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Littérature scientifique sur le sujet « DISSIPATIVE BRACES »

Auteur : Grafiati

Publié le 1 avril 2023

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Articles de revues sur le sujet "DISSIPATIVE BRACES"

Kari, Amir, Mehdi Ghassemieh et Baitollah Badarloo. « Development and design of a new self-centering energy-dissipative brace for steel structures ». Journal of Intelligent Material Systems and Structures 30, n^o 6 (10 février 2019) : 924–38. http://dx.doi.org/10.1177/1045389x19828502.

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Buckling-restrained braces are able to provide significant energy dissipation along with large ductile capacity through their excellent hysteretic behavior. However, due to their lack of recentering capability, buckling-restrained braced frames experience large residual drifts following a strong earthquake, leading to enormous repair costs. To overcome this shortcoming, super-elastic shape memory alloy braces with excellent recentering capacity have been introduced as a viable alternative to steel braces. Nevertheless, their energy dissipation capacity is usually low for seismic applications. This article proposes a robust self-centering energy-dissipative brace to be used in structural frames. The brace is capable of providing adequate energy dissipation capacity in the structure while simultaneously bringing the structure to its original configuration after the earthquake.

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Liu, Lu, et Bin Wu. « Self-Centering Buckling-Restrained Braces ». Advanced Materials Research 639-640 (janvier 2013) : 846–49. http://dx.doi.org/10.4028/www.scientific.net/amr.639-640.846.

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Buckling-Restrained Brace (BRB) consists of energy dissipative core and a strengthening tube to prevent buckling when subjected to compression. Under cyclic loading, BRB exhibits elastoplastic hysteretic behavior, which leads to certain amount of permanent displacement in the structure after medium to severe earthquake. Residual deformations can result in increased cost of repairing. An innovative BRB device called Self-centering Buckling-Restrained Braces (SC-BRB) is devised to control maximum and residual drift of steel moment frame buildings subjected earthquakes. The SC-BRB is composed of the BRB energy dissipating cores which are responsible for energy dissipation, and the self-centering system which makes BRB energy dissipating core return to its initial position upon completely unloading. By exploring the mechanism of SC-BRB, it is found that to ensure fully self-centering capacity, the self-centering bar should have sufficient elongation capacity as well as considerably large elastic modulus which could afford stiffness in real structures

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Ferraioli, Massimiliano, et Angelo Lavino. « A Displacement-Based Design Method for Seismic Retrofit of RC Buildings Using Dissipative Braces ». Mathematical Problems in Engineering 2018 (27 décembre 2018) : 1–28. http://dx.doi.org/10.1155/2018/5364564.

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The paper proposes a displacement-based design method for seismic retrofit of RC buildings using hysteretic dissipative braces. At first, a fully multimodal procedure based on an adaptive version of the capacity spectrum method is applied to the 3D model of the damped braced structure. Then, the properties of an idealized bilinear model are defined using the seismic characteristics of the compound system thus accounting for the frame-damped brace interaction. Finally, an iterative procedure is developed to provide an optimal distribution of dampers. The proposed method overcomes the limitations of the design procedures in the literature that generally neglect the frame-damped braces interactions. Moreover, it addresses the main issues of seismic design of damped braces: effect of force demands applied to the frame due to the damper yielding and strain hardening, higher modes contribution, effect of soft-storey irregularities, and torsion effect in asymmetric buildings. The proposed design procedure is first validated using nonlinear static and dynamic analyses of a numerical example. Then, it is implemented to a real case study of a RC school building to assess its applicability in current practice.

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Payandehjoo, Barash, Saeid Sabouri-Ghomi et Parviz Ebadi. « Seismic Behavior of X-Shaped Drawer Bracing System (DBS) and X-Braced Frames with Heavy Central Core ». Journal of Earthquake and Tsunami 10, n^o 04 (octobre 2016) : 1650004. http://dx.doi.org/10.1142/s1793431116500044.

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In this work, seismic performance of conventional X-braced frames is enhanced by using Drawer Bracing Systems (DBS). DBS is an innovative structure, which increases ductility and energy absorption capacity of the X-braces through elimination of the harmful effects of local and global buckling and by converting the induced axial forces inside diagonal arms to flexural moments. Two half-scale specimens are tested under cyclic loading and the seismic performance of an X-shaped DBS is compared to that of an X-braced frame. Both braced frames are designed for equal nominal base shears and have similar frame sizes and dimensions. Test results confirm that converting the axial force to flexural moments in rational dissipative elements inside braces helps prevent the global and local buckling of braces in X-shaped DBS. Consequently, ductility and energy absorption capacity of the Concentrically Braced Frames (CBFs) is increased remarkably.

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Xie, Qin, Zhen Zhou, Canjun Li et Shaoping Meng. « Parametric Analysis and Direct Displacement-Based Design Method of Self-Centering Energy-Dissipative Steel-Braced Frames ». International Journal of Structural Stability and Dynamics 17, n^o 08 (octobre 2017) : 1750087. http://dx.doi.org/10.1142/s0219455417500870.

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The self-centering energy-dissipative (SCED) brace is a novel bracing element that can substantially reduce the residual deformation and enhance the reparability of structures. In this paper, nonlinear dynamic analyses have been conducted on a 4- and a 12-story steel-braced frame with SCED braces to study the effect of four important design parameters on the seismic performance of the SCED frames and recommendations are given for selection of the parameters. The parameters considered include the response modification coefficient [Formula: see text], the stiffness ratio of the brace [Formula: see text], the strength ratio of the brace [Formula: see text], and the fuse activation story drift [Formula: see text]. The relationship between the residual story drift and the peak story drift of the SCED frames is obtained based on these statistics. Finally, based on the equivalent linearization theory, a direct displacement-based design method applicable to the SCED frames, regarding both the peak story drift and residual story drift as the design objectives, is proposed.

