Relevant bibliographies by topics / Dissipative brace

Academic literature on the topic 'Dissipative brace'

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Published: 1 April 2023

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Journal articles on the topic "Dissipative brace"

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Kari, Amir, Mehdi Ghassemieh, and Baitollah Badarloo. "Development and design of a new self-centering energy-dissipative brace for steel structures." Journal of Intelligent Material Systems and Structures 30, no. 6 (February 10, 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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Xie, Qin, Zhen Zhou, Canjun Li, and 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, no. 08 (October 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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Liu, Lu, and Bin Wu. "Self-Centering Buckling-Restrained Braces." Advanced Materials Research 639-640 (January 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, and Angelo Lavino. "A Displacement-Based Design Method for Seismic Retrofit of RC Buildings Using Dissipative Braces." Mathematical Problems in Engineering 2018 (December 27, 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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Grande, Ernesto, and Giampietro Ruotolo. "Design of SMA-Brace Devices for the Seismic Retrofit of Steel CBF." Open Civil Engineering Journal 12, no. 1 (February 15, 2018): 1–20. http://dx.doi.org/10.2174/1874149501812010001.

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Introduction:Retrofit interventions are often performed by introducing in structures dissipative devices able to improve the global seismic response particularly in terms of energy dissipation capacity. In the case of Concentric Braced Steel Frames (CBF), these devices are generally introduced in the form of brace elements made of different materials and based on different dissipation mechanisms. Their design is strictly related to both the characteristics of the selected device and, also, to the own peculiarities of the structural system involved in the retrofit intervention.Methods:The paper presents a simple design approach for the seismic retrofit of non-ductile CBF through the use of Shape Memory Alloys (SMA) brace devices. The approach merges the potentialities of SMA materials and the main peculiarities of the truss-resistant mechanism of CBFs throughout a procedure based on a preliminary phase of assessment, an intermediate phase of requirements evaluation and a final phase of design of the retrofit intervention.Results and Conclusion:After a detailed explanation of the proposed approach, the results derived from non-linear time-history analyses developed with reference to three and five-story CBFs are presented in the paper.
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Tang, Wenke, and Eric M. Lui. "Hybrid Recentering Energy Dissipative Device for Seismic Protection." Journal of Structures 2014 (September 23, 2014): 1–17. http://dx.doi.org/10.1155/2014/262409.

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A hybrid recentering energy dissipative device that has both recentering and energy dissipation capabilities is proposed and studied in this paper. The proposed hybrid device, referred to as the hybrid shape memory alloy (SMA) recentering viscous fluid (RCVF) energy dissipation device, connects the apex of a chevron brace to an adjoining beam using two sets of SMA wires arranged in series on either side of the brace and a viscous fluid damper arranged in parallel with the SMA wires. The viscous damper is used because being a velocity-dependent device it does not exert any force that counteracts the recentering force from the SMA wires after the vibration of the frame ceases. In the numerical study, the Wilde’s SMA constitutive model is used to model the SMA wires, and the Maxwell model is used to simulate the viscous fluid damper. To demonstrate the viability and effectiveness of the proposed hybrid device, comparative studies are performed on several single-story shear frames and a series of four-story steel frames. The results show that the frames equipped with the hybrid device have noticeably smaller peak top story displacements and residual story drifts when subjected to ground motions at three different intensity levels.
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Tirca, Lucia, Nicolae Danila, and Cristina Caprarelli. "Numerical modelling of dissipative pin devices for brace-column connections." Journal of Constructional Steel Research 94 (March 2014): 137–49. http://dx.doi.org/10.1016/j.jcsr.2013.11.007.

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Zhang, Ailin, Quanxi Ye, and Zongyi Wang. "Experimental investigation on behavior of re-centering energy dissipative brace." Engineering Structures 213 (June 2020): 110606. http://dx.doi.org/10.1016/j.engstruct.2020.110606.

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Campiche, Alessia, and Silvia Costanzo. "Evolution of EC8 Seismic Design Rules for X Concentric Bracings." Symmetry 12, no. 11 (October 31, 2020): 1807. http://dx.doi.org/10.3390/sym12111807.

