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Seismic Risk Reduction of Reinforced Concrete Buildings Retrofitted with Steel Braces.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Seismic Risk Reduction of Reinforced Concrete Buildings Retrofitted with Steel Braces./
作者:	Moreira, Rodrigo Esmeriz Falcao.
面頁冊數:	1 online resource (631 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-07, Section: B.
Contained By:	Dissertations Abstracts International84-07B.
標題:	Fatalities. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30221521click for full text (PQDT)
ISBN:	9798363576256

Seismic Risk Reduction of Reinforced Concrete Buildings Retrofitted with Steel Braces.
Moreira, Rodrigo Esmeriz Falcao.

Seismic Risk Reduction of Reinforced Concrete Buildings Retrofitted with Steel Braces. - 1 online resource (631 pages)

Source: Dissertations Abstracts International, Volume: 84-07, Section: B.

Thesis (Ph.D.)--Universidade do Porto (Portugal), 2022.

Includes bibliographical references

During a violent earthquake, the damage and collapse of buildings, infrastructures, and other equipment - not the earthquake by itself - are responsible for the most extensive human and economic losses. This means that the so-called seismic catastrophes are not exactly natural, but in fact mainly caused by man-made surroundings. Fortunately, it also means that, while seismic hazard is determined by Nature, the vulnerability and exposure of the built environment are humanly determined parameters that, as such, can be controlled and reduced. It is therefore essential that research in earthquake engineering is also directed towards assessing the vulnerability of the existing building stock and the development of retrofitting techniques, so that the effects of future seismic events (human casualties and economic losses) can be mitigated.The final purpose of this study is to contribute to the reduction of the seismic risk to which the Portuguese RC building stock is exposed. As the worldwide experience from past and present seismic activity shows that non-ductile RC frame buildings are (by far) one of the most vulnerable, these pose a large threat to human life and property in future earthquakes. Within this context, motivated by the known benefits of using steel braces to reinforce RC frame buildings, as well as by the fact that in Portugal there are almost no application examples, the first objective of this thesis is to improve knowledge on the seismic behaviour of such retrofitted structures, directly considering the main characteristics of the building classes that exist in the country. Afterwards, given the limitations of conventional seismic design methodologies when applied to hybrid RC-steel systems, the second objective is to propose a displacement-based design procedure, applicable to steel X-brace retrofitting systems for RC frame buildings, and demonstrate it is robust enough to be applied systematically by practitioners involved in such matters.As background, a general overview of several topics involved in the seismic assessment and retrofitting of existing RC buildings is provided. A review of past studies on seismic risk in mainland Portugal and on the characterization of the Portuguese RC building stock, along with a discussion of the typical causes of damage and failure, are also included. The nonlinear modelling of RC frames under cyclic loading is addressed, as well as the applicable analysis methods. The current codes and guidelines are reviewed, with special emphasis on the methodology defined by EC8-3 (2005), the common practice among structural design professionals, and the simplified methods introduced by the LNEC Report 81/2019 (Sousa et al, 2019). Finally, the available steel-based retrofitting techniques for RC frames are reviewed, as well as the most relevant past studies on the seismic behaviour and design of RC buildings retrofitted with steel X-braces.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798363576256Subjects--Topical Terms:

