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A computational model for prestressed concrete hollow-core slab under natural firePečenko, Robert ...Performance-based approach, introducing a new two-phase computational model for determining the response of prestressed hollow-core concrete slab exposed to natural fire including heating and cooling ... phase, is presented. Firstly, the two-dimensional coupled hygro-thermo-chemical model is used to determine time dependent temperature and moisture field in the characteristic cross-section of the concrete hollow-core slab during fire. In addition, the influence of opening on the temperature distribution over prestressed hollow-core concrete slab is accounted for. Secondly, stress%strain state of prestressed concrete hollow-core slab is determined with a newly developed one-dimensional geometrical and material non-linear model, which includes a slip between concrete and tendon. Temperature dependent mechanical properties of concrete, tendon and bond stiffness are accounted for in the model. Model validation showed that the presented two-phase computational model is suitable for the analysis of prestressed hollow-core concrete slab exposed to natural fire. Furthermore, parametric studies revealed that heat exchange between the concrete section and the opening has a significant influence on the development of temperatures in the slab, particularly in the cooling phase, and consequently also on the development of slab displacements. In addition, it was identified that accounting for the slip between concrete and tendon enables the determination of the bond stress distribution and evaluation of the load bearing capacity of the contact.Source: International journal of concrete structures and materials =. - ISSN 1976-0485 (Vol. 13, no. 60, 2019, str. 1-17)Type of material - article, component part ; adult, seriousPublish date - 2019Language - englishCOBISS.SI-ID - 9046369
Author
Pečenko, Robert |
Hozjan, Tomaž |
Planinc, Igor |
Bratina, Sebastjan
Topics
prednapeta votla plošča |
naravni požar |
zdrs armature |
hygro-termo-kemijska analiza |
mehanska analiza |
MKE |
prestressed hollow-core concrete slab |
natural fire, bond stress-slip |
hygro-thermo-chemical analysis |
mechanical analysis |
FEM
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source: International journal of concrete structures and materials =. - ISSN 1976-0485 (Vol. 13, no. 60, 2019, str. 1-17)
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Pečenko, Robert | 34368 |
Hozjan, Tomaž | 25423 |
Planinc, Igor | 14507 |
Bratina, Sebastjan | 20158 |
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