Iván M. Díaz
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View article: Long-Term Dynamic Monitoring of Post-Tensioning External Tendons: Temperature Effect Evaluation
Long-Term Dynamic Monitoring of Post-Tensioning External Tendons: Temperature Effect Evaluation Open
Cables and tendons are crucial elements in bridge engineering but also are vulnerable structural elements because they are usually subjected to fatigue and corrosion problems. Thus, vibration-based non-destructive techniques have been used…
View article: Design and Implementation of a MIMO Integral Resonant Control for Active Vibration Control of Pedestrian Structures
Design and Implementation of a MIMO Integral Resonant Control for Active Vibration Control of Pedestrian Structures Open
In contemporary construction, the prevalence of vibration serviceability issues in lightweight and slender structures has become increasingly common, owing to advancements in building materials and construction methods. While these structu…
View article: Lightweight footbridges subjected to streams of pedestrians: tests and discussion of a crowd-structure interaction model
Lightweight footbridges subjected to streams of pedestrians: tests and discussion of a crowd-structure interaction model Open
Human-induced vibrations in slender lightweight footbridges have been extensively investigated in the last 30 years. In existing guidelines, the dynamic response of a footbridge can be assessed considering the pedestrians as external non-i…
View article: Application of dynamics inversion techniques to the force control of electrodynamic actuators used for active vibration absorption
Application of dynamics inversion techniques to the force control of electrodynamic actuators used for active vibration absorption Open
The active vibration absorber has been successfully used, both in laboratory and actual facilities, to mitigate the human-induced vibrations taking place in lively, low-damping structures such as long-span floors or pedestrian footbridges.…
View article: Design and Implementation of a MIMO Integral Resonant Control for Active Vibration Control of Pedestrian Structures
Design and Implementation of a MIMO Integral Resonant Control for Active Vibration Control of Pedestrian Structures Open
In contemporary construction, the prevalence of vibration serviceability issues in lightweight and slender structures has become increasingly common, owing to advancements in building materials and construction methods. While these structu…
View article: Structural Optimization of Lightweight Composite Floors with Integrated Constrained Layer Damping for Vibration Control
Structural Optimization of Lightweight Composite Floors with Integrated Constrained Layer Damping for Vibration Control Open
Due to current architectural trends, contemporary public buildings are becoming open-plan spaces with much less weight and damping. Consequently, Vibration Serviceability Limit State (VSLS) due to human-induced vibrations has become an inc…
View article: A frequency-domain approach to model vertical crowd-structure interaction in lightweight footbridges
A frequency-domain approach to model vertical crowd-structure interaction in lightweight footbridges Open
Load models that account for Human-Structure Interaction (HSI) may be preferable to accurately predict the dynamic response of lightweight footbridges subjected to pedestrian actions. Representing each person within a crowd may not be prac…
View article: Design of a Semiactive TMD for Lightweight Pedestrian Structures Considering Human–Structure–Actuator Interaction
Design of a Semiactive TMD for Lightweight Pedestrian Structures Considering Human–Structure–Actuator Interaction Open
Lightweight pedestrian structures constructed with high strength-to-weight ratio materials, such as fiber-reinforced polymers (FRP), may experience large accelerations due to their lightness, thus overcoming the serviceability limit state.…
View article: A common framework for the robust design of tuned mass damper techniques to mitigate pedestrian-induced vibrations in lively footbridges
A common framework for the robust design of tuned mass damper techniques to mitigate pedestrian-induced vibrations in lively footbridges Open
The dynamic response of modern slender footbridges is usually sensitive to both the pedestrian actions and the uncertainties associated with their inherent structural behavior. Thus, tuned mass dampers have been widely integrated in the de…
View article: Identification of a Human-Structure Interaction Model on an Ultra-Lightweight FRP Footbridge
Identification of a Human-Structure Interaction Model on an Ultra-Lightweight FRP Footbridge Open
Due to the high strength-to-weight ratio of fibre reinforced polymers (FRPs), human-induced vibration problematic remains as a subject to be fully comprehended in order to extend the use of composites in Bridge Engineering. Thus, this pape…
View article: Uncertainty-based approaches for the lateral vibration serviceability assessment of slender footbridges
Uncertainty-based approaches for the lateral vibration serviceability assessment of slender footbridges Open
Slender footbridges with long spans and light materials may lead to serviceability problems in lateral vibrations due to walking pedestrians. The phenomenon, known as the "lock-in effect" occurs when the number of pedestrians on the footbr…
View article: Interaction Phenomena to Be Accounted for Human-Induced Vibration Control of Lightweight Structures
Interaction Phenomena to Be Accounted for Human-Induced Vibration Control of Lightweight Structures Open
Inertial mass controllers, including passive, semi-active and active strategies, have been extensively used for canceling human-induced vibrations in lightweight pedestrian structures. Codes to check the vibration serviceability and curren…
View article: Passive and active vibration isolation under isolator-structure interaction: application to vertical excitations
Passive and active vibration isolation under isolator-structure interaction: application to vertical excitations Open
This work studies the influence of a vibration isolator on the response of a flexible base structure. Two strategies are compared: passive and active vibration isolation (PVI, AVI). Although the multiple advantages of AVI over PVI techniqu…