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Eurocodes are currently under revision within a six-year program by CEN/TC 250. In this framework, concentric bracings, particularly in cross configuration, have been largely debated; indeed, several criticisms affect the seismic design procedure currently codified within Eurocode 8, entailing significant design efforts and leading to massive and non-economical structural systems, even characterized by poor seismic behavior. The efforts of SC8 have been aimed at improving the codified seismic design criteria for concentrically braced frames, by providing requirements and detailing rules conceived to simplify the design process and to improve the seismic performance. The current paper provides recent advances in the field of computational and structural engineering focusing on symmetric X concentrically bracings in seismic area, outlining the evolution of Eurocode 8 (EC8) seismic design rules, by examining the following aspects: (i) ductility class and behavior factor, (ii) analysis and modelling aspects, (iii) design of dissipative members; (iv) design of non-dissipative zones; (v) brace-to-frame connections.
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Haddad, Madhar, Tom Brown, and Nigel Shrive. "Experimental cyclic loading of concentric HSS braces." Canadian Journal of Civil Engineering 38, no. 1 (January 2011): 110–23. http://dx.doi.org/10.1139/l10-113.

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During earthquake ground motion, diagonal braces in braced frames are subject to a series of cyclic loadings, alternately tension and compression. The brace can buckle and deform plastically, dissipating energy with damage accumulating in the steel. Eventually a crack may form and the brace fractures. To optimize energy dissipation, the effects of brace and gusset plate dimensions (thickness and length of the gusset plate, size of the brace, length of the brace), and material properties, on brace behaviour, need to be understood. Ten concentric bracing members, designed according to the weak brace – strong gusset concept, were tested. The objective was to investigate the effects of displacement history, brace effective slenderness ratio, and brace width/thickness ratio, on the hysteresis behaviour of bracing members. Displacement history was found to affect energy dissipation and fracture life. The effects of increasing the gusset plate thickness on the energy dissipation and the fracture life is not the same as reducing the effective slenderness ratio of the bracing member resulted from reducing the length of the HSS. New fracture life and energy life equations are proposed.
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Dissertations / Theses on the topic "Dissipative brace"

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Galindo-Lopez, Carlos Hannover. "Optimisation of convective heat dissipation from ventilated brake discs." Thesis, Cranfield University, 2009. http://dspace.lib.cranfield.ac.uk/handle/1826/9196.

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Fast heat dissipation from brake discs is sought in current vehicles, where high power braking duties demand harmonic combination of strength, (undamped) disc mass and cooling abilities for a wide speed range. This work analyses the convective heat dissipation from ventilated brake discs and proposes means for its optimisation. The focus of research is the ventilation geometry of a standard brake disc with an outer diameter of 434mm and radial channels of 101mm in length. After analysing in detail data calculated with CFD simulations and from experimental work for various ventilation patterns, a parameter relating the local channel-averaged convective heat transfer coefficient to channel circumferential width, and radial location was derived. This new numerical parameter termed Flow Index, depicts graphically the link between channel geometry (width and position) to the heat transfer coefficient level attained. The FI was not only used as a tool to analyse the convective performance of conventional and new ventilation geometries, but it also allowed clear identification of changes necessary in the channel width in order to improve its convective heat transfer coefficients. New, optimised for convective heat transfer, ventilation geometries designed with the FI were achieved in this Thesis. Industrial (patenting) and academic applications are foreseen from the results of this Thesis and its future activities. Also, the work developed in this Thesis gives path and supporting frame for future research in the field of brake disc convective heat dissipation.
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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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Premkumar, Daryl. "OPTIMIZATION OF BRAKE PAD GEOMETRY TO PROMOTE GREATER CONVECTIVE COOLING TO INCREASE HEAT DISSIPATION RATE." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2322.

