试件形式对混凝土失稳韧度的影响

Influence of the Shape of Specimen on the Concrete K_(IC)^(un)

为了确定用三点弯曲梁和楔入劈拉两种形式试件所测的混凝土失稳韧度是否相同以及有多大差异,从两种形式试件的比值入手,对二者失稳韧度的关系进行了分析。结果表明,当试件的混凝土材料相同、高度也相同时,用三点弯曲梁和楔入劈拉试件测得的混凝土失稳韧度差异甚小。

At present, two kinds of geometry shape specimens, three-point bending beam and wedge splitting specimen are often used to test the unstable fracture toughness KIC^un of concrete. To ascertain the difference of fracture toughness tested by the two kinds of specimens, the relation of the unstable fracture toughness was analyzed from the angle of ratio of two shape specimens KIC^un . The conclusion is： there is little difference of the unstable fracture toughness KIC^un tested by three-point bending beam and wedge splitting specimen, when the concrete material and height of the specimens are same.