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Bosco, M., A. Ghersi, E. M. Marino et P. P. Rossi. « A Capacity Design Procedure for Columns of Steel Structures with Diagonals Braces ». Open Construction and Building Technology Journal 8, n^o 1 (31 décembre 2014) : 196–207. http://dx.doi.org/10.2174/1874836801408010196.

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According to modern seismic codes, in concentrically braced frames the seismic input energy should be dissipated by means of the hysteretic behaviour of braces while all the other members (i.e. beams and columns) have to remain elastic. Accordingly, the design internal forces of braces are determined in these codes by elastic analysis of the structure subjected to seismic forces obtained by the design spectrum. The internal forces of the non-dissipative members, instead, are calculated by means of specified rules for the application of capacity design principles. According to some recent numerical analyses, the yielding or buckling of columns may take place before braces achieve their axial deformation capacity. This paper investigates the reasons of this unsatisfactory behaviour and proposes technological suggestions and a design procedure to improve the seismic performance of columns of building structures with diagonal braces.

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Costanzo, Silvia, et Landolfo Raffaele. « Concentrically Braced Frames : European vs. North American Seismic Design Provisions ». Open Civil Engineering Journal 11, n^o 1 (30 juin 2017) : 453–63. http://dx.doi.org/10.2174/1874149501711010453.

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A critical review of seismic design provisions for concentrically braced frames (CBFs) in both European and North American (i.e. US and Canadian) codes is presented in this paper. Indeed, even though those codes are based on capacity design philosophy, different requirements and different approaches are used to guarantee the hierarchy of resistances between dissipative and non-dissipative elements, thus leading different overall seismic performance. In detail, the main issues critically discussed are (i) the ductility classes and the correlated force-reduction factors; (ii) the structural analysis methods permitted by different codes; (iii) the modelling aspects of braces; (iv) the detailing rules for both dissipative (bracing members) and non-dissipative elements. Synoptic tables summarizing the corresponding assumptions and requirements in different codes are provided.

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Di Cesare, Antonio, Felice Carlo Ponzo, Nicla Lamarucciola et Domenico Nigro. « Experimental seismic response of a resilient 3-storey post-tensioned timber framed building with dissipative braces ». Bulletin of Earthquake Engineering 18, n^o 15 (6 octobre 2020) : 6825–48. http://dx.doi.org/10.1007/s10518-020-00969-y.

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Abstract With the increased number of multi-storey buildings in seismic areas, research efforts have been focused on developing earthquake resilient systems, such as low-damage techniques based on the combination of post-tensioning and dissipating devices. This paper describes the experimental study performed on a 3-storey post-tensioned timber framed (Pres-Lam) building equipped with energy dissipating systems. The testing project consisted of three phases adopting different configurations of the experimental model: (1) post-tensioning to beam-column joints only, (2) post-tensioning and dissipative rocking mechanisms and (3) post-tensioning and dissipative braces. The main objective of this paper is to experimentally investigate on the seismic response of a large-scale specimen with dissipative braces located in high seismic area, considering construction details similar to those adopted in practical applications. During the experimental campaign, the test frame was subjected to more than one hundred ground motions considering a set of seven spectra-compatible earthquakes at increasing intensity levels. The dissipating bracing system with external replaceable hysteretic dampers improves the seismic resilience of multi-storey Pres-Lam buildings, showing inter-storey drift comparable to those with rocking walls, with full recentring capability and without structural damages or post-tensioning losses through seismic tests.

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Barbagallo, Francesca, Melina Bosco, Marco Caragliano, Edoardo M. Marino et Pier Paolo Rossi. « An Alternative Approach for the Design of Chevron-Braced Frames ». Applied Sciences 11, n^o 22 (20 novembre 2021) : 11014. http://dx.doi.org/10.3390/app112211014.

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The design of steel chevron-braced frames as per Eurocode 8 is based on the idea that only the braces should buckle and yield during ground motions, while other members should remain elastic. The elastic design of the braced frames is also allowed. However, in both cases, the seismic performance of the frame may be compromised because of premature yielding/buckling of columns. This paper proposes an alternative design procedure that promotes yielding of beams in addition to yielding of braces. This mitigates the vertical unbalanced force transmitted by compressive and tensile braces to the beam and in turn reduces the internal forces of the columns. The result is the overall improvement of the seismic performance owing to the reduction of the number of cases in which failure of the columns occurs before full exploitation of the ductility capacity of the dissipative members. The proposed design procedure is validated by incremental dynamic analyses performed on a set of chevron-braced frames. In particular, the peak ground accelerations of the frames designed by the proposed procedure at the attainment of Significant Damage and Collapse Prevention limit states are determined and compared to those of frames designed according to Eurocode 8. Furthermore, frames designed according to the Eurocodes and to the proposed method are compared in terms of structural cost.

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Xiao, Yi, Marc O. Eberhard, Ying Zhou et John F. Stanton. « Proportioning of self‐centering energy dissipative braces ». Earthquake Engineering & ; Structural Dynamics 50, n^o 10 (27 avril 2021) : 2613–33. http://dx.doi.org/10.1002/eqe.3463.

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Thèses sur le sujet "DISSIPATIVE BRACES"

Voller, Gordon Paul. « Analysis of heat dissipation from railway and automotive friction brakes ». Thesis, Brunel University, 2003. http://bura.brunel.ac.uk/handle/2438/5558.

