Square concrete columns strengthened withcarbon fiber reinforced plastics sheets at low temperatures
来源期刊:中南大学学报(英文版)2009年第5期
论文作者:马芹永 卢小雨
文章页码:835 - 840
Key words:carbon fiber reinforced plastics (CFRP) sheet; square concrete column; stress—strain model
Abstract: Twenty-one square concrete columns were constructed and tested. The testing results indicate that bonded carbon fiber reinforced plastics (CFRP) sheets can be used to increase the strength and improve the serviceability of damaged concrete columns at low temperatures. The failure of the specimens, in most cases, takes place within the middle half of the columns. And the failure of strengthened columns is sudden and explosive. The CFRP sheets increase both the axial load capacity and the ultimate concrete compressive strain of the columns. The ultimate loads of strengthened columns at -10, 0 and 10 ℃ increase averagely by 9.09%, 6.63% and 17.83%, respectively, as compared with those of the control specimens. The axial compressive strength of strengthened columns is related to the curing temperatures. The improvement of axial compressive strength decreases with reducing temperature, and when the temperature drops to a certain value, the improvement increases with falling temperature.
基金信息:the Outstanding Youth Foundation for Scientific and Technological Research of Anhui Province, China