摘要
对高温后混凝土Ⅰ型断裂性能进行了试验研究。试件几何形式统一采用《水工混凝土断裂试验规程》推荐值,历经65、120、200、300、350、400、450、500和600℃高温。采用楔入劈拉法测得高温后试件荷载—裂缝张开口位移(P-CMOD)全曲线,并据此计算相应温度下混凝土试件的起裂韧度KIQC、失稳韧度KSIC,得到随着受火温度的上升,KIQC单调下降,而KISC变化趋势为"保持不变-上升-下降"。
The investigations on the residual Mode- I fracture behaviors of concrete subject to elevated temperatures were carried out. The test specimens were molded according to ＂Norm for fracture test of hydraulic concrete＂ （ DL/T 5332-2005 ） and were exposure to temperatures varying from 65℃ to 600℃, The wedge splitting method was employed to obtain the Load-CMOD （crack mouth opening displacement） curves of post-fire specimens from which the initial fracture toughness K IC Q and the critical fracture tough＇ hess K IC S were calculated. It was demonstrated that the K IC Q decreased monotonously with increasing temperature ; however the K IC S sustained a hole-increase-decrease tendency with temperatures.
出处
《低温建筑技术》
2012年第1期1-3,共3页
Low Temperature Architecture Technology
关键词
高温
楔入劈拉法
断裂韧度
elevated temperatures
wedge splitting method
fracture toughness