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The thesis presents research into the understanding and improvement of heat dissipation from friction brakes. The investigations involved two brake types, considered to be the most thermally loaded and therefore most challenging; axle mounted high speed railway and commercial vehicle disc brakes. All three modes of heat transfer (conduction, convection and radiation) and airflow characteristics have been analysed experimentally and theoretically in order to increase the understanding of heat dissipation. Despite the very practical aspects of this research, a 'generic heat transfer approach' was applied, enabling wider engineering applications of the results. Experimental analyses conducted on a specially developed Spin Rig allowed measurements of cooling and airflow characteristics for different designs. Methodologies have been developed to determine thermal contact resistance, heat transfer coefficients, emissivity and aerodynamic (pumping) losses. Established values and relationships compared very favourably with theoretical work. Analytical, FE and CFD analyses were employed to further investigate design variations and perform sensitivity studies. Inertia dynamometer route simulations provided disc temperatures for validation of the overall work. Recommendations have been made for optimising heat dissipation, by proposing practically acceptable and economically viable design solutions. A proposed ventilated disc design efficiency ratio allows large, high speed ventilated disc designs, to be efficiently and accurately evaluated and compared, providing a valuable disc design optimisation tool. The determination of the methodologies, parameters and functions defining cooling characteristics, enable heat dissipation to be predicted confidently and accurately for brakes and other engineering assemblies at early design stages.

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Jeffers, Brandon. « Parametric Study of Self-Centering Concentrically-Braced Frames with Friction-Based Energy Dissipation ». University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1335901155.

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Reed, Matthew Robert. « Development of an Improved Dissipative Passive Haptic Display ». Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/5284.

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This project focuses on the design and modeling of a two degree-of-freedom dissipative passive haptic display. Haptic displays are man-machine interfaces that transmit forces to the human operator. A dissipative passive haptic display is one that may only remove energy from the system using actuators such as brakes and dampers, thus ensuring the safety of the human operator. These devices may be used to implement virtual constraints such as desired paths and obstacles. Traditional friction brakes have previously been used as dissipative and coupling elements in a two degree-of-freedom parallel manipulator, resulting in undesired effects such as vibration, stiction, and slow response times. Alternatively, the new robot is actuated by rheological brakes, which feature fast response times and smooth application of torque. This approach aims to improve upon the accuracy and feel of the previous design. A commercial magnetorheological (MR) fluid brake was selected and put through an extensive series of tests. The data was used to develop a model that characterizes MR fluid behavior in low speed braking applications. A parallel five bar linkage was designed and built that has separate configurations corresponding to 3-brake and 4-brake operation. The length of each arm was chosen by means of a geometrical optimization that weighs the size and area of the workspace and actuator effects. A simulation was then developed by incorporating the brake model into the equations of motion of the robot. Next, two forms of path following velocity control were devised and tested in simulation. Finally, the accuracy, workload, and smoothness of both controllers and both configurations were examined in preliminary tests with human operators.

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Fiocchi, Alice. « Inserimento di controventi dissipativi in acciaio in un capannone in calcestruzzo armato prefabbricato a due piani ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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In questa tesi si propone il miglioramento sismico di un capannone in calcestruzzo armato prefabbricato a due piani a pilastri isostatici mediante l'inserimento di controventi dissipativi in acciaio con forma speciale (Crescent-Shaped-Braces). PREMESSA In primo luogo si dimostra come la struttura studiata soddisfi già i requisiti del DM 2008, sia allo SLD (spostamenti d’ interpiano) che allo SLV (elementi strutturali verificati). OBIETTIVO Migliorare le caratteristiche prestazionali di un edificio in calcestruzzo armato prefabbricato a due piani, sottoposto ad azione sismica. STRATEGIA Inserimento di dispositivi dissipativi di tipo Crescent Shaped Brace in alcune specchiature del capannone prefabbricato, in entrambe le direzioni. PROGETTAZIONE DELLA STRUTTURA RINFORZATA 1) Identificazione delle caratteristiche (rigidezza e resistenza) dei dispositivi CSB, sulla base di obiettivi scalati al livello superiore (deformabilità allo SLV e resistenza allo SLC) per il sistema «struttura + dispositivi», attraverso lo sviluppo di una procedura specifica per capannoni prefabbricati a 2 piani. 2) Progettazione dei dispositivi CSB (scelta della geometria e della sezione) 3) Verifica delle effettive prestazioni ottenute mediante simulazioni numeriche time-history

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Barbieri, Laura. « Studio del comportamento sismico di edifici in CLT con connessioni dissipative del tipo X-bracket ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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La risposta sismica degli edifici CLT è analizzata con lo scopo di valutare la correlazione tra la capacità dissipativa, rappresentata dal fattore di comportamento q, e la metodologia di costruzione, ovvero le proprietà geometriche dell'edificio ed il comportamento delle connessioni adottate. Questo studio presenta un modello numerico in grado di simulare la risposta dinamica di una parete a tre piani costituita da pannelli portanti a strati incrociati, nella quale sono state utilizzate connessioni innovative, rappresentate da staffe ad alta capacità dissipativa caratterizzate da una particolare forma ad "X": queste staffe sono resistenti a forze di trazione e a forze di taglio e sono state concepite per realizzare tutti i giunti sismici dell'edificio, con un tipo di collegamento unico in grado di massimizzare la capacità sismica di tutta la struttura, assicurando alta duttilità e comportamento allo schiacciamento trascurabile. Questa nuova connessione è stata studiata ed ottimizzata attraverso modellazione numerica; poi, il suo comportamento è stato convalidato attraverso test sperimentali. La connessione di tipo X-bracket, quando viene utilizzata per collegare pannelli CLT alle fondazioni, ai diaframmi, ai solai o anche reciprocamente, consente di raggiungere elevata dissipazione e duttilità anche quando vengono adottate grandi pareti in CLT senza giunzioni verticali. A tal proposito, è stata eseguita un'analisi dinamica incrementale su due diverse configurazioni della parete progettata, differenti per quantità di connessioni e per la presenza o meno di giunzioni verticali, allo scopo di valutare il valore del fattore di comportamento q, in funzione delle scelte progettuali e delle proprietà geometriche dell'edificio.

