Prefabricated hybrid steel wall panels for mid-rise construction in seismic regions

Mortazavi, Mina; Sharafi, Pezhman; Kildashti, Kamyar; Samali, Bijan

doi:10.1016/j.jobe.2019.100942

Cited by 16 publications

(4 citation statements)

References 32 publications

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“…The research involved an extensive dynamic testing program to assess the contributions from the non-structural components, particularly the plasterboard lining. The results of this study and some other similar studies show that non-structural components, such as plasterboard lining, make a significant contribution to the lateral bracing of the frames [17][18][19][20][21].…”

Section: Of 18supporting

confidence: 71%

Operational Modal Analysis, Testing and Modelling of Prefabricated Steel Modules with Different LSF Composite Walls

et al. 2020

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The modal properties of modular structures, such as their natural frequencies, damping ratios and mode shapes, are different than those of conventional structures, mainly due to different structural systems being used for assembling prefabricated modular units onsite. To study the dynamic characteristics of modular systems and define a dynamic model, both the modal properties of the individual units and their connections need to be considered. This study is focused on the former aspect. A full-scale prefabricated volumetric steel module was experimentally tested using operational modal analysis technique under pure ambient vibrations and randomly generated artificial hammer impacts. It was tested in different situations: [a] bare (frame only) condition, and [b] infilled condition with different configurations of gypsum and cement-boards light-steel framed composite walls. The coupled module-wall system was instrumented with sensitive accelerometers, and its pure and free vibration responses were synchronously recorded through a data acquisition system. The main dynamic characteristics of the module were extracted using output-only algorithms, and the effects of the presence of infill wall panels and their material are discussed. Then, the module’s numerical micromodel for bare and infilled states is generated and calibrated against experimental results. Finally, an equivalent linear strut macro-model is proposed based on the calibrated data. The contribution of this study is assessing the effects of different infill wall materials on the dynamic characteristics of modular steel units, and proposing simple models for macro-analysis of infilled module assemblies.

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Section: Of 18supporting

confidence: 71%

Operational Modal Analysis, Testing and Modelling of Prefabricated Steel Modules with Different LSF Composite Walls

et al. 2020

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“…To avoid disproportionate collapse, a robust structure should be able to tolerate the local failure and provide alternate load paths (ALPs) by means of adequate tying action between the elements of the construction to transfer the released load to intact neighboring elements. [29] Therefore, structural robustness strongly depends on redundancy, which is the ability of a structure to redistribute loads. However, the neighboring elements may fail, if they cannot withstand the increased imposed loading.…”

Section: Robustness Of Corner-supported Msbsmentioning

confidence: 99%

Robustness of multistory corner‐supported modular steel frames against progressive collapse

Alembagheri

Sharafi

Tao

et al. 2021

Structural Design Tall Build

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In current practice, a relatively wide range of different interconnections and assembly systems is being used for the design of modular buildings made of volumetric prefabricated frames. The integration strategies and design criteria for providing structural robustness or prevention of disproportionate collapse for such buildings are completely different with those with conventional systems. This is mainly because of their fundamentally different configuration of joints and the redundancy they provide for the structure. This paper studies the robustness of multistory modular structures, made of prefabricated volumetric steel frames, against progressive collapse, which can be triggered by various column or module loss scenarios. In this study, the flexibility of modules and propagation of the damage inside the individual modules are taken into account, and the buckling of columns, as well as the effects of material nonlinearity on the responses and capacity of the entire system, are also considered.Load redistribution patterns and possible gravity-induced collapse mechanisms are inspected in various collapse scenarios for a typical mid-rise modular steel frame. In the numerical model, each individual prefabricated volumetric module is composed of discrete beam and column frame elements, connected through conventional rigid beam-column connections. The volumetric modular steel frames are connected via corner vertical and horizontal intermodule joints; each one is modeled utilizing one axial and two shear springs with predefined nonlinear force-displacement behavior in a 3D finite element analysis. The local damage scenarios are assumed to be due to instantaneous loss of columns or entire modules, for which the interactions between the modular units, overall structural robustness, load redistribution, possible collapse mechanisms, and progressive collapse response of the frames are investigated. The results indicate that the additional redundancy may help the modular steel frames survive from some corner column or single module removals but will not be able to maintain their robustness under combined module removal scenarios.

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“…Segundo Usefi , Sharafi e Ronagh (2019) o Light Steel Framing (LSF) é um sistema construtivo autoportante constituído por perfi s leves de aço galvanizado formados a frio, permitindo que a construção seja feita de forma racional, com poucos resíduos de obra e de forma rápida, em comparação com os edifícios em concreto armado e alvenaria. Atualmente o sistema é comumente empregado em países onde a construção civil é predominantemente industrializada (MORTAZAVI et al, 2020). O Brasil ocupa o nono lugar no ranking mundial entre os dez maiores produtores de aço no mundo (GANDRA, 2019), no entanto as construções feitas em concreto armado ainda são predominantes, e o LSF ainda é pouco utilizado (CRASTO; FREITAS; SANTIAGO, 2012).…”

Section: Introductionunclassified

Sistema Construtivo Light Steel Framing: Avaliação Do Desempenho De Placas De Madeira Reconstituída

et al. 2021

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Levando em conta as ações transversais do sistema construtivo Light Steel Framing (LSF), o desempenho estrutural depende do comportamento ao cisalhamento das chapas de fechamento das paredes, em função dos módulos de elasticidade e de deformação transversal, entre outros fatores. Assim, o objetivo deste trabalho foi determinar o módulo de elasticidade nas direções longitudinal e transversal, das chapas de fechamento em compensado estrutural, por meio de ensaios à flexão estática em três pontos, nos quais foram seguidas as prescrições da NBR 9533 (ABNT, 2012), e compará-lo com resultados de pesquisas similares que usaram chapas Oriented Strand Board (OSB) no contraventamento do sistema LSF. Após análise dos resultados dos valores obtidos dos módulos de elasticidade em pesquisas que foram utilizadas chapas de OSB, e comparados com os resultados da presente pesquisa concluiu-se que é possível utilizar o compensado estrutural no sistema construtivo LSF destacando-se inclusive um desempenho superior.

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Prefabricated hybrid steel wall panels for mid-rise construction in seismic regions

Cited by 16 publications

References 32 publications

Operational Modal Analysis, Testing and Modelling of Prefabricated Steel Modules with Different LSF Composite Walls

Operational Modal Analysis, Testing and Modelling of Prefabricated Steel Modules with Different LSF Composite Walls

Robustness of multistory corner‐supported modular steel frames against progressive collapse

Sistema Construtivo Light Steel Framing: Avaliação Do Desempenho De Placas De Madeira Reconstituída

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