David Escolano-Margarit

Universidad Politécnica de Madrid | UPM · Departamento de Ingeniería Mecánica y de Fabricación

In the energy-based approach the effect of the earthquake on the structures is characterized in terms of an energy input and a its proper estimation is of key importance. This energy input, EI, flows into the structure and is partially dissipated through the inherent mechanism of damping of the structure, Wξ, and the rest (EI −Wξ) is what Housner d...

Esta patente de invención con examen (ES 2 920 158 B2) se encuadra en el campo de los dispositivos disipadores de energía para el control pasivo de las vibraciones en estructuras y en equipos industriales en general, provocadas por cualquier acción como, por ejemplo, terremotos o viento. Ello incluye, sin limitarse, a las vibraciones que se transmi...

This paper presents a new hybrid energy dissipation device and investigates experimentally its capability to improve the seismic response of an inherently very flexible structural system: a reinforced concrete waffle‐flat plate structure. The new device combines in parallel within a single device a low‐cost viscoelastic (VE) component and a metalli...

Resumen La estrategia convencional de proyecto sismorresistente actual permite que frente a sismos severos las estructuras plastifiquen y sufran daños importantes pero sin colapsar. Esta estrategia esta siendo fuertemente cuestionada por los enormes daños materiales que involucra y su fuerte impacto medioambiental. Desde principios del siglo XXI se...

New technologies such as the structures with energy dissipation systems have proven to be a very effective solution to attain the objectives of Performance Based Design. These energy dissipation devices are responsible of absorbing most of the energy input exerted by the earthquake, preventing any plastic deformation on main structural components....

This article proposes a new constitutive model for the cyclic behavior of rubberized concrete confined with fiber‐reinforced polymer (FRP) sheets. The model is calibrated with experimental results from 18 confined rubberized concrete (CRuC) cylinders tested in cyclic compression. The cylinders had 60% total aggregate volume replacement with recycle...

Traditional vulnerability methodologies rely on collecting building data through time consuming surveys and visual screening. Geospatial infrastructure systems have rapidly evolved and today we can access massive geospatial data. Digital cadastral databases combine location, attributes, and temporal information for building stock. This paper propos...

The efficiency of visual grading standards applied to structural timber is often inappropriate, and timber properties are either under or over-graded. Although not included in the current UNE 56544 visual grading standard, machine learning algorithms represent a promising alternative to grade structural timber. The general aim of this research was...

Knowing the (ultimate) energy dissipation capacity of structural members is a key aspect of seismic design based on the energy-balance, since it is the main parameter for verification. The gap in knowledge about the energy dissipation capacity of structural members is considerable, particularly for reinforced concrete (RC) structural elements. In t...

Reinforced concrete (RC) frame structures with open first stories and masonry infill walls at the upper stories are very common in seismic areas. Under strong earthquakes, most of the energy dissipation demand imposed by the earthquake concentrates in the first story, and this eventually leads the building to collapse. A very efficient and cost-eff...

This paper proposes a new metallic damper based on the plastic deformation of mild steel. It is intended to function as an energy dissipation device in structures subjected to severe or extreme earthquakes. The damper possesses a gap mechanism that prevents high-cycle fatigue damage under wind loads. Furthermore, subjected to large deformations, th...

Friction-based dampers are considered as one of the most efficient Energy Dissipation Devices (EDDs) due to their advantages such as adjustability and high energy dissipation capacity. However, their efficiency is strongly associated with the design slip load values along the structure. Conventional design methods using uniform slip load distributi...

The efficacy of hysteretic dampers can be formulated as the number or equivalent inelastic cycles, or the ratio of normalised dissipated energy to displacement ductility. This parameter is used in the design of framed structures with supplemental dampers and it is strongly influenced by the impulsive effects of earthquakes and other structural para...

This paper investigates a new stainless-steel tube-in-tube damper (SS-TTD) designed for the passive control of structures subjected to seismic loadings. It consists of two tubes assembled in a telescopic configuration. A series of slits are cut on the walls of the exterior tube in order to create a series of strips with a large height-to-width rati...

Proyecto de innovación educativa concedido en la convocatoria 2019 de "ayudas a la innovación educativa y a la mejora de la calidad de la enseñanza" coordinada por gerencia y PDI de la UPM.

