Closure to “Fire Resistance of Gypsum Board Protected Steel Columns with High Load Ratios” by Zheng Peng and Hossein Mostafaei
This article is a reply.
VIEW THE ORIGINAL ARTICLEPublication: Journal of Structural Engineering
Volume 145, Issue 12
We thank Professor Gamble for his discussion. Professor Gamble did not raise any questions about the methodology and formulas developed in our paper. His comments mainly focused on the comparisons we did with solutions per ECCS (1985). We provide clarification to each of the items discussed by Professor Gamble:
1.
Are the ECCS curves in Figs. 14 and 15 for heavy insulation?
Yes. To generate the ECCS curves in Figs. 14 and 15, we used Eq. (5) in the original paper [which is also from ECCS (1985)] and Table D3 in the appendix of ECCS (1985). Table D3 is for lightweight insulation. However, the table values are based on the parameter. We modified using Eq. (1) based on ECCS (1985). The same modification was used in Eq. (5) to capture heavy insulation by ECCS (1985),
(1)
For clarification, we plot the results without and with the modification (for light and heavy insulation) in Fig. 1, which replicates Fig. 14 of the original paper. The curve for heavy insulation, “Table Solution (Heavy),” is the one we presented in Fig. 14 of the original paper as “ECCS.” We performed the same comparison for the case shown in Fig. 15 of the original paper and achieved the same verification. Therefore, the ECCS curves in Figs. 14 and 15 are for heavy insulations.
Based on our communication with Professor Gamble, the results referenced in his discussion were obtained using a modified formula from his lecture note, which was not available when the paper was written. We did, however, compare the results here with the modified formula (Fig. 2). The modified formula did provide results somewhere between the test results and the Gamble (1989) formula. The “Gamble Lecture Note 2” curve is lower than the “Gamble Lecture Note 1” curve in Fig. 2 because we used the thermal properties obtained from the test results for “Gamble Lecture Note 1.” Professor Gamble, on the other hand, used generic values (e.g., lower thermal conductivity values) for the case labeled “Gamble Lecture Note 2.”
References
ECCS (European Convention for Constructional Steelwork). 1985. Design manual on the European recommendation for the fire safety of steel structures. Brussels, Belgium: ECCS.
Gamble, W. L. 1989. “Predicting protected steel member fire endurance using spread-sheet programs.” Fire Technol. 25 (3): 256–273. https://doi.org/10.1007/BF01039782.
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©2019 American Society of Civil Engineers.
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Received: Feb 27, 2019
Accepted: Apr 17, 2019
Published online: Oct 10, 2019
Published in print: Dec 1, 2019
Discussion open until: Mar 10, 2020
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