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Tonini, Chiara. « Studio di un collegamento trave-pilastro di tipo semirigido dissipativo ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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L'elaborato di tesi tratta lo studio di un collegamento trave-pilastro di tipo semirigido dissipativo. L’idea progettuale alla base di tale studio è quella di posizionare nel nodo trave-pilastro di un telaio in acciaio una coppia di dispositivi metallici che durante il sisma si snervino prima dei pilastri. In tal caso infatti si concentrerebbe parte della dissipazione energetica in tali dispositivi ritardando la formazione delle cerniere plastiche alla base dei pilastri e preservando quindi questi ultimi dalla plasticizzazione. Lo studio è stato effettuato considerando come dispositivi metallici i Crescent Shaped Braces (CSB), dispositivi isteretici che, grazie alla loro configurazione geometrica, sono caratterizzati da un legame costituivo elastico-incrudente trilineare. A partire proprio da tale legame costitutivo (noto una volta ipotizzate le dimensioni e la sezione dei CSB) e dalla configurazione geometrica del nodo trave-pilastro, si è studiato il comportamento del collegamento fino alla determinazione del legame Momento-Rotazione: per ogni rotazione della trave rispetto al pilastro si ha infatti una reazione dei CSB che generano sulla trave un momento contrario alla rotazione stessa. Si è poi passati ad un particolare caso di studio, andando ad analizzare il beneficio in ambito sismico derivante dall’inserimento dei Crescent Shaped Brace nei nodi trave-pilastro di un telaio monopiano a singola campata in acciaio. Per verificare tale beneficio si sono eseguite delle analisi non lineari (statiche e dinamiche) su telai con e senza CSB e se ne sono confrontati i risultati.

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PHAM, Chi-Tuong. « Stabilité et dynamique d'écoulements de fluides parfaits barotropes autour d'un obstacle en présence de dispersion ». Phd thesis, Université Pierre et Marie Curie - Paris VI, 2003. http://tel.archives-ouvertes.fr/tel-00006825.

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Cette thèse regroupe une série de travaux ayant tous trait à des systèmes hamiltoniens non linéaires spatialement étendus présentant une bifurcation nœud-col. Elle est constituée de deux parties. Nous étudions dans une première partie la transition à la dissipation de systèmes unidimensionnels soumis à un forçage local et régis par des équations de type sine-Gordon ou Schrödinger non linéaire (ESNL). Nous en calculons analytiquement les solutions stationnaires et caractérisons le comportement dynamique au voisinage de celles-ci près de la bifurcation. Lorsque la relation de dispersion des systèmes possède une fréquence de coupure, le comportement dynamique est caractéristique de systèmes hamiltoniens. A contrario, lorsque la relation de dispersion ne possède pas de fréquence de coupure, la dynamique du système se couple avec l'émission d'ondes sonores qui joue le rôle d'un amortissement effectif. Elle devient alors typique de systèmes dissipatifs. En outre, les modes propres temporels du système subissent une délocalisation spatiale. La seconde partie de la thèse concerne l'étude de deux types d'écoulements bidimensionnels de fluides parfaits barotropes autour d'un obstacle : un écoulement décrit par l'ESNL et un écoulement à surface libre dans l'approximation eau peu profonde, où sont pris en compte les effets dispersifs dus aux effets de tension de surface. Lorsque la longueur caractérisant la dispersion des ondes sonores tend vers zéro, ces deux écoulements se réduisent à l'écoulement autour d'un disque d'un fluide eulérien compressible, auquel se superpose une couche limite que nous calculons analytiquement. Par des méthodes de suivi de branches fondés sur des développements pseudo-spectraux, nous calculons le diagramme de bifurcation complet des deux écoulements. En étudiant la dynamique des deux systèmes au-delà de la bifurcation, nous mettons en évidence une émission d'excitations (dans le cas de l'ESNL) dont la nature dépend du rapport de la longueur de cohérence sur la taille de l'obstacle. Dans le cadre de l'écoulement en eau peu profonde, cette émission est remplacée par une singularité à temps fini de démouillage.

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Simon, Madrenas Enric. « Predicción de la fatiga de disipadores de energía elastoplásticos para estructuras sismorresistentes ». Doctoral thesis, Universitat de Girona, 2021. http://hdl.handle.net/10803/673931.

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Elastoplastic energy dissipators are used in earthquake-resistant design in order to dissipate a substantial part of the seismic energy acting on a building. They are elements that are not part of the load-bearing structure and, therefore, are easily replaceable in case of damage. Their behaviour is usually stable and their degree of degradation difficult to appreciate visually. To assess their degree of degradation, damage indices are used which estimate their remaining dissipative capacity through the combination of a number of variables such as, for example, the number of cycles sustained and their amplitude, the energy dissipated, accumulated deformation and maximum deformation. In the first part of this doctoral thesis, the current state-of-the-art in terms of existing damage models is reviewed. The second part of this thesis brings together a wide experimental foundation based on data obtained in previous research works complemented with new tests carried out within the present thesis. In its third part, the validity of various fatigue models is assessed through the experimental foundation brought together in the second part of this thesis. In its fourth and final part, the validity of some of the best-known hysteretic models has been analyzed in order to reproduce the experimental response of the dissipators tested. Notable as the most important contribution of this thesis is the attainment of two models of mixed fatigue and dimensionless variables, which demonstrate excellent validity considering, in the same fatigue curve, dissipators of different types and geometry based on low carbon steel and uniform plastification in uniaxial states of stress
Els dissipadors d’energia elastoplàstics s’utilitzen en el disseny sísmic per dissipar una part substancial de l’energia sísmica introduïda en una construcció. Són uns elements que no formen part de l’estructura portant i, per tant, fàcilment reemplaçables en cas de quedar danyats. El seu comportament sol ser estable i el seu grau de degradació difícilment apreciable de forma visual. Per avaluar el seu grau de degradació es recorre als índex de dany, que estimen la capacitat dissipativa romanent a partir de la combinació de variables diverses com són, per exemple, el nombre de cicles suportats i la seva amplitud, l’energia dissipada, la deformació acumulada i deformació màxima. A la primera part d’aquesta tesi doctoral es revisa l’estat de l’art relatiu a models de dany existents. La segona part d’aquesta tesi recull una àmplia base experimental basada en dades obtingudes en treballs previs de recerca, complementats amb nous assajos realitzats a la present tesi. En una tercera part es valora la bondat de diversos models de fatiga mitjançant la base experimental recollida a la segona part. En la seva quarta i última part s’ha analitzat la bondat d’alguns dels models histerètics més coneguts per a reproduir la resposta experimental dels dissipadors assajats. La conclusió més important que s’extreu de la tesi és l’obtenció de dos models de fatiga mixtes i variables adimensionals, els quals demostren una excel·lent bondat considerant, en una mateixa corba de fatiga, dissipadors de diferent tipologia i geometria, basats en acers de baix contingut en carboni i plastificació uniforme en estat uniaxial de tensions
Programa de Doctorat en Tecnologia

