Seismic testing and performance of buckling-restrained bracing systems

2006 ◽  
Vol 33 (2) ◽  
pp. 183-198 ◽  
Author(s):  
R Tremblay ◽  
P Bolduc ◽  
R Neville ◽  
R DeVall
Keyword(s):  
Energy Dissipation ◽  
Dynamic Loading ◽  
Static Loading ◽  
Low Cycle Fatigue ◽  
The Core ◽  
Applied Loading ◽  
Axial Forces ◽  
Concentrically Braced ◽  
And Performance ◽  
Brb System

This paper describes a subassemblage seismic test program performed on six buckling-restrained braces (BRBs). Two different brace core segment lengths and two different buckling-restraining mechanisms were examined. The applied loading histories included a qualifying quasi-static cyclic test with stepwise incremental displacement amplitudes and a dynamically applied seismic loading. A test was also carried out on a conventional bracing member for comparison purposes. The concrete-filled tube specimens exhibited satisfactory performance under the quasi-static loading protocol, regardless of the length of the core segment. Strain hardening and frictional responses resulted in brace axial forces significantly exceeding the core yield capacity. The steel BRB system exhibited good performance under the quasi-static and dynamic loading sequences, provided that the clearance between the brace core and the buckling-restrained mechanism was kept to a minimum. The dynamic loading protocol was less severe for low-cycle fatigue than the quasi-static loading, but higher strain rates resulted in amplified yield resistance. The conventional bracing member withstood the entire quasi-static loading history but exhibited limited energy-dissipation capacity compared with the concrete-filled BRBs.Key words: concentrically braced steel frames, bracing members, buckling, energy dissipation, friction, yielding, fracture, seismic.

Low-Cycle Fatigue Performance of Buckling Restrained Braces and Assessment of Cumulative Damage under Severe Earthquakes

2018 ◽  
Vol 763 ◽  
pp. 867-874
Author(s):  
Yu Shu Liu ◽  
Ke Peng Chen ◽  
Guo Qiang Li ◽  
Fei Fei Sun
Keyword(s):  
Fatigue Life ◽  
Energy Dissipation ◽  
Structural Reliability ◽  
Low Cycle Fatigue ◽  
Engineering Application ◽  
Fatigue Performance ◽  
Cycle Fatigue ◽  
Variable Amplitude ◽  
Buckling Restrained Braces ◽  
Energy Dissipation Devices

Buckling Restrained Braces (BRBs) are effective energy dissipation devices. The key advantages of BRB are its comparable tensile and compressive behavior and stable energy dissipation capacity. In this paper, low-cycle fatigue performance of domestic BRBs is obtained based on collected experimental data under constant and variable amplitude loadings. The results show that the relationship between fatigue life and strain amplitude satisfies the Mason-Coffin equation. By adopting theory of structural reliability, this paper presents several allowable fatigue life curves with different confidential levels. Besides, Palmgren-Miner method was used for calculating BRB cumulative damages. An allowable damage factor with 95% confidential level is put forward for assessing damage under variable amplitude fatigue. In addition, this paper presents an empirical criterion with rain flow algorithm, which may be used to predict the fracture of BRBs under severe earthquakes and provide theory and method for their engineering application. Finally, the conclusions of the paper were vilified through precise yet conservative prediction of the fatigue failure of BRB.

Construction of MOFs-Shell Porous Materials and Performance Study in Selective Adsorption and Separation of Benzene Pollutants

2021 ◽  
Author(s):  
Yu Qiao ◽  
Na Lv ◽  
Dong Li ◽  
Hongji Li ◽  
Xiangxin Xue ◽  
...  
Keyword(s):  
Porous Materials ◽  
Shell Structure ◽  
Selective Adsorption ◽  
Core Shell ◽  
Architecture Design ◽  
Performance Study ◽  
The Core ◽  
Core Shell Structure ◽  
And Performance ◽  
Sacrificial Agent

Metastable Cu2O is an attractive material for the architecture design of integrated nanomaterials. In this context, Cu2O was used as the sacrificial agent to form the core-shell structure of Cu2O@HKUST-1...

