COMPARATIVA ENTRE SISTEMA CONSTRUTIVO LIGHT STEEL FRAMING E SISTEMA CONVENCIONAL EM CONCRETO ARMADO ALIADO A BLOCOS CERÂMICOS

Author(s):  
Marcos Antonio Barros ATAIDE ◽  
Marlyson José Silveira BORGES
Keyword(s):  
2018 ◽  
Vol 64 (2) ◽  
pp. 111-146
Author(s):  
A.M Barszcz

AbstractThis paper deals with a Continuous Stiffness Degradation (CSD) version of advanced analysis of braced steel framing. It is based on the gradual stiffness degradation concept of frame and truss members. A novelty of the approach presented herein is related to the introduction of the bracing member response in the whole range of its behaviour in tension and compression, including the post-limit range. The validation of the proposed advanced analysis is performed for braced framework with rolled angle section braces. The validation of the brace force-deformation model has been presented in the author’s earlier publication. The basis for the presented CSD advanced analysis is briefly summarized and its difference with regard to the Refined Plastic Hinge (RPH) version of advanced analysis is emphasized. Experimental investigations dealing with tests on portal braced sub-frame specimens are referred to briefly. Results of the experimental investigations are presented in the form of a frame global response and they are used for the validation of the developed computational model.


Author(s):  
Bárbara Holzmann Mass ◽  
Sergio Fernando Tavares
Keyword(s):  

A construção civil é uma atividade grande geradora de impactos ambientais devido a fatores como: elevado consumo de recursos naturais, poluição ambiental, grande consumo de energia, alto índice de perdas e desperdícios, e geração de resíduos. No Brasil, ela é, em sua maioria, baseada em técnicas construtivas consideradas tradicionais e que acarretam grande consumo de matéria-prima e elevados índices de perdas. Um exemplo é a alvenaria de tijolos convencional que, apesar de muito utilizada, se prova ineficiente do ponto de vista ambiental, devendo ser substituída por outras tecnologias mais eficientes. A literatura técnica, neste sentido, aponta o Light Steel Framing (LSF) como uma alternativa para esta situação. Assim, esta pesquisa objetiva estimar a quantidade de resíduos de construção civil (RCC) gerados na construção de uma edificação padrão concebida em LSF em comparação com uma em alvenaria convencional. Para tal, foi concebido um experimento de campo a partir do acompanhamento da obra de uma edificação residencial de pequeno porte construída em LSF no município de Ponta Grossa/PR, e sobre a qual foi simulada a mesma construção em alvenaria convencional, utilizando-se dados da literatura técnica.  O acompanhamento da obra original em LSF indica um total de materiais adquiridos de 42,64t contra 114,23t da simulação em alvenaria convencional. Além disso, as quantidades de resíduos geradas foram de 5,51t (0,095t/m²) e 35,84t (0,616t/m²), respectivamente. Os resultados mostram que a edificação construída em LSF, além de ser muito mais leve, gera uma quantidade de resíduos muito menor e possui menos da metade do índice de perdas do que a mesma se construída em alvenaria convencional, indicando claros atributos de sustentabilidade.


2018 ◽  
Vol 763 ◽  
pp. 3-10 ◽  
Author(s):  
Gregory A. MacRae ◽  
George Charles Clifton ◽  
Michel Bruneau

Over the past few years, the South Island of New Zealand has been subject to significant sequences of earthquake shaking. In particular, 2010-2011 events affected the city of Christchurch resulting in large scale demolition of buildings. Also, the recent and continuing 11/2016 events caused severe damage in the countryside, in small towns, and moderate damage further afield. This paper describes “low damage construction” methods being used in NZ, and especially in the Christchurch rebuild, to limit the possibility of building demolition in future large seismic events. The buildings used in the Christchurch rebuild are generally supported by structural steel framing. These steel buildings include BRB systems, EBF systems with replaceable active links, rocking systems, base isolation using friction pendulum systems and/or lead-rubber dissipaters, RBS beams, lead extrusion dissipaters, yielding flexural dissipaters, and friction connections. Concerns about a number of currently used systems are discussed.


Author(s):  
Thomas Spoth ◽  
Seth Condell

<p>The Port Authority of New York and New Jersey has completed the replacement of the congested and functionally obsolete Goethals Bridge, a circa 1928 steel cantilever truss bridge, with a dual-span modern cable-stayed bridge connecting Elizabeth, New Jersey and Staten Island, NY. Designed as a 150 year service life structure, the newly opened crossing paves the way towards achieving the possibility of a 200 year bridge, both in material durability, structural redundancy / resilience, and modal flexibility.</p><p>The new crossing features three eastbound and three westbound lanes plus a 3 m wide shared use path (SUP) for bicycles and pedestrians. To accommodate future expansion, the superstructure of the cable stayed spans is designed to receive steel framing to support a variety of possible transit options including light rail, while the substructure need not be strengthened for this future load. With a 274 m main span, the new crossing provides a significant maritime navigational improvement over the original 205 m steel truss span.</p><p>Herein we focus on the strategic application of corrosion protection strategies to achieve the long service life in a competitive bid environment, structural benefit of the design as relates to resiliency, modal flexibility, and operational redundancy to withstand extreme events.</p>


2009 ◽  
pp. 159-159-17
Author(s):  
TW Petrie ◽  
J Kśsny ◽  
JA Atchley ◽  
AO Desjarlais

2018 ◽  
Vol 132 ◽  
pp. 771-782 ◽  
Author(s):  
Hanheng Wu ◽  
Sisi Chao ◽  
Tianhua Zhou ◽  
Yunxiao Liu

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Yeong Huei Lee ◽  
Cher Siang Tan ◽  
Shahrin Mohammad ◽  
Mahmood Md Tahir ◽  
Poi Ngian Shek

The concept of cold-formed light steel framing construction has been widespread after understanding its structural characteristics with massive research works over the years. Connection serves as one of the important elements for light steel framing in order to achieve its structural stability. Compared to hot-rolled steel sections, cold-formed steel connections perform dissimilarity due to the thin-walled behaviour. This paper aims to review current researches on cold-formed steel connections, particularly for screw connections, storage rack connections, welded connections, and bolted connections. The performance of these connections in the design of cold-formed steel structures is discussed.


2010 ◽  
Vol 3 (3) ◽  
pp. 163-168
Author(s):  
Vitor Murtinho ◽  
Helder Ferreira ◽  
António Correia ◽  
Lu&&nums Simões da Silva ◽  
Helena Gervásio ◽  
...  

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