This article develops an analysis-oriented stress-strain model for rubberized concrete (RuC) passively confined with fiber-reinforced polymer (FRP) composites. The model was calibrated using highly instrumented experiments on 38 cylinders with high rubber content (60% replacement of the total aggregate volume) tested under uniaxial compression. Par...

Shape memory alloys in the form of bars are increasingly used to control structures under seismic loadings. This study investigates the hysteretic behavior and the ultimate energy dissipation capacity of large-diameter NiTi bars subjected to low- and high-cycle fatigue. Several specimens are subjected to quasi-static and to dynamic cyclic loading a...

This article develops an analysis-oriented stress-strain model for rubberized concrete (RuC) passively confined with fiber reinforced polymer (FRP) composites. The model was calibrated using highly instrumented experiments on 38 cylinders with high rubber contents (60% replacement of the total aggregate volume) tested under uniaxial compression. Pa...

Energy Dissipation Devices (EDDs) have been widely used for seismic design and strengthening of both new and existing buildings. With designated supplementary EDDs installed in a structure, a considerable portion of the input seismic energy can be dissipated and the damage imparted to the framing system is reduced. However, the energy dissipation o...

This article investigates the use of externally bonded Fibre Reinforced Polymer (FRP) jackets to develop a novel high-strength, highly-deformable FRP Confined Rubberised Concrete (CRuC). Sixty rubberised concrete (RuC) cylinders were tested in axial compression. The cylinders were produced using recycled tyre rubber to replace i) 0–100% fine or coa...

Six large-scale reinforced concrete structural walls were subjected to increasing displacement reversals up to failure. The effects of lap splices, splice length (60 bar diameters and 40 bar diameters), and boundary-element confinement were studied. The aspect ratio of the test walls was 2.2. Although no lap-splice failures occurred, the lap splice...

Reinforced concrete (RC) coupled shear walls are commonly used in the design and construction of high rise buildings located in seismic zones to control drifts at upper storeys. When appropriate degree of coupling is provided, the overall seismic overturning moment is resisted by two mechanisms: i) bending at the base of each wall, and ii) moment o...

This paper presents the experimental results obtained by applying frequency-domain structural health monitoring techniques to assess the damage suffered on a special type of damper called Web Plastifying Damper (WPD). The WPD is a hysteretic type energy dissipator recently developed for the passive control of structures subjected to earthquakes. It...

Passive energy dissipation devices are increasingly implemented in frame structures to improve their performance under seismic loading. Most guidelines for designing this type of system retain the requirements applicable to frames without dampers, and this hinders taking full advantage of the benefits of implementing dampers. Further, assessing the...

This paper discusses the torsional response of a scaled reinforced concrete frame structure subjected to several uniaxial shaking table tests. The tested structure is nominally symmetric in the direction of shaking and exhibits torsion attributable to non-uniform yielding of structural components and uncertainties in the building process. Asymmetri...

This paper presents shake-table tests conducted on a two-fifths-scale reinforced concrete frame representing a conventional construction design under current building code provisions in the Mediterranean area. The structure was subjected to a sequence of dynamic tests including free vibrations and four seismic simulations in which a historical grou...

The use of seismic hysteretic dampers for passive control is increasing exponentially in recent years for both new and existing buildings. In order to utilize hysteretic dampers within a structural system, it is of paramount importance to have simplified design procedures based upon knowledge gained from theoretical studies and validated with exper...

This paper provides partial results of an on-going research aimed at investigating the seismic response of reinforced concrete (RC) frames equipped with hysteretic-type energy dissipating devices (EDD). From a prototype RC frame structure designed only for gravity loads, a test model scaled in geometry to 2/5 was defined and built in the Laboratory...

This paper presents the results of cyclic loading tests on two large-scale reinforced concrete structural walls conducted at Purdue University. One of the walls had confinement reinforcement meeting ACI-318-11 requirements while the other wall did not have any confinement reinforcement. The walls were tested as part of a larger study aimed at devel...

: This research investigates the ultimate earthquake resistance of typical RC moment resisting frames designed accordingly to current standards, in terms of ultimate energy absorption/dissipation capacity. Shake table test of a 2/5 scale model, under several intensities of ground motion, are carried out. The loading effect of the earthquake is expr...