000 02399nam a22001937i 4500
008 211024s2018 ua ||||f m||| 00| 0 eng d
040 _aEG-NcFUE
_erda
245 1 0 _aEffect of Extinguishing Method on the Behavior of RC Columns Subjected to Fire /
_cby Youssef Ahmed El-Sayed Kamal Awad ; Supervised By Dr. Yehia Abdel Zaher Ali Dr. Mohamed Abdel Moaty Khalaf Dr. Mohamed Kohail Fayez
264 1 _c2018
300 _all, xll,120 pages ;
_c29 cm
336 _atext
_2rdacontent
337 _aunmediated
_2rdamedia
338 _avolume
_2rdacarrier
500 _aSupervised By Dr. Yehia Abdel Zaher Ali Dr. Mohamed Abdel Moaty Khalaf Dr. Mohamed Kohail Fayez.
502 _aThesis (M.Sc.) - Ain Shams University - Faculty of Engineering Department of Structural Engineering, 2018.
520 _aConcrete is more durable against fire than other structural materials. However, high temperature has deteriorating effects on mechanical properties of concrete. Decreases of strength at higher temperatures can be associated with various reasons, such as micro-and macro-cracks on the concrete, the volume expansion in the aggregate, and the deterioration of the calcium silicate hydrate (C-S-H) gels in the cement paste. The main objective of this research work is to study the effect of four different cooling schemes on the ultimate strength of 54 reinforced concrete columns subjected to fire. The tested columns are of different surface area to volume ratios (with three different cross sections; circular, square and rectangular). Four cooling schemes were used; three of them are uniform cooling schemes with different rates (rapid, slow and intermediate) while the fourth cooling scheme was non-uniform. Two different fire temperatures and durations were considered (300oC for 3 Hours & 600oC for 6 Hours). Non Destructive tests (Core & Ultrasonic Pulse Velocity tests) were used to estimate the deterioration extent of fire on concrete properties. A mathematical model was developed to estimate the ultimate strength of RC columns subjected to fire in order to decide if the R.C. columns need repair and strengthening after fire or not. Results of the model and the obtained experimental results were compared together to evaluate the accuracy of the proposed model.
856 4 0 _3DSpace electronic resources
_uhttp://repository.fue.edu.eg/xmlui/handle/123456789/326
942 _cTHESIS
999 _c12979
_d12979