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Despite many research pieces on brake systems, there is still research to be done on brake pad geometry and the dissipation of heat during brake engagements using the finite element analysis method. Brake application is a process in which the kinetic energy of the vehicle is mostly converted into thermal energy and then dissipated in the form of heat. Based on dynamometer test results it was seen that brake pad temperatures could reach up to 600° C [23]. Preliminary research using computer modeling software has shown that heat dissipation in brake pads with wavy geometries and air channels from the top to bottom is much better compared to pads that do not have those specific features. Brake pads that dissipate heat faster are prone to brake fade and other braking issues that may arise due to overheating [15]. For this research, two readily available brake pads and two designs of brake pads with new geometry were modeled using CAE software. Finite element analysis was then performed to test how well each brake pad dissipated heat after reaching brake fade temperatures. The readily available brake pads were from Power Stop and Wagner [26]. ANSYS Space Claim [25] was used to design and model the brake pads, ANSYS 18.2 [24] was used to perform the finite element analysis on the pads. After performing the analysis, results indicate that a brake pad with a design that had zones for turbulent air at ambient conditions and convection slots from the top to the bottom decreased in temperature by about 90° C more in the same time compared to the conventional design. By studying the changing values of the convection heat transfer coefficient with velocity, the placing of the turbulence zones can be more precise in order attain greater airflow to remove heat from the brake pad quicker.
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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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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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Renaud, Franck. "Etude de l'incidence des comportements dissipatifs dans les instabilités vibratoires des systèmes de freinages." Phd thesis, Ecole Centrale Paris, 2011. http://tel.archives-ouvertes.fr/tel-00585269.

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Les instabilités vibratoires, telles que le crissement de frein, sont souvent étudiées par des analyses aux valeurs propres complexes sur des modèles éléments finis (EF). L'objectif de cette thèse est d'enrichir ces modèles en prenant en compte la viscoélasticité dont les effets sont l'amortissement et la rigidification des matériaux en fonction de la fréquence. Pour cela un viscoanalyseur a été développé. Il permet de caractériser en cisaillement les matériaux entre 100 et 3500Hz, sans utiliser les équivalences temps-température. Ce viscoanalyseur permet d'alimenter en paramètres le modèle rhéologique de Maxwell généralisé par le biais d'une nouvelle méthode d'identification particulièrement robuste. Le modèle de Maxwell généralisé est ensuite introduit dans les modèles EF grâce à un modèle d'état projeté sur un sous-espace adéquat. Ces modèles améliorés prédisent moins d'instabilités du fait de l'amortissement, mais ils montrent également que la viscoélasticité peut avoir des effets de déstabilisation du fait de la rigidification.
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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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Yu, You-Sheng, and 於祐生. "Design and Seismic Performance Test of Energy-Dissipative Brace." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/649p2r.

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碩士
國立交通大學
土木工程系所
107
Installation of displacement-dependent structural dampers will increase the stiffness of the entire structure, change its fundamental period and, as a consequence, affect the seismic design load. In light of the fact that design of seismic dampers cannot be independent of the structures, this study develops a damper design procedure that takes into account the structural system as a whole to serve as reference hopefully for practical application. This thesis proposes a two-stage damper design procedure including the preliminary design and detail design. Firstly, the ultimate displacement of the damper is defined in terms of the story-drift ratio of the structure. The yielding displacement of the damper is then calculated by dividing the ultimate displacement with the ductility estimated empirically. Since the maximum story shear occurs always in the first story where the damper tends to yield and be damaged first, damper for the first story are chosen as the design object in this study. The design target is set to be the concurrence of the ultimate displacement of the damper and the story-drift under the seismic design load required by the code. As the seismic design load is related to the fundamental period of structure which in turn is affected by the interaction between the structure and dampers, the initial stiffness of the damper in the preliminary design stage cannot be determined directly. An iterative process therefore is required by first wild guessing an initial stiffness of the damper and updating it iteratively until convergence of the ultimate displacement of the damper to the story-drift of the structure. The corresponding initial stiffness of the damper so determined will be the basis for the detail design of the damper at the next stage. The detail design then is based on the process developed earlier for the in-plane oval damper by the NCTU research team. Moreover, application of the proposed methodology for damper design has been illustrated using a five-story steel modal structure as the object while a series of shake table tests has been conducted accordingly. This thesis explores the seismic performance of the dampers corresponding to different ultimate displacements under El Centro, Chi-Chi and Kobe Earthquakes of various seismic intensities. Simulation results indicate that the seismic performance of the damper is earthquake-dependent that the optimal damper design may vary from one earthquake to another. Upon overall considerations, the ultimate displacement of the damper corresponding to 1% story-drift ratio is selected as the control device for the shaking table tests. The dampers are connected to the structure via H-beam in form of energy-dissipative braces. Results of shaking table tests indicate that, with dampers implemented, significant reductions in acceleration responses for all floors of the structure have been achieved. The control efficiency increases with the intensity of the input excitation as larger responses extend the yielded area of the steel plates and therefore enhance the control effect. The control effect is even more pronounced in terms of the root-mean-square responses (RMS) as the RMS acceleration is proportional to the vibrating energy which is accumulated over the entire earthquake process and reflects better the performance of overall response decay. Simulation analysis is well correlated with the test results, including the proposed damper design methodology is reasonable and the ETABS is reliable as a tool for structural assessment.
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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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Chen, Ying-Chuan, and 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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Book chapters on the topic "Dissipative brace"