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Chen, Ying-Chuan, et 陳映全. « Development and Validation for Double-Core Self-Centering Energy Dissipative Braces ». Thesis, 2011. http://ndltd.ncl.edu.tw/handle/15652067921497178408.

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碩士
國立臺灣大學
土木工程學研究所
100
Self-Centering Energy Dissipative Brace is a kind of brace which uses tendons to constrain compression elements of the brace and provide self-centering properties under tension and compression force (restore to zero residual deformation). Traditional self-centering energy dissipative brace’s deformation capacity relies on the elastic deformation capacity of the tendons used inside the brace, and results in limitation of the braces’ deformability. Traditional SCED brace has a maximum strain of 1.3% when the tendons reach 1.9% strain and the frame reaches 2% inter-story drift. Tendons required to have large elastic strain mainly uses composite material. However, tendons having over 2% elastic strain material properties are rare and seldom used or researched. This research develops a new kind of SCED brace by adding a second core element and another group of tension elements which doubles the deformation capacity compared to traditional SCED brace while using tension elements comprised of the same material properties (or largely reduce the elastic strain demand of the tendon elements to 1% under the same brace deformation when compared to traditional SCED brace). This research designed four specimens to validate the double core SCED brace which uses different materials for its tendons. Four specimens’ tendon uses D16 steel strand, D22 glass fiber, D29 glass fiber and D13 carbon fiber respectively. The results show that the mechanism of double core SCED brace is consistent with prediction. The test results and prediction of tendon strain is close which is 0.8%, 1.05%, 0.9% and 1.09% for specimen 1 to 4 respectively while the brace has a 1.2% strain corresponding to 2% inter-story drift. The result shows that double core SCED brace can significantly reduce the demand for tendon elastic strain. Except specimen 1 due to loss of pre-tension force has poor behavior in self-centering, specimen 2 to 4 have good behavior in self-centering with no pre-tension loss. This research also uses the finite element software ABAQUS to analyze double core SCED brace behavior and compare with the testing results which is proved similar. The parametric study of double core SCED brace we choose different pre-tension force, different friction force, and different tendons to observe the difference in brace behavior. Results indicate that the lager the friction force is the larger the energy dissipation there will be, yet in order to have full self-centering behavior, the pre-tension force should be larger than friction force. However the larger the pre-tension force is the smaller the deformation capacity there is left. Unlike pre-tension force and friction force, the difference of tendons only effect the post-stiffness of the response and limits the deformation capacity due to its limitation in elastic strain.

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RAHMAT, RABI RAIHAN. « Proposal of energy-based method for the design of passive energy dissipative braces ». Doctoral thesis, 2020. http://hdl.handle.net/11573/1359668.

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Earthquake-prone regions of the world are usually characterized by a high number of Reinforced Concrete (RC) buildings designed before seismic building codes were enforced. As a result, the amount of existing RC buildings requiring seismic assessment and likely retrofitting is large. The use of innovative techniques for the seismic amelioration of existing RC buildings has been attracting the attention of both academic and technical communities since the second half of the previous century. Among these techniques there is the employment of passive energy dissipating devices that are mounted in series to metallic braces installed within the existing RC frames. Such energy dissipating devices can be 1) fluid-viscous, 2) viscoelastic, 3) elasto-plastic, 4) frictional or 5) based on shape-memory alloys. The large number of devices available on the market is not accompanied yet, at least within the Italian Building Code, by a mature and detailed description of the design procedure, so that the practicing engineer who would like to adopt this technique is often referred to scientific publications. With the aim to contribute to fill this gap, an energy-based methodology is proposed and applied and compared with some of the most innovative design procedures available in the scientific literature to date. The validity of each procedure is appraised on the basis of non-linear static and non-linear dynamic analysis results.

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Chapitres de livres sur le sujet "DISSIPATIVE BRACES"

Anto, Anjanet, et Asha Joseph. « Seismic Performance Evaluation of Seesaw Braced Energy Dissipation System ». Dans Lecture Notes in Civil Engineering, 313–25. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-80312-4_27.

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Ma, Cuiling. « Credibility of Estimating the Hysteretic Energy Demands of Concentrically Braced Steel Frames ». Dans Advances in Frontier Research on Engineering Structures, 175–83. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8657-4_16.

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AbstractEarthquake happens frequently in China, and seismic design is of high importance for buildings. The energy-based seismic design method with clear conception has attracted attention of more and more researchers. One of the initial questions is how to determine the energy requirement. In this paper, the finite element software is used to analyze the time history of the concentrically braced steel frames designed according to the current codes and standards. The analysis shows that the cumulative demand obtained by time history analysis is similar to the estimated value. The hysteretic energy dissipation of the concentrically braced steel frames is of small top and big bottom along the height of the structure, and the energy dissipation of the floors below the height of H/3 (H is the height of the structure) is larger. Under rare earthquakes, the yield mode of structures designed according to the elastic design method of small earthquakes is uncontrollable, so it is necessary to study the design method based on energy behavior.

