长江科学院院报2013，Vol.30Issue(3)：66-70,5.DOI:10.3969/j.issn.1001-5485.2013.03.014
钢筋混凝土三点弯曲梁断裂韧度计算模型
A Model for Predicting the Fracture Toughness of Reinforced Concrete Beam in Three-Point Bending
摘要
Abstract
On the basis of fictitious crack model, an analytical method to calculate the fracture toughness of reinforced concrete was proposed under reasonable hypothesis by analyzing the mechanical characteristics at the cracked section of a specimen in three-point bending. The method was used to calculate the maximum load, critical effective crack length and in turn the fracture toughness of reinforced concrete beams in three-point bending whose α0 (ratio of initial crack length to specimen height) were 0. 2, 0.3, 0.4 and 0. 5 respectively. The maximum error of unstable fracture toughness was 4.951% by comparing calculation results with test data. The results indicated that the method could predict the unstable fracture toughness precisely. Furthermore, the impact of α0 on the unstable fracture toughness was studied. It was found that the unstable fracture toughness generally did not vary with α0, thus could be regarded as material constant to determine whether a crack will propagate.关键词
钢筋混凝土/失稳断裂韧度/初始缝高比/最大荷载Key words
reinforced concrete/ unstable fracture toughness/ initial crack height ratio/ maximum load分类
建筑与水利引用本文复制引用
胡少伟,米正祥,范向前,陆俊..钢筋混凝土三点弯曲梁断裂韧度计算模型[J].长江科学院院报,2013,30(3):66-70,5.基金项目
水利部公益行业专项(201201038) （201201038）
水利部前期项目(S409001) （S409001）