Mechanical Energy Dissipation and Performance in Alpine Ski Racing

2008 ◽  
Vol 40 (Supplement) ◽  
pp. S165 ◽  
Author(s):  
Robert Reid ◽  
Matthias Gilgien ◽  
Tron Moger ◽  
Håvard Tjørhom ◽  
Per Haugen ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Mechanical Energy ◽  
Mechanical Energy Dissipation ◽  
And Performance

scholarly journals Getting To The Core:

2020 ◽  
Vol 18 (1) ◽  
pp. 73-83
Author(s):  
Marie-Anne Kohl
Keyword(s):  
Cultural Studies ◽  
North American ◽  
Song Cycle ◽  
American Identity ◽  
The Core ◽  
Specific Concept ◽  
And Performance

This article discusses the construction and representation of nature in the composition and performance of Meredith Monk’s song cycle “Facing North” by analyzing the quality of the performing voices, their physicality, and by bringing them into relation to the associations and contexts evoked by the songs’ titles. Based on voice and nature concepts in cultural studies, this article argues that this approach creates a very specific concept of nature, which is artistic and artificial at the same time. Through contextualising the concept of nature established in “Facing North” with a specific, gendered construction of nature as basis of a narrative of North American identity as depicted by musicologist Denise Von Glahn, it becomes evident how the composition and performance of “Facing North” at once accord with and oppose to a gendered concept of nature.

scholarly journals Diversification, Branding, and Performance of Professional Service Firms

2018 ◽  
Vol 21 (3) ◽  
pp. 353-364 ◽  
Author(s):  
Carolina Castaldi ◽  
Marco S. Giarratana
Keyword(s):  
Service Providers ◽  
Professional Service ◽  
Panel Regression ◽  
Service Firms ◽  
Professional Service Firms ◽  
Specific Product ◽  
The Core ◽  
Time Period ◽  
Consulting Firms ◽  
And Performance

This article analyzes the effects of diversification and brand breadth on firm performance for professional service firms (PSFs). The research aim is two-fold. First, we test whether moving into products may put at risk the core resources that sustain PSFs’ competitive advantage. Second, we study which branding strategies best match their diversification attempts. Broad (narrow) brands characterize a branding strategy with scarce (plentiful) associations to specific product characteristics. We analyzed trademark portfolios of 47 U.S.-based management consulting firms in the 2000 to 2009 time period. Panel regression results suggest that (1) PSFs always benefit from diversification when they remain pure-service providers; (2) performance is positively related to a strategy of specialized narrow brands.

Agents of peace: place, identity and peacebuilding

2018 ◽  
Author(s):  
Gëzim Visoka
Keyword(s):  
Place Identity ◽  
Critical Hermeneutics ◽  
The Core ◽  
Post Conflict ◽  
Everyday Practices ◽  
Sustainable Peace ◽  
Different Types ◽  
Nuanced Understanding ◽  
And Performance ◽  
Modes Of Governance

This chapter provides a new account of identity and practices of agents in the context of post-conflict peacebuilding. It investigates how place, habitus, and fields of interaction alongside the performative roles shape the identity of agents and their socialization in practice. To explore the relation between the agents’ presence and their impact on peacebuilding, this paper bypasses the exclusionary dichotomies between local/international and liberal/indigenous agents, and develops a typology of six types of agents horizontally arranged around their insideness and outsideness towards a particular conflict-affected place. Using human geography and critical hermeneutics, this paper categorises ‘agents of peace’ in six different types: existential insiders, subjective insiders, empathetic insiders, behavioural insiders, objective outsiders, and existential outsiders. The core argument of this article is that the differentiation of agents around the geographical and performance towards a particular place facilitates the exploration of pluralist forms of agency and a more nuanced understanding of dynamics in post-conflict societies. An expanded and plural view of agents captures better the fields of interaction and hybridization, agential knowledge and narratives, modes of governance, and various everyday practices that enable or inhibit sustainable peace.

