed networks. Mapping in topology, in con- trast with other mapping methods, does not need...
Article
Full-text available
A formula to estimate the yield displacement observed in the pushover analysis of coupled wall lateral force-resisting systems is presented. The estimate is based on the results of an analytical study of coupled walls ranging from 8 to 20 stories in height, with varied amounts of reinforcement in the reinforced concrete coupling beams and walls, su...
Article
The physical form of the ancient arch of Taq-iKisra is studied. A structural analysis is developed considering its unusual geometry. In addition, a physical model using hanging chains to represent the uneven distribution of weight was built. Due to the particular geometry of the arch, it is concluded that the designer-builders of this 6th Century a...
Article
The main cause of the deterioration of concrete structures is the corrosion of their reinforcement. The use of galvanized steel rebars is a competitive solution to increase the service life of structures. The bond of galvanized rebars with concrete has been studied in recent years, but some of the results of different research on bond capacity are...
Article
This piece of work presents a simple and compact overview of the design problem of tensegrity structures in two and three dimensions. The main aim of this study is to present the design and calculation of tensegrity structures in their simplest form, avoiding unnecessary simplifications that can rule out solutions, as has happened up until now. As...
Article
Reinforced concrete piles employed in earth retaining systems are typically designed with symmetric reinforcement. The non-symmetric RC wall piles have recently been introduced by the authors, obtaining savings of up to 50% in weight in longitudinal reinforcing steel compared with the traditional solutions, leading to significant financial savings...
Article
The expression stiffness matrices used in the study of tensegrity structures has inherited a formulation initially conceived for the shape finding problems of tension structures. Nevertheless stiffness and geometrical stiffness matrices are well known concepts of structural analysis and all the formulations which are used need to be congruent. In t...
Article
This paper studies the behavior of two RC slabs subjected to bending and torsion, presenting deformation with positive gauss curvature. Special attention is paid to the available methods for the strength design of RC slabs, and to the verification of the assumptions used in these methodologies. Ultimate behavior according to two strength design met...
Article
The estimation of the residual capacity of concrete structures after the commencement of corrosion of steel reinforcement is becoming a goal for repair and rehabilitation work. This paper presents a procedure for the assessment of the residual structural capacity of corrosion-affected RC members due to bond deterioration and reduction of the cross-...
Article
A coupled system consisting on a heliostat and a matrix of light-pipes inside one road tunnel where the heliostat injects sunlight, is proposed. Its reliability and efficiency from theoretical calculations and a mock-up, is analyzed as a function of tunnel orientation. The heliostat is fixed above the road some meters before the portal gate of the...
Article
Full-text available
Force density method together with topological mapping has been employed to perform the form-finding process of tension structures. Compression-only structures such as domes and vaults can be modelled if the former approach is modified. This modification consists of iteratively introducing the self-weight of the structure to be modelled until the e...
Article
Full-text available
An arch is a structural element that aims to reduce flexural moments while also spanning an open space. For this reason, the shapes of loaded arches have always attracted scientists and engineers. The analytical expression of a loaded arch under different loading conditions advances knowledge and precision. This paper presents the analytical expres...
Article
Optimized non-symmetrically reinforced piles for retaining walls constitute a new structural element recently used in constructions such as the underground floors of San Antoni Market in Barcelona or in the Riyadh metro. Piles usually have circular cross sections with longitudinal reinforcement composed of bars of the same diameter and with constan...
Article
The equation of motion for the response of SDOF systems is presented in terms of energy for a general class of hysteretic relationships that include stiffness degrading inelastic and bilinear elastic behavior, for systems subjected to earthquake ground motions in the presence or absence of P-delta effects. The evaluation of expended energy is prese...
Article
This paper describes a new methodology for solving a typical problem in the design of antifunicular structures: how a equilibrium configuration can be obtained with initial geometrical constraints. In the seventies the Force Density Method -FDM- was introduced for the research of an equilibrium position. This method is nowadays being used successfu...
Article
The asymmetric arrangement of reinforcement in concrete pile members employed as retaining earth systems has recently been introduced. The study of the behavior of those members under service loads requires the study of tension stiffening in circular cross sections under flexure. In order to apply tension stiffening, an effective area of concrete i...
Conference Paper
Full-text available
The asymmetric reinforcement in concrete pile members employed as retaining earth systems has recently been introduced. The use of non-symmetrical piles supposes savings up to 50% in weight of longitudinal reinforcing steel, compared with the traditional symmetrical piles. The behaviour of those new members under service both in short and long term...
Article
The building of more sustainable structures is becoming a mandatory requirement. Different alternative are followed, as the use of blended cements to diminish the CO2 emissions and energy saving, as of new reinforcement, as hot-dip galvanized, to increase the service life of reinforced concrete structures. But the effects of these changes on the te...
Article
Results of tests of plastered straw bale wall assemblies under in-plane shear and axial load are used together with proposed refinements to compression field theories for reinforced concrete members to predict ultimate shear strengths of plastered straw bale walls. Two parameters of the so-called “refined compression-field theory” are calibrated fo...
Article
The necessity of saving energy from the electrical lighting in road tunnels demands alternative solutions, especially concerning the use of the cheapest and most ecological light source: the sun. In this work, the principles of sunlight distribution inside the tunnels themselves by means of light-pipes are developed and considered. The study is bas...
Article
The strength design of reinforced concrete (RC) rectangular sections for combined compression and in-plane bending with two levels of reinforcement is indeterminate: three unknowns are to be solved, but with only two equilibrium equations; an additional condition is necessary to solve the problem. The additional condition leads to the finding of a...
Article
In order to reduce the CO2 emission engineers and architects must optimize the use of materials, particularly steel, making an optimal use of it. It is possible to guarantee the strength of the structural element reducing the amount of steel locating it properly at the cross-section and introducing a higher control level at construction site.