3681792
Fatalities.
Index Terms--Genre/Form:

542853
Electronic books.

Seismic Risk Reduction of Reinforced Concrete Buildings Retrofitted with Steel Braces.
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500 $a Source: Dissertations Abstracts International, Volume: 84-07, Section: B.
500 $a Advisor: de Freitas Castro, Jose Miguel; Varum, Humberto Salazar Amorim; Marques, Mario Antonio Lage Alves.
502 $a Thesis (Ph.D.)--Universidade do Porto (Portugal), 2022.
504 $a Includes bibliographical references
520 $a During a violent earthquake, the damage and collapse of buildings, infrastructures, and other equipment - not the earthquake by itself - are responsible for the most extensive human and economic losses. This means that the so-called seismic catastrophes are not exactly natural, but in fact mainly caused by man-made surroundings. Fortunately, it also means that, while seismic hazard is determined by Nature, the vulnerability and exposure of the built environment are humanly determined parameters that, as such, can be controlled and reduced. It is therefore essential that research in earthquake engineering is also directed towards assessing the vulnerability of the existing building stock and the development of retrofitting techniques, so that the effects of future seismic events (human casualties and economic losses) can be mitigated.The final purpose of this study is to contribute to the reduction of the seismic risk to which the Portuguese RC building stock is exposed. As the worldwide experience from past and present seismic activity shows that non-ductile RC frame buildings are (by far) one of the most vulnerable, these pose a large threat to human life and property in future earthquakes. Within this context, motivated by the known benefits of using steel braces to reinforce RC frame buildings, as well as by the fact that in Portugal there are almost no application examples, the first objective of this thesis is to improve knowledge on the seismic behaviour of such retrofitted structures, directly considering the main characteristics of the building classes that exist in the country. Afterwards, given the limitations of conventional seismic design methodologies when applied to hybrid RC-steel systems, the second objective is to propose a displacement-based design procedure, applicable to steel X-brace retrofitting systems for RC frame buildings, and demonstrate it is robust enough to be applied systematically by practitioners involved in such matters.As background, a general overview of several topics involved in the seismic assessment and retrofitting of existing RC buildings is provided. A review of past studies on seismic risk in mainland Portugal and on the characterization of the Portuguese RC building stock, along with a discussion of the typical causes of damage and failure, are also included. The nonlinear modelling of RC frames under cyclic loading is addressed, as well as the applicable analysis methods. The current codes and guidelines are reviewed, with special emphasis on the methodology defined by EC8-3 (2005), the common practice among structural design professionals, and the simplified methods introduced by the LNEC Report 81/2019 (Sousa et al, 2019). Finally, the available steel-based retrofitting techniques for RC frames are reviewed, as well as the most relevant past studies on the seismic behaviour and design of RC buildings retrofitted with steel X-braces.
520 $a Durante um evento sismico violento, os danos e colapsos de edificios, infraestruturas, e outros equipamentos - nao o sismo per se - sao responsaveis pelas perdas humanas e economicas mais extensas. Isto significa que as chamadas "catastrofes sismicas" nao sao propriamente naturais, mas na realidade essencialmente causadas por envolventes criadas pelo Homem. Felizmente, isto tambem significa que, embora a perigosidade sismica seja determinada pela Natureza, a vulnerabilidade e exposicao do ambiente construido sao parametros humanamente determinados que, como tal, podem ser controlados e reduzidos. Por conseguinte, e essencial que a investigacao em Engenharia Sismica seja tambem orientada para a avaliacao da vulnerabilidade do parque edificado, assim como para o desenvolvimento de tecnicas de reforco estrutural, para que os efeitos de eventos sismicos futuros (baixas humanas e perdas economicas) possam ser mitigados.O objetivo final deste estudo e contribuir para a reducao do risco sismico a que esta exposto o parque edificado de betao armado (BA) em Portugal. Mostrando a experiencia mundial, adquirida em eventos sismicos passados e recentes, que os edificios nao-ducteis em betao armado sao (de longe) dos mais vulneraveis, estes representam uma grande ameaca para a vida e propriedade humanas em eventos sismicos futuros. Neste contexto, motivado pelos conhecidos beneficios da utilizacao de contraventamentos metalicos para reforcar edificios de BA, bem como pelo facto de em Portugal quase nao existirem exemplos de aplicacao, o primeiro objetivo desta tese e melhorar o conhecimento sobre o comportamento de tais estruturas reforcadas, considerando diretamente as principais caracteristicas das classes de edificios que existem no pais. Em seguida, dadas as limitacoes das metodologias convencionais de dimensionamento sismico quando aplicadas a sistemas hibridos aco-betao, o segundo objetivo e propor um processo de dimensionamento baseado em deslocamentos, aplicavel a sistemas de reforco constituidos por contraventamentos em X para edificios de BA, e demonstrar que e suficientemente robusto para ser aplicado sistematicamente por profissionais envolvidos nestas materias.Como base, e oferecida uma visao geral sobre varios topicos relacionados com a avaliacao de seguranca e reforco sismico de edificios de BA. Uma revisao de estudos anteriores sobre risco sismico em Portugal Continental e sobre a caracterizacao do seu parque edificado de BA, assim como uma discussao sobre causas tipicas de colapso, estao tambem incluidas. A modelacao nao-linear de porticos de BA sujeitos a carregamento ciclico e abordada, bem como os metodos de analise aplicaveis. Os regulamentos e orientacoes atuais sao revistos, com especial enfase na metodologia definida pelo EC8-3 (2005), naquilo que e a pratica comum entre profissionais, e nos metodos simplificados introduzidos pelo Relatorio LNEC 81/2019 (Sousa et al, 2019). Finalmente, sao revistas as tecnicas de reforco com estrutura metalica disponiveis para edificios de BA, bem como os estudos anteriores mais relevantes sobre comportamento sismico e dimensionamento de edificios de BA reforcados com contraventamentos em X.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Fatalities. $3 3681792
650 4 $a Built environment. $3 3634048
650 4 $a Masonry. $3 685951
650 4 $a Design. $3 518875
650 4 $a Earthquakes. $3 535233
650 4 $a Seismic engineering. $3 3561056
650 4 $a Reinforced concrete. $3 861675
650 4 $a Performance evaluation. $3 3562292
650 4 $a Building construction. $3 2071835
650 4 $a Composite materials. $3 654082
650 4 $a Civil engineering. $3 860360
650 4 $a Geophysics. $3 535228
650 4 $a Materials science. $3 543314
655 7 $a Electronic books. $2 lcsh $3 542853
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690 $a 0467
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710 2 $a Universidade do Porto (Portugal). $3 3348738
773 0 $t Dissertations Abstracts International $g 84-07B.
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