混凝土断裂参数计算方法研究  

Study on the calculation approach for fracture parameters of concrete

作　　者：裴向辉[1] 吴金旭 PEI