Search Results - "Helder, D."

Numerical investigation of the cyclic performance of reinforced concrete frames equipped with a combination of a rubber core and a U-shaped metallic damper by Rahnavard, Rohola, Rebelo, Carlos, Craveiro, Hélder D., Napolitano, Rebecca

“…•FE analysis of RC frame equipped with hybrid dampers were carried out.•Three experimental specimen including concrete frame, steel damper, and rubber were…”
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Understanding the cyclic performance of composite steel-concrete connections on steel bridges by Rahnavard, Rohola, Rebelo, Carlos, Craveiro, Hélder D., Napolitano, Rebecca

“…•17 FE models of steel bridges with welded and composite connections were created.•Static cyclic and dynamic time history analysis were applied.•The results…”
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Buckling resistance of concrete-filled cold-formed steel (CF-CFS) built-up short columns under compression by Rahnavard, Rohola, Craveiro, Hélder D., Simões, Rui A., Laím, Luís, Santiago, Aldina

“…The steel–concrete composite columns (SCCC) are widely used in the construction sector. The buckling phenomenon of the steel part (especially thin-walled…”
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Physico-mechanical properties of chitosan films with carvacrol and grape seed extract by Rubilar, Javiera F., Cruz, Rui M.S., Silva, Hélder D., Vicente, António A., Khmelinskii, Igor, Vieira, Margarida C.

“…► Films based on chitosan with addition of carvacrol and grape seed extract (GSE) were studied. ► Film-1 was composed by 9.6ppm (carvacrol), 684ppm (GSE) and…”
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Buckling behavior of closed built-up cold-formed steel columns under compression by Craveiro, Hélder D., Rahnavard, Rohola, Laím, Luís, Simões, Rui A., Santiago, Aldina

“…The versatility of cold-formed steel sections ensures the possibility of combining multiple individual sections forming built-up members with significantly…”
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Evaluating the effect of chitosan layer on bioaccessibility and cellular uptake of curcumin nanoemulsions by Silva, Hélder D., Beldíková, Eliška, Poejo, Joana, Abrunhosa, Luís, Serra, Ana Teresa, Duarte, Catarina M.M., Brányik, Tomáš, Cerqueira, Miguel A., Pinheiro, Ana C., Vicente, António A.

“…Curcumin nanoemulsions stabilized by whey protein isolate were successfully developed using high-pressure homogenization. The effect of a chitosan layer…”
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Evaluation of the composite action of cold-formed steel built-up battened columns composed of two sigma-shaped sections by Rahnavard, Rohola, Razavi, Mahtabsadat, Fanaie, Nader, Craveiro, Hélder D.

“…Cold-formed steel (CFS) built-up battened columns are employed to obtain a sufficient load-bearing capacity when individual profiles cannot withstand the…”
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Structural Fire Performance of Concrete-Filled Built-Up Cold-Formed Steel Columns by Craveiro, Hélder D, Rahnavard, Rohola, Henriques, José, Simões, Rui A

“…Concrete-filled composite columns are widely used in the construction industry, exploiting the benefits of combining steel and concrete, providing, for…”
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Concrete-filled cold-formed steel (CF-CFS) built-up columns subjected to elevated temperatures: Test and design by Rahnavard, Rohola, Craveiro, Hélder D., Simões, Rui A., Santiago, Aldina

“…This paper evaluates the behaviour of an innovative type of lightweight concrete-filled cold-formed steel (CF-CFS) built-up composite long column in the fire…”
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Fracture behaviour of thin-walled cold-formed steel at elevated temperatures by Rahnavard, Rohola, Craveiro, Hélder D., Simões, Rui A., Gardner, Leroy

“…Cold-formed steel (CFS) is being increasingly used in structural applications due to its high strength-to-weight ratio, ease of construction and versatility…”
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Concrete-filled cold-formed steel (CF-CFS) built-up columns under compression: Test and design by Rahnavard, Rohola, Craveiro, Hélder D., Lopes, Marco, Simões, Rui A., Laím, Luís, Rebelo, Carlos

“…This paper aims to present the axial behavior of a new composite column through an experimental and computational investigation. Four distinct configurations…”
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Numerical investigation on the composite action of cold-formed steel built-up battened columns by Rahnavard, Rohola, Craveiro, Hélder D., Laím, Luís, Simões, Rui A., Napolitano, Rebecca

“…Cold-formed steel (CFS) built-up sections are widely used to achieve adequate load-bearing capacity when individual shapes are not able to resist the design…”
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Buckling resistance of axially loaded cold-formed steel columns by Craveiro, Hélder D., Rodrigues, João Paulo C., Laím, Luís

“…This paper reports an experimental campaign on the buckling behaviour of compressed single and built-up cold-formed steel columns. Four types of cross-sections…”
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Evacuation Simulation under Threat of Wildfire—An Overview of Research, Development, and Knowledge Gaps by Beyki, Shahab Mohammad, Santiago, Aldina, Laím, Luís, Craveiro, Hélder D.

“…Wildfires have become a common incident over the past decades, and they have been threatening people’s lives and assets. In the communities close to wildlands…”
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Review of the high temperature mechanical and thermal properties of the steels used in cold formed steel structures – The case of the S280 Gd+Z steel by Craveiro, Hélder D., Rodrigues, João Paulo C., Santiago, Aldina, Laím, Luís

“…The accuracy of structural fire design of cold-formed steel structures depends on the available predictive models regarding mechanical and thermal properties…”
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Fire resistance of concrete-filled cold-formed steel (CF-CFS) built-up short columns by Rahnavard, Rohola, Craveiro, Hélder D., Simões, Rui A., Laím, Luís, Santiago, Aldina

“…The concrete-filled cold-formed steel built-up composite (CF-CFS) column is an innovative and versatile solution that may be used as an alternative structural…”
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Test and design of built-up cold-formed steel-lightweight concrete (CFS-LWC) composite beams by Rahnavard, Rohola, Craveiro, Hélder D., Simões, Rui A., Laím, Luís, Santiago, Aldina

“…•Tests conducted on the built-up cold-formed steel-lightweight concrete composite beams.•Finite element modelling approach developed and validated against the…”
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Experimental and Numerical Evaluation of a Wildland–Urban Interface Fire Scenario by Craveiro, Hélder D., Fiorini, Cesare, Laím, Luís, Guillaume, Bruno, Santiago, Aldina

“…This paper presents the results obtained from a field fire test, aiming to reproduce a wildland–urban interface scenario to collect relevant information…”
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Equivalent temperature prediction for concrete-filled cold-formed steel (CF-CFS) built-up column sections (part B) by Rahnavard, Rohola, Craveiro, Hélder D., Simões, Rui A., Santiago, Aldina

“…Innovative concrete-filled cold-formed steel (CF-CFS) built-up column sections subjected to axial compression and elevated temperatures were previously…”
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Equivalent temperature prediction for concrete-filled cold-formed steel (CF-CFS) built-up column sections (part A) by Rahnavard, Rohola, Craveiro, Hélder D., Simões, Rui A., Santiago, Aldina

“…This study aims to present an empirical formulation to predict equivalent temperature for steel and concrete components of the innovative concrete-filled…”
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