Effect of Fire Damage on Seismic Behavior of Cast-in-Place Reinforced Concrete Columns

Demir, Uğur; Göksu, Çağlar; Unal, Goktug; Green, Mark F.; İlki, Alper

doi:10.1061/(asce)st.1943-541x.0002794

Cited by 13 publications

(11 citation statements)

References 21 publications

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“…Concrete02 is used to express the nonlinear behaviour of both the unconfined concrete in the cover as well as the confined concrete in the core. In line with existing literature (e.g., 1 , 9 ), the values of the aforementioned key variables for both steel and concrete are estimated either by experimental data, or where this is not possible, through existing stress–strain models (details in " Post-fire residual materials properties " section). With regard to the confined concrete, key properties are estimated using existing confined concrete stress–strain models for monotonic loading.…”

Section: Framework For Modelling Post-fire Cyclic Behaviour Of Rc Columnmentioning

confidence: 99%

“…A future earthquake is therefore likely to affect RC buildings that have had previous fire exposure. Recent experimental as well as analytical studies showed the negative impact of prior fire exposure to the seismic behaviour mainly of columns 1 – 7 but also of structural walls 8 as well as a non-seismically designed frame 9 . It should be mentioned that pre-cast 4 as well as cast-in-place columns (with ordinary 1 – 3 , 6 as well as sustainable concrete 5 ) have been considered.…”

Section: Introductionmentioning

confidence: 99%

“…Recent experimental as well as analytical studies showed the negative impact of prior fire exposure to the seismic behaviour mainly of columns 1 – 7 but also of structural walls 8 as well as a non-seismically designed frame 9 . It should be mentioned that pre-cast 4 as well as cast-in-place columns (with ordinary 1 – 3 , 6 as well as sustainable concrete 5 ) have been considered. Two studies also examined 2 , 7 the post-fire cyclic behaviour of columns strengthened with fibre reinforced polymer (FRP).…”

Section: Introductionmentioning

confidence: 99%

“…Key to the analysis of the performance RC structures subjected to a fire and earthquake hazard sequence, is the use of reliable material models which can describe the cumulative effects of the hazards on the concrete (unconfined and confined) and reinforcing steel. The relevant literature is very limited; the most relevant studies focusing on the post-fire seismic behaviour of an ordinary seismically-designed column 1 or structural wall 8 . There are established equations for accounting for the residual degradation of unconfined concrete strength and steel yield strength under fire.…”

Section: Introductionmentioning

confidence: 99%

“…A review of existing literature shows that relevant existing studies have adopted only one confinement model (i.e. Mander et al used by 3 and Chang and Mander adopted by 1 , 8 ), and that there is no assessment of the influence of confinement model choice on the resulting predicted behaviour of RC elements exposed to post-fire cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

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Simplified model for pre-code RC column exposed to fire followed by earthquake

Ιωάννου¹,

Rossetto²,

Rush

et al. 2022

Sci Rep

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The behaviour of pre-code reinforced concrete (RC) columns in sequence of fire and earthquake is not well understood and can be critical in case of buildings which experienced fire and are either unrepaired or poorly repaired when exposed to an earthquake. This study proposes a framework on how to construct a simplified model to assess the post-fire cyclic behaviour of such columns. Emphasis is given to the development of simplified material models which can be used to describe the performance of the confined concrete, as its post-fire behaviour is not well studied. The model’s performance is validated against the experimental results of a square, non-seismically designed RC column. Three scenarios are considered. The reference scenario, where the column is exposed only to cyclic loading. In the other two, the column is firstly exposed to an ISO-834 time–temperature curves in a furnace of 30 min and 90 min duration and after it cooled down, it is exposed to cyclic loading. The results showed that simplified material models can be used to capture the post-fire cyclic behaviour of an RC column, built without seismic design. It was also found that the confined model adopted played an important role after the peak strength is reached.

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Section: Framework For Modelling Post-fire Cyclic Behaviour Of Rc Columnmentioning

confidence: 99%