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Yin, Zhanzhong, Xiuli Wang et Xiaodong Li. « Hysteretic Response and Energy Dissipation of Double-Tube Buckling Restrained Braces with Contact Ring ». Dans Computational Structural Engineering, 173–79. Dordrecht : Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2822-8_20.

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Xiao, Mei Ling, Liao Yuan Ye, Sheng Miao et Ben Yu Liu. « Damage and Crack Analysis for Reinforced Concrete Energy Dissipation Braced Frame (EDBF) under Low Cyclic Loads ». Dans Fracture and Damage Mechanics V, 611–14. Stafa : Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-413-8.611.

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« A comparative analysis of performances of high strength steel dual frames of buckling restrained braces vs. dissipative shear walls ». Dans Behaviour of Steel Structures in Seismic Areas, 163–70. CRC Press, 2009. http://dx.doi.org/10.1201/9780203861592-25.

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Dinu, F., D. Dubina et C. Neagu. « A comparative analysis of performances of high strength steel dual frames of buckling restrained braces vs. dissipative shear walls ». Dans Behaviour of Steel Structures in Seismic Areas. CRC Press, 2009. http://dx.doi.org/10.1201/9780203861592.ch21.

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« Seismic upgrade of existing semi-continuous steel frames : A comparison between the use of concentric steel braces and viscoelastic dissipative systems ». Dans Behaviour of Steel Structures in Seismic Areas, 545–52. CRC Press, 2009. http://dx.doi.org/10.1201/9780203861592-89.

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Beris, Antony N., et Brian J. Edwards. « The Dissipation Bracket ». Dans Thermodynamics of Flowing Systems : with Internal Microstructure. Oxford University Press, 1994. http://dx.doi.org/10.1093/oso/9780195076943.003.0011.

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In the opening chapters of the book, we saw how a variety of conservative phenomena could be described through the Poisson bracket of classical physics. As already mentioned, the majority of systems with which engineers and physicists must deal reveal dissipative phenomena inherent to their nature. In the last chapter we offered a concise overview of nonequilibrium thermodynamics as traditionally applied to describe, close to equilibrium, dissipative dynamic phenomena. In this chapter, we lay the groundwork for the incorporation of non-conservative effects into an equation of Hamiltonian form, and show several well-known examples in way of proof that such a thesis is, in fact, tenable. The unified formulation of conservative and dissipative processes based on the fundamental equations of motion is not a new idea. Among the most complete treatments is the one offered by the Brussels school of thermodynamics [Prigogine et al., 1973; Prigogine, 1973; Henin, 1974] based on a modified Liouville/von Neumann equation. This is a seminal work where, using the mathematical approach of projection operators and relying only on first principles, it is demonstrated how large isolated dynamic systems may present dissipative properties in some asymptotic limit. A key characteristic of their theory is that dissipative phenomena arise spontaneously without the need of any macroscopic assumptions, including that of local equilibrium [Prigogine et al., 1973, p. 6]. The main value, however, is mostly theoretical, demonstrating the compatibility of dissipative, irreversible, processes with the reversible dynamics of elemental processes through a “symmetry-breaking process.” The value of the theory in applications is limited since it relies on a quantum mechanical equation for the density matrix ρ which is, in general, very difficult to solve except for highly simplified problems [Henin, 1974]. In a nutshell, we hope to offer with the present work a macroscopic equivalent of the Brussels school theory which, at the expense of the introduction of the local equilibrium assumption, attempts to unify the description of dynamic and dissipative phenomena from a continuum, macroscopic viewpoint. The main tool to achieve that goal is the extension of the Poisson bracket formalism, analyzed in chapter 5, to dissipative continua.

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« Acceleration Time and Heat Dissipation Calculations ». Dans Clutches and Brakes. CRC Press, 2004. http://dx.doi.org/10.1201/9780203026236.ch8.

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Steel, Duncan G. « Loss and Dissipation : The RLC Circuit ». Dans Introduction to Quantum Nanotechnology, 230–46. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192895073.003.0014.

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The effects of energy loss or dissipation is well-known and understood in classical systems. It is the source of heat in LCR circuits and in the application of brakes in a vehicle or why a struck bell does not ring indefinitely. Understanding quantum behavior begins with understanding the Hamiltonian for the problem. Classically, loss arises from a coupling of the Hamiltonian for an isolated quantum system to a continuum of states. We look at such a Hamiltonian and develop the equations of motion following the rules of quantum mechanics and find that even in a quantum system, this coupling leads to loss and non-conservation of probability in the otherwise isolated quantum system. This is the Weisskopf–Wigner formalism that is then used to understand the quantum LCR circuit. The same formalism is used in Chapter 15 for the decay of isolated quantum systems by coupling to the quantum vacuum and the resulting emission of a photon.

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Actes de conférences sur le sujet "DISSIPATIVE BRACES"

Bergami, A.-V., et C. Nuti. « DESIGN OF DISSIPATIVE BRACES FOR AN EXISTING STRATEGIC BUILDING WITH A PUSHOVER BASED PROCEDURE ». Dans 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering. Athens : Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2014. http://dx.doi.org/10.7712/120113.4677.c1143.

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Mazza, Fabio, Alfonso Vulcano, Adolfo Santini et Nicola Moraci. « Displacement-Based Seismic Design Procedure for Framed Buildings with Dissipative Braces Part I : Theoretical formulation ». Dans 2008 SEISMIC ENGINEERING CONFERENCE : Commemorating the 1908 Messina and Reggio Calabria Earthquake. AIP, 2008. http://dx.doi.org/10.1063/1.2963763.

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Mazza, Fabio, Alfonso Vulcano, Adolfo Santini et Nicola Moraci. « Displacement-Based Seismic Design Procedure for Framed Buildings with Dissipative Braces Part II : Numerical Results ». Dans 2008 SEISMIC ENGINEERING CONFERENCE : Commemorating the 1908 Messina and Reggio Calabria Earthquake. AIP, 2008. http://dx.doi.org/10.1063/1.2963764.

