Export 47 results:
Sort by: Author Title [ Type  (Desc)] Year
Faseamento Construtivo de Pontes de Tirantes com Pequenos e Medios Vãos. Instituto Superior Técnico da Universidade Técnica de Lisboa. Lisboa, 2004.
Amarante dos Santos, F. P. Structural Control with Shape-Memory Alloys. Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa. Lisboa, 2011.
Journal Article
Amarante dos Santos, Filipe. " Buckling control using shape-memory alloy cables ." Journal of Engineering Mechanics (2015).
Amarante dos Santos, Filipe, Corneliu Cismasiu, and Chiara Bedon. " Smart glazed cable façade subjected to a blast loading ." Structures & Buildings (2015).
Amarante dos Santos, Filipe, Chiara Bedon, and Mariana Sacadura. "Adaptive Glass Panels using Shape-Memory Alloys." Glass Structures & Engineering. 1.1 (2016): pp 95-114.
Amarante dos Santos, Filipe, and Corneliu Cismasiu. "Adaptive underslung beam using shape-memory alloys for frequency-tunning." Journal of Intelligent Material Systems and Structures (2016).
Amarante dos Santos, F. P., and C. Cismaşiu. "Comparison Between Two SMA Constitutive Models for Seismic Applications." Journal of Vibration and Control. 16.6 (2010): 897-914 . AbstractWebsite

This paper analyses and compares the dynamic behavior of superelastic shape memory alloy (SMA) systems based on two different constitutive models. The first model, although being able to describe the response of the material to complex uniaxial loading histories, is temperature and rate independent. The second model couples the mechanical and kinetic laws of the material with a balance equation considering the thermal effects. After numerical validation and calibration, the behavior of these two models is tested in single degree of freedom dynamic systems, with SMAs acting as restoring elements. Different dynamic loads are considered, including artificially generated seismic actions, in a numerical model of a railway viaduct. Finally, it is shown that, in spite of its simplicity, the temperature- and rate-independent model produces a set of very satisfying results. This, together with its robustness and straightforward computational implementation, yields a very appealing numerical tool to simulate superelastic passive control applications.

Amarante dos Santos, Filipe, Corneliu Cismasiu, and Francisco Braz Fernandes. "Cyclic Instability of Shape-Memory Alloys in Seismic Isolation Systems." International Journal of Structural Glass and Advanced Materials Research . DOI: 10.3844/sgamrsp.2018. (2018).
Amarante dos Santos, Filipe, André Rodrigues, and Andrea Micheletti. "Design and experimental testing of an adaptive shape-morphing tensegrity structure, with frequency self-tuning capabilities, using shape-memory alloys." Smart Materials and Structures. 24(105008) (2015).
Santos, F., C. Cismaşiu, I. Cismaşiu, and C. Bedon. "Dynamic Characterisation and Finite Element Updating of a RC Stadium Grandstand." Buildings. 8 .10 (2018).
dos Santos, Amarante F., and C. Leitão. "Dynamic performance of a superelastic column–base connection." Structural Control and Health Monitoring . 25.7 (2018).
Cavaco, Eduardo S., Afonso Bastos, and Filipe Amarante dos Santos. "Effects of corrosion on the behaviour of precast concrete floor systems." Construction and Building Materials (2017).
Cismaşiu, C., A. Narciso, and F. Amarante dos Santos. "Experimental Dynamic Characterization and Finite Element Updating of a Footbridge Structure." Journal of Performance of Constructed Facilities. 10.1061/(ASCE)CF.1943-5509.0000615 (2014). AbstractWebsite

Nowadays, modern analysis of Civil Engineering structures implies the use of increasingly sophisticated computer models, designed not only to predict the response of actual structures to different loadings, but also to simulate the effects of eventual modifications in their structural configuration. Nevertheless, it is often discovered that, when the numerical simulations are compared with experimental data, the degree of correlation is weak preventing the use of the FE models with confidence in further analyses. In such cases, FE updating techniques are available to correct the FE models, based on dynamic response records of the real structures. These updating processes usually consist of four phases: a preliminary FE modeling, an experimental modal identification, a manual sensitivity analysis and, finally, an updating of the FE model. The present paper presents all four phases of a successful updating process for the FE model of a footbridge structure. It is shown how the last phase of the process can be performed fully automatically, by coupling an optimization routine with a commercial FE analysis program.

