کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
285372 509192 2011 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Post-fire bond between the steel tube and concrete in concrete-filled steel tubular columns
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
Post-fire bond between the steel tube and concrete in concrete-filled steel tubular columns
چکیده انگلیسی

Push-out tests were carried out on 64 concrete-filled steel tubular columns, which had been exposed to ISO 834 standard fire for 90 min or 180 min, respectively. At the same time, 12 unheated specimens were also prepared and tested for comparison. The variables investigated in the bond tests were selected as (a) fire exposure time; (b) cross-section type; (c) cross-sectional dimension; (d) interface length to diameter (or width) ratio; (e) concrete type; (f) fly ash type; and (g) concrete curing condition. The effects of the above different parameters on the bond behaviour are discussed. The test results indicate that fire exposure had a significant effect on the bond between a steel tube and its concrete core. A decrease in bond strength was generally observed for specimens after a fire exposure of 90 min; however, bond strength recovery was found when the fire exposure time was extended to 180 min. Other factors also had influence to some extent.

Research highlights
► Long time fire exposure may lead to bond strength recovery.
► Circular columns have much higher bond strength than square columns.
► Bond strength decreases with increasing cross-sectional dimension.
► Bond strength of self-consolidating concrete is comparable to that of normal concrete.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Constructional Steel Research - Volume 67, Issue 3, March 2011, Pages 484–496
نویسندگان
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