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Ma, Cuiling. "Credibility of Estimating the Hysteretic Energy Demands of Concentrically Braced Steel Frames." In 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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Anto, Anjanet, and Asha Joseph. "Seismic Performance Evaluation of Seesaw Braced Energy Dissipation System." In 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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Yin, Zhanzhong, Xiuli Wang, and Xiaodong Li. "Hysteretic Response and Energy Dissipation of Double-Tube Buckling Restrained Braces with Contact Ring." In 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, and Ben Yu Liu. "Damage and Crack Analysis for Reinforced Concrete Energy Dissipation Braced Frame (EDBF) under Low Cyclic Loads." In 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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"Research on steel structures design method using energy dissipation brace for story lateral ductility ratio control." In Modeling and Computation in Engineering II, 153–60. CRC Press, 2013. http://dx.doi.org/10.1201/b14896-24.

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"Parametric study of self-centering concentrically-braced frame systems with friction-based energy dissipation." In Behaviour of Steel Structures in Seismic Areas, 711–16. CRC Press, 2012. http://dx.doi.org/10.1201/b11396-107.

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"A comparative analysis of performances of high strength steel dual frames of buckling restrained braces vs. dissipative shear walls." In 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, and C. Neagu. "A comparative analysis of performances of high strength steel dual frames of buckling restrained braces vs. dissipative shear walls." In Behaviour of Steel Structures in Seismic Areas. CRC Press, 2009. http://dx.doi.org/10.1201/9780203861592.ch21.

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"Optimal design of eccentrically braced frames with vertical link (V-EBFs) in order to maximize energy dissipation." In Behaviour of Steel Structures in Seismic Areas, 393–98. CRC Press, 2009. http://dx.doi.org/10.1201/9780203861592-63.

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Taherkhani, S., A. Rezaeian, and F. Hamedi. "Optimal design of eccentrically braced frames with vertical link (V-EBFs) in order to maximize energy dissipation." In Behaviour of Steel Structures in Seismic Areas. CRC Press, 2009. http://dx.doi.org/10.1201/9780203861592.ch53.

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Conference papers on the topic "Dissipative brace"

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Erochko, J., C. Christopoulos, and R. Tremblay. "DETAILED COMPONENT MODELLING OF A SELF-CENTERING ENERGY DISSIPATIVE BRACE SYSTEM." In 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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Tsai, Chong-Shien, and Yan-Ming Wang. "Experimental Study of All-Steel Buckling Restrained Brace With Windowed Lateral Support Elements." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28250.