Rebelo, Hugo Bento, Filipe Amarante dos Santos, Corneliu Cismaşiu, and Duarte Santos. "Exploratory study on geodesic domes under blast loads." International Journal of Protective Structures (2019).
Bedon, Chiara, and Filipe Amarante dos Santos. "FE Exploratory Investigation on the Performance of SMA-Reinforced Laminated Glass Panels." Advanced Engineering Materials (2016).
Cismaşiu, C., and F. P. Amarante dos Santos. "Numerical simulation of superelastic shape memory alloys subjected to dynamic loads." Smart Materials and Structures. 17.2 (2008). AbstractWebsite

Superelasticity, a unique property of shape memory alloys (SMAs), allows the material to recover after withstanding large deformations. This recovery takes place without any residual strains, while dissipating a considerable amount of energy. This property makes SMAs particularly suitable for applications in vibration control devices. Numerical models, calibrated with experimental laboratory tests from the literature, are used to investigate the dynamic response of three vibration control devices, built up of austenitic superelastic wires. The energy dissipation and re-centering capabilities, important features of these devices, are clearly illustrated by the numerical tests. Their sensitivity to ambient temperature and strain rate is also addressed. Finally, one of these devices is tested as a seismic passive vibration control system in a simplified numerical model of a railway viaduct, subjected to different ground accelerations.

Bedon, Chiara, Xihong Zhang, Filipe Santos, Dániel Honfi, Marcin Kozłowski, Michel Arrigoni, Lucia Figuli, and David Lange. "Performance of structural glass facades under extreme loads–Design methods, existing research, current issues and trends." Construction and Building Materials. 163 (2018): 921-937.
Amarante dos Santos, Filipe, and Chiara Bedon. "Preliminary Experimental and Finite-Element Numerical Assessment of the Structural Performance of SMA-Reinforced GFRP Systems ." American Journal of Engineering and Applied Sciences . 9.3 (2016): 692-701.
Cismaşiu, Corneliu, Filipe Amarante Dos P. Santos, Rui Da Silva A. Perdigão, Vasco M. S. Bernardo, Paulo X. Candeias, Alexandra R. Carvalho, and Luís M. C. Guerreiro. "Seismic vulnerability assessment of a RC pedestrian crossing." Journal of Earthquake Engineering (2018).
Amarante dos Santos, F. P., C. Cismaşiu, and J. Pamies Teixeira. "Semi-active vibration control device based on superelastic NiTi wires." Structural Control and Health Monitoring. 20.6 (2013): 890-902. AbstractWebsite

The present paper presents a physical prototype that simulates the response of a single degree of freedom dynamic system, equipped with a novel semi-active vibration control device. This device comprises two superelastic NiTi elements working in phase opposition and aims to prevent deck unseating in simply supported bridges, during a seismic excitation. The special design of this device allows to avoid problems related to stress–relaxation phenomena and material degradation because of cyclic loading that have been observed in similar passive dissipation devices. The proposed design uses a strategy that permits the continuous adapting of the accumulated stress in the NiTi wires, on the basis of the response of the device to external excitations. Although unloaded, the NiTi elements remain strain/stress free, preventing stress–relaxation phenomena. With the occurrence of a dynamic excitation, a cumulative strain/stress process in the superelastic wires is initiated, enabling higher martensite transformation ratios and therefore increasing the damping capacities of the system while keeping the stresses in the wires inside a narrower superelastic window. The strain/stress accumulation in the superelastic wires is a direct result of the motion of the structure itself, with no need for external energy input.

Amarante dos Santos, Filipe. "Shape-memory alloys as macrostrain sensors." Structural Control and Health Monitoring (2016).
Amarante dos Santos, Filipe, Pedro Gonçalves, Corneliu Cismasiu, and Mauricio Gamboa-Marrufo. "Smart glass façade subjected to wind loadings." Proceedings of the ICE - Structures and Buildings. 167 (2014): 743-752.Website
Bedon, Chiara, Dániel Honfi, Klára V. Machalická, Martina Eliášová, Miroslav Vokáč, Marcin Kozłowski, Thomas Wüest, Filipe Amarante dos Santos, and Natalie Williams Portal. "Structural characterisation of adaptive facades in Europe - Part II: Validity of conventional experimental testing methods and key issues." Journal of Building Engineering. 25 (2019).
Bedon, Chiara, Dániel Honfi, Klára V. Machalická, Martina Eliášová, Miroslav Vokáč, Marcin Kozłowski, Thomas Wüest, Filipe Amarante dos Santos, and Natalie Williams Portal. "Structural characterisation of adaptive facades in Europe – Part I: Insight on classification rules, performance metrics and design methods." Journal of Building Engineering. 25 (2019).
Micheletti, A., FA dos Santos, and P. Sittner. "Superelastic tensegrities: matrix formulation and antagonistic actuation." Smart Materials and Structures . 27.10 (2018).