View article: A Shake Table Frequency-Time Control Method Based on Inverse Model Identification and Servoactuator Feedback-Linearization
A Shake Table Frequency-Time Control Method Based on Inverse Model Identification and Servoactuator Feedback-Linearization Open
Shake tables are one of the most widespread means to perform vibration testing due to their ability to capture structural dynamic behavior. The shake table acceleration control problem represents a challenging task due to the inherent non-…
View article: Enhancing Friction Pendulum Isolation Systems Using Passive and Semi-Active Dampers
Enhancing Friction Pendulum Isolation Systems Using Passive and Semi-Active Dampers Open
Friction pendulum systems (FPSs) are a common solution for isolating civil engineering structures under ground movements. The result is a base-isolated structure in which the base exhibits low shear stiffness in such a way that the input e…
View article: Motion-Based Design of Passive Damping Systems to Reduce Wind-Induced Vibrations of Stay Cables under Uncertainty Conditions
Motion-Based Design of Passive Damping Systems to Reduce Wind-Induced Vibrations of Stay Cables under Uncertainty Conditions Open
Stay cables exhibit both great slenderness and low damping, which make them sensitive to resonant phenomena induced by the dynamic character of external actions. Furthermore, for these same reasons, their modal properties may vary signific…
View article: Assessment of the Lateral Vibration Serviceability Limit State of Slender Footbridges Including the Postlock-in Behaviour
Assessment of the Lateral Vibration Serviceability Limit State of Slender Footbridges Including the Postlock-in Behaviour Open
The lateral vibration serviceability of slender footbridges has been the subject of many studies over the last few decades. However, in spite of the large amount of research, a common criterion has not been set yet. Although the human–stru…
View article: Further steps towards the tuning of inertial controllers for broadband‐frequency‐varying structures
Further steps towards the tuning of inertial controllers for broadband‐frequency‐varying structures Open
There is a large number of slender structures which are prone to vibrate due to pedestrian loads. The well-known Tuned Mass Damper (TMD) is increasingly used in practice, but this device may detune under several circumstances drastically r…
View article: Interactive lecture notes for structural dynamic analysis in frequency domain = Apuntes de clase interactivos para el análisis de la dinámica estructural en el dominio de la frecuencia
Interactive lecture notes for structural dynamic analysis in frequency domain = Apuntes de clase interactivos para el análisis de la dinámica estructural en el dominio de la frecuencia Open
Dynamic and experimental analysis of structures are two of the most abstract and complex disciplines in structural engineering, because of its awkward mathematical and physical background and due to the multidisciplinary knowledge needed t…
View article: Analysis of interfacial interaction in UHPFRC-strengthened reinforced concrete beams
Analysis of interfacial interaction in UHPFRC-strengthened reinforced concrete beams Open
The behaviour and failure mode of reinforced concrete elements strengthened with a thin tensile layer of ultra-high performance fiber-reinforced concrete (UHPFRC) is governed by the interface interaction between the UHPFRC and conventional…
View article: Laboratory dynamic structural testing. Methods and applications
Laboratory dynamic structural testing. Methods and applications Open
Regardless of the advances in simulation power of computers and material constitutive models, there is an agreement with the need of structural experimental testing. In particular, great effort has been made to understand the performance o…
View article: DynApp: a mobile application for vibration serviceability assesment
DynApp: a mobile application for vibration serviceability assesment Open
Human loading may induce significant vibrations in some types of structures such as long-span floor slabs or light-weight pedestrian bridges, affecting their vibration serviceability limit state. In many cases, this limit state is not take…
View article: Study of active vibration isolation systems considering isolator – structure interaction
Study of active vibration isolation systems considering isolator – structure interaction Open
Many technological applications require precise alignment between different devices to their correct development. The unwanted vibrations transmitted through the support to the payload can produce misalignment and this may entail high cost…
View article: Modelling of highly-damped composite floor beams with constrained elastomer layers
Modelling of highly-damped composite floor beams with constrained elastomer layers Open
Floor vibrations caused by human activities is an issue to consider mainly caused by new construction tendencies towards longer, lighter and less damped composite floor systems. Furthermore, the removal of full height partitions and heavy …
View article: A methodology to design inertial mass controllers for human-induced vibrations
A methodology to design inertial mass controllers for human-induced vibrations Open
The authors have demonstrated that human-induced vibration can be controlled with passive, active and semi active inertial controllers working as a single-input single-output or multi-input multi output configuration. This paper describes …
View article: Numerical and experimental lateral vibration assessment of an in-service footbridge
Numerical and experimental lateral vibration assessment of an in-service footbridge Open
This paper describes the experimental and numerical lateral vibration assessment of La Paz footbridge (LPF) as part of a research project of pedestrian structures located in Madrid. LPF is a cable-stayed structure with main span of 85m and…
View article: Assessment of Lateral Vibrations of Footbridges Using a Frequency Domain Approach
Assessment of Lateral Vibrations of Footbridges Using a Frequency Domain Approach Open
Lateral vibrations of footbridges caused by the passage of pedestrian crowds have been the object of many studies over the last decade. However, the connection between experimental and analytical results remains tenuous and as a consequenc…