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Ceccolini, Nicola, Alessandro Zona, Andrea Dall’Asta et Gaetano Della Corte. « Influence of design criteria on the seismic response of single-storey steel buildings ». Dans IABSE Symposium, Prague 2022 : Challenges for Existing and Oncoming Structures. Zurich, Switzerland : International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.0624.

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Structural design in seismic areas could be based on either dissipative or non-dissipative concepts, as for example allowed in European and Italian codes. In the first case, capacity design is the basis of structural dimensioning; both strength and ductility verifications are required. In the second case, structural elements are designed to remain in the elastic field under the assigned design seismic input; ductility verifications are not enforced. In steel structures, these two design approaches might lead to very different seismic structural performances, depending on the role that the non-ductile elements and connections have in the non-dissipative design. This situation might represent a source of weakness and lead to premature failures. In the present work, with reference to a single- storey steel industrial building with moment-resisting frames in the transverse direction and con- centric braces in the longitudinal direction, the critical issues encountered when modelling the post- elastic behaviour of a non-dissipative steel structure are discussed. Subsequently, a comparison is made with a structure with the same geometry, designed with dissipative structural behaviour.

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Terenzi, Gloria, Iacopo Costoli et Stefano Sorace. « Redesign of a dissipative bracing-based retrofit intervention for an earthquake damaged school building ». Dans IABSE Congress, Christchurch 2021 : Resilient technologies for sustainable infrastructure. Zurich, Switzerland : International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/christchurch.2021.0605.

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A school building with reinforced concrete structure, seismically retrofitted in 2013 and damaged by the 2016 Central Italy earthquake, is examined in this paper. A time-history assessment analysis is initially carried out in pre-rehabilitated conditions by simulating also the presence of the clay brick masonry infill perimeter walls and partitions in the finite element model of the structure. Based on the results of this analysis, a different retrofit solution is proposed, consisting in the incorporation of dissipative braces equipped with pressurized fluid viscous dampers. The verification analyses developed in this new configuration for the main shock records of the 2016 earthquake highlight slightly damaged and easily repairable response conditions of a little number of partitions — instead of the diffused moderate-to-severe damage surveyed in the building internal and perimeter infills— and an elastic response of structural members.

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Thibault, Pierre, Charles-Darwin Annan et Pampa Dey. « Investigation of hybrid multi-core buckling-restrained brace components ». Dans IABSE Congress, Ghent 2021 : Structural Engineering for Future Societal Needs. Zurich, Switzerland : International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/ghent.2021.1415.

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Contemporary seismic-resistant design of steel braced frames is based on dissipating seismic energy through significant inelastic axial deformation in brace components. Buckling-restrained braced (BRB) frames are a type of concentrically braced frame (CBF) characterised by braces that yield both in tension and in compression. These braces therefore exhibit superior cyclic performance compared with traditional CBFs. However, buckling-restrained braces commonly display a low post- yield stiffness, causing substantial interstory drifts and large residual drifts after seismic events. Moreover, yielding of the core is often only tied to a single performance objective, thus making its performance at other levels of seismicity largely unknown. One promising solution is the use of a hybrid BRB, where multiple cores made from different metals are connected in parallel to work together and complement each other. This research is geared towards first evaluating the potential of different combinations of core materials, followed by the design of a hybrid BRB system that can accommodate multiple core plates. Results show that the post-yield behaviour of hybrid BRBs is improved by employing a combination of 350WT carbon steel and another metal with low-yield and high strain-hardening behaviour, such as stainless steels, aluminium alloys, or other grades of carbon steels. Finally, a detailed overview of one hybrid BRB solution is proposed.

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Clark, Peter W., Ian D. Aiken, Kazuhiko Kasai et Isao Kimura. « Large-Scale Testing of Steel Unbonded Braces for Energy Dissipation ». Dans Structures Congress 2000. Reston, VA : American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40492(2000)12.

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WU, An-Chien, Li-Wei CHEN et Keh-Chyuan TSAI. « EXPERIMENTAL STUDY ON OUT-OF-PLANE STABILITY OF BUCKLING-RESTRAINED BRACES ». Dans The 16th World Conference on Seismic Isolation, Energy Dissipation and Active Vibration Control of Structures. Russian Association for Earthquake Engineering and Protection from Natural and Manmade Hazards, 2019. http://dx.doi.org/10.37153/2686-7974-2019-16-1163-1171.

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Nastri, Elide. « ECCENTRICALLY BRACED FRAMES DESIGNED FOR THE ENERGY DISSIPATION OPTIMIZATION ». Dans VII European Congress on Computational Methods in Applied Sciences and Engineering. Athens : Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2016. http://dx.doi.org/10.7712/100016.2427.7614.

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Erochko, J., C. Christopoulos et R. Tremblay. « DETAILED COMPONENT MODELLING OF A SELF-CENTERING ENERGY DISSIPATIVE BRACE SYSTEM ». Dans 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering. Athens : Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2014. http://dx.doi.org/10.7712/120113.4628.c1157.

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Rapports d'organisations sur le sujet "DISSIPATIVE BRACES"

FEASIBILITY STUDY OF VISCOELASTIC HYBRID SELF-CENTERING BRACE (VSCB) FOR SEISMIC-RESISTANT STEEL FRAMES. The Hong Kong Institute of Steel Construction, août 2022. http://dx.doi.org/10.18057/icass2020.p.113.

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The practicability of existing self-centering braces is largely limited by their small deformability and insufficient energy dissipation. This paper presents a new type of velocity-dependent self-centering brace called viscoelastic self-centering brace (VSCB), which employs viscoelastic dampers (VED) and SMA cables as the kernel elements. The SMA cables can offer large recoverable deformation, and the viscoelastic dampers, which are velocity-dependent, provide considerable energy dissipation under high-frequency loading excitations but tend to have less detrimental influence on the self-centering capability during the shakedown of the system. A comprehensive system-level analysis on three carefully designed prototype buildings was conducted, including a buckling restrained braced frame (BRBF), a pure self-centering braced frame (SCBF) and a viscoelastic self-centering braced frame (VSCBF). The results show that compared with the SCBF, the VSCBF maintains the benefit of small residual inter-story drift (RID) and in addition, exhibits obviously reduced peak inter-story drift (PID) and peak floor acceleration (PFA).