Information Filtering and Personalization Services

2005 ◽  
pp. 76-96 ◽  
Author(s):  
Chunxiao Xing ◽  
Chun Zeng ◽  
Zhiqiang Zhang ◽  
Lizhu Zhou
Keyword(s):  
Digital Libraries ◽  
Information Filtering ◽  
Vector Space Model ◽  
Research Area ◽  
User Interests ◽  
The Core ◽  
Personalized Services ◽  
Key Technologies ◽  
Similarity Computation ◽  
And Performance

Personalization service is becoming one of the core services in digital libraries, and an exciting and challenge research area. In this chapter, we analyze several key technologies and the related works in information filtering and personalized services, and then present a content-based personalized searching algorithm and a probabilistic model to represent user interests, which is more effective than the vector space model by the experiments. To solve the data sparsity and scalability problems in collaborative filtering, we present new methods for similarity computation and instance selection. The experiments show it is higher predicted precision and performance than the others. Based on the above research results, we design and develop a prototype, TH-PASS, which provides personalized searching and recommending services.

scholarly journals The Call to Play: New Work and Labor at Artsadmin

2020 ◽  
Vol 61 (2) ◽  
pp. 252-271
Author(s):  
Elyssa Livergant
Keyword(s):  
Sound Art ◽  
The Other ◽  
Visual Performance ◽  
New Work ◽  
Central Figure ◽  
Experimental Art ◽  
The Core ◽  
Labor Practices ◽  
And Performance

February 2010. The lights are off. As I adjust to the dark I can make out shapes of others scattered around the room. Disoriented and uncertain I wait for some sign or direction of what to do. The air is thick with anticipation, but as time drags it becomes clear that no instructions are coming. Then it begins all around me. Sat in the dark in a workshop in the courtroom studio of Toynbee Studios, I begin to feel anxious. I see the outline of another body in front of me and I panic. I should do something. I reach for anything that might keep things working, that might keep play going. Does anyone want to dance, I ask. I waltz. I sense someone dancing behind me.In what follows I think through my participation in a 2010 workshop led by Anne Bean, recounted in part above, to understand better the role of play in the conditions of production for theatre and performance under capital. Bean is an interdisciplinary artist, belonging to (or claimed by) multiple experimental art scenes, including visual, performance, and sound art, who has been a central figure of European live art since the 1970s. The workshop, which was conducted largely in the dark and focused on the aestheticization of cooperation through an emphasis on its participants doing play was held at Artsadmin's Toynbee Studios, the influential UK arts producing organization's home in East London. This article puts my account of Bean's workshop in conversation with Victorian economist Arnold Toynbee's demand for a new capitalist morality. Toynbee's appeal was, of course, not directed at me or the other workshop participants disoriented and uncertain in the dark. But, I argue, the situation of play that arose in Bean's workshop is a contemporary iteration of what Toynbee called a gospel of life, a term referring to a commitment to self and civic betterment at the core of a burgeoning capitalist morality. The connection between the shaping of Victorian labor practices and the staging of cooperation between participants in Bean's contemporary workshop is the basis for this essay's core assertion: that the value of play as a counterpoint to work within practices and discourses of theatre and performance needs considerable rethinking.

Parametric Study of Low-Ductility Concentrically Braced Frames under Cyclic Static Loading

2017 ◽  
Vol 143 (6) ◽  
pp. 04017032 ◽  
Author(s):  
Joshua G. Sizemore ◽  
Larry A. Fahnestock ◽  
Eric M. Hines ◽  
Cameron R. Bradley
Keyword(s):  
Parametric Study ◽  
Static Loading ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Concentrically Braced
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