Mechanics and Design for Bond Splitting Failure in Reinforced Concrete

本研究的目的是建立一个合理、可靠的公式来评价混凝土中钢筋的粘结劈裂强度。1996年，用以下参数进行了搭接拼接试验：(A)横向配筋率(0.3%和1.2%)；(B)是否有子筋；(C)主筋与横向钢筋之间的间隙；(D)搭接长度(主筋直径的10倍或40倍)。第三个参数对于验证我们基于三角形梁假设的模型的正确性尤为重要。结果与我们的预测不符。因此，1997年对该模型进行了修订。在新模型中，采用Voronoi图对拼接梁截面进行划分，并采用刚体弹簧模型进行分析。将结果沿拼接进行积分。双方达成了更好的共识。

The objective of this study is to develop a rational and reliable equation to evaluate bond splitting strength of reinforcing bars in concrete. In 1996, a series of experiments of lap splices were conducted with the following parameters :(a) ratio of transverse reinforcement (0.3% and 1,2%) ;(b) with or without sub-ties(c) clearance between main bars and transverse reinforcement(d) splice length (10times or 40 times of main bar diameter)The third parameter was especially important to verify whether our model based on the assumption of triangular beams was correct or not. The results were against our prediction. Thus, in 1997, the model was revised. In the new model, beam section with splice was partitioned using Voronoi diagram, and anlyzed using the rigid-body-spring-model. The results were integrated along the splice. Much better agreement was obtained.