摘要
通过钢纤维混凝土 4点弯曲试验 ,对经典的刚度衰减法等一系列描述损伤的模型进行了分析比较 ,同时对依赖于应变的分段损伤模型进行了分析 ,认为修正后的刚度衰减模型更能够反映混凝土及纤维混凝土弯曲损伤的发展规律。此外 ,对于以损伤耗散能量法建立的岩石损伤模型 ,利用弯曲试验结果进行分析 ,同样可以用来描述混凝土弯曲损伤演化规律。
Concrete beams with different fiber volume fractions,0%,0 5%,0 75%,1 2% were tested by four point flexure experiment.Some kind of damage models are discussed.It is pointed out that the traditional model which describes test curve of damage with stiffness declination is analyzed,besides,the damage model based on strain is also analyzed.The conclusion can be drawn by comparison that the modified stiffness models considering plastic strain,are more suitable for describing the damage accumulation during flexure.Moreover,a new damage definition is proposed herein relying on energy dissipation,which is also investigated according to the test results.This model offers a new approach to analysis the flexure damage accumulation.
出处
《工业建筑》
CSCD
北大核心
2002年第11期1-4,27,共5页
Industrial Construction
关键词
钢纤维混凝土
弯曲
损伤
concrete\ steel fiber reinforced concrete\ flexure\ damage