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TEST ON RESILIENCE CAPACITY OF SELF-CENTERING BUCKLING RESTRAINED BRACE WITH DISC SPRINGS. The Hong Kong Institute of Steel Construction, août 2022. http://dx.doi.org/10.18057/icass2020.p.156.

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The properly constructed buckling restrained braces (BRBs) usually have good ductility and energy dissipation capacity and therefore can be used in braced steel frames. However, large residual plastic deformation of the BRBs deteriorates their resilience capacity and hence results in large residual deformation of the buckling restrained braced steel frames (BRBFs) under large drifts. To reduce the residual deformation of BRB while keeping good ductility and energy dissipation capacity, a new self-centering buckling restrained brace (SCBRB), letting both BRB part and self-centering part work in parallel, is proposed. The self-centering capacity of SCBRB is provided by a combination of pre-compressed disc springs, which provides restoring forces and facilitates reduction of the residual deformation of the BRB. The BRB is composed of a core steel plate brace, a restraining member formed by the circular steel tube filled with mortar, and debonding materials between them. By quasi-static tests, one self-centering buckling restrained brace specimen (SCBRB) and one pure BRB specimen were tested to mainly examine the constructional details and hysteretic behavior of SCBRB. The material and configuration details of core steel plate brace in both the SCBRB and the pure BRB are the same for comparison. The test results show that, compared with the pure BRB which still exhibits large residual deformation, the SCBRB presents a flag-shape hysteretic performance and its residual deformation decreases significantly. The hysteretic curves of both the SCBRB and the pure BRB are stable before tension fracture of plate brace due to low cyclic fatigue, and the other components remained intact.

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THE SEISMIC PERFORMANCE OF DOUBLE TUBE BUCKLING RESTRAINED BRACE WITH CAST STEEL CONNECTORS. The Hong Kong Institute of Steel Construction, mars 2022. http://dx.doi.org/10.18057/ijasc.2022.18.1.2.

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The special concentrically braced frame (SCBF) is an aseismic structure, but its bracing system exhibits brittle failure and premature buckling connected with the weld fracture of the gusset plate and the post-buckling of the braces; thus, maximizing the role of energy dissipation is difficult. Here, this paper proposes a system of double-tube buckling-restrained brace with cast steel connectors for steel SCBFs. The large inelastic deformation of the bracing system is mainly concentrated in the ductile cast connectors under the earthquake, and the degree of buckling and post-buckling of braces can be reduced. Cyclic loading tests were conducted on two groups of specimens with different parameters, then the deformation trend, stress distribution, energy dissipation capacity, and stiffness degradation of the specimens were analyzed. The improved measures of increasing the width–thickness ratio of the energy dissipation plate and stiffener and casting the end right-angle tip tightly for a certain length of cast connector in Group 2 specimens, which overcomes the brittle fracture caused by the crack of the connection segment due to flexural buckling in Group 1 specimen tests, was evaluated. The cast steel connector conducts the main energy dissipation member that exhibits good ductile and energy absorption performance, and the advantages of using improved ductile cast steel connectors to obtain the energy dissipation of BRBs are illustrated. The test results provided direct evidence that the seismic performance of specimens is closely associated with the length of the energy dissipation segment of the cast connector and the overstrength factor of axial force. Also, the strength, rigidity, deformation, and energy dissipation performance of the members can be independently controlled by reasonably designing the cast connector. Our results provide the underlying insights needed to guide the design of the bracing connector.

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EXPERIMENTAL BEHAVIOR AND DESIGN OF RECTANGULAR CONCRETE-FILLED TUBULAR BUCKLING-RESTRAINED BRACES. The Hong Kong Institute of Steel Construction, décembre 2021. http://dx.doi.org/10.18057/ijasc.2021.17.4.5.

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This paper proposes a new design method for concrete-filled tubular buckling-restrained braces (CFT-BRBs) by incorporating the confinement effect on pre-buckling rigidity. A series of experiments are performed to investigate the effects of concrete strength and sectional dimension on the initial stiffness, ultimate strength, and energy dissipation behaviors. Experimental results indicate that the confined concrete plays an important role in the energy dissipating capacity of CFT-BRBs. On the other hand, the sectional dimensions of the steel tube and core are influential factors governing the ultimate failure modes of CFT-BRBs. The findings in study provide technical supports to optimize the design methods for ductile seismic performance of CFT-BRBs in low-rise and high-rise steel buildings.

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ANALYSIS OF THE SEISMIC BEHAVIOR OF INNOVATIVE ALUMINIUM ALLOY ENERGY DISSIPATION BRACES. The Hong Kong Institute of Steel Construction, août 2022. http://dx.doi.org/10.18057/icass2020.p.341.

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In this study the employment of aluminium alloy buckling-restrained braces (ALBRBs) as energy dissipation dampers is attempted for seismic performance upgrading of single layer dome and the effectiveness of ALBRBs to protect structures against strong earthquakes is numerically studied. With buckling restrained, ALBRB members can provide stable energy dissipation capacity and thus damage of the whole structure under major earthquakes can be mitigated. ALBRBs are then placed at certain locations on the example single layer dome to replace some normal members with two schemes, and the effect of the two installation schemes of ALBRBs for seismic upgrading is investigated by non-linear time-history analyses under various ground motions representing major earthquake events. Compared with the seismic behaviour of the original structure without ALBRBs, satisfactory seismic performance is seen in the upgraded models, which clarifies the effectiveness of the proposed upgrading method and it can serve as an efficient solution for earthquake-resistant new designs and retrofit of existing spatial structure.

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