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The buckling restrained brace (BRB) that has been worldwide adopted as a structural control device possesses excellent energy dissipation mechanism and can overcome the disadvantages of the traditional brace. However, the traditional BRB is a fully close design, it is therefore impossible to inspect the condition of the internal components during manufacturing and after earthquakes. This study proposed an all-steel buckling restrained brace with windowed lateral support elements that allow inspecting the internal condition of the BRB. We also studied the optimization in selecting the sizes and positions of the windows in the internal components without affecting its strength to provide an economically feasible all-steel BRB that is convenient for manufacturing and installation and meets the rigorous testing protocols. The all-steel BRB consists of the steel core, lateral support and constraining elements. In this study, scaled all-steel BRBs were tested under cyclic loadings by using an MTS 250 kN test machine. Test results showed that the mechanical behavior of the BRB with windows on the sides of lateral support elements is stable and that damage always occurred at the energy dissipation sections after low cycle fatigue tests. The difference between tensile and compressive forces was small under identical strain, and the accumulated inelastic deformation exceeded the requirement of test protocols. These test results confirm that the windows opened on the proposed BRB have insignificant effects on the strength of the device and that the proposed device meets the design requirement and is thus considered as a stable energy dissipative apparatus.
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Erochko, J., and C. Christopoulos. "Self-Centering Energy-Dissipative (SCED) Brace: Overview of Recent Developments and Potential Applications for Tall Buildings." In International Conference on Sustainable Development of Critical Infrastructure. Reston, VA: American Society of Civil Engineers, 2014. http://dx.doi.org/10.1061/9780784413470.053.

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Nuzzo, Iolanda. "CASE-STUDY OF A COST-BASED SEISMIC DESIGN FOR A R.C. FRAME WITH ADDITIONAL DISSIPATIVE BRACE SYSTEMS." In 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering 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, 2019. http://dx.doi.org/10.7712/120119.7152.19266.

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Thibault, Pierre, Charles-Darwin Annan, and Pampa Dey. "Investigation of hybrid multi-core buckling-restrained brace components." In 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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<p>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.</p>
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Kanehira, Yasuyuki, Yusuke Aoki, and Yukio Nishizawa. "Evaluation of an Energy Dissipation Mechanism by Friction for Brake Shims." In Brake Colloquium & Exhibition - 35th Annual. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2017. http://dx.doi.org/10.4271/2017-01-2487.

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Tsai, C. S., Yi Liu, and B. Q. Liu. "Buckling Restrained Brace With Inspection Windows." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45110.

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The buckling restrained brace (BRB) has been worldwide recognized as an energy absorber to protect structures from earthquake damage. However, the traditional BRB is a fully close design, it is therefore impossible to detect the condition of the steel core during manufacturing and after earthquakes. This paper proposed a buckling restrained brace with inspection windows that allow inspecting the condition of the internal components of the BRB. Experimental study in selecting the sizes and locations of the inspection windows without affecting the functionality of the BRB has been carried out to search for an economically feasible BRB that is convenient for manufacturing and installation and meets testing protocols. Test results of the proposed BRBs under cyclic loadings showed that the mechanical behavior of the BRB with inspection windows on the buckling-restraining unit consisting of the constraining and lateral support elements was stable and that damage always occurred at the energy dissipation segments after low cycle fatigue tests. These test results indicate that the inspection windows opened on the proposed BRB have little influence on the strength of the device and that the proposed device can be considered as a stable energy dissipation device.
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Garello, Giulia, Niccolò Patron, Pietro Buonfico, and Luca Martinotto. "Real Scale Dyno Bench Study on the Relation between Kinetic Energy Dissipation and Friction Material Wear." In SAE Brake Colloquium & Exhibition - 33rd Annual. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2015. http://dx.doi.org/10.4271/2015-01-2692.

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Ran, Longlin, Wenhong Hou, Huitie Liu, Jinli Qiao, and Shuang Hou. "Study on Seismic Behavior for Viscous energy dissipation brace Concrete Frame Joints." In 5th International Conference on Civil Engineering and Transportation. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/iccet-15.2015.11.

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Nastri, Elide. "ECCENTRICALLY BRACED FRAMES DESIGNED FOR THE ENERGY DISSIPATION OPTIMIZATION." In 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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Reports on the topic "Dissipative brace"

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FEASIBILITY STUDY OF VISCOELASTIC HYBRID SELF-CENTERING BRACE (VSCB) FOR SEISMIC-RESISTANT STEEL FRAMES. The Hong Kong Institute of Steel Construction, August 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, August 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, March 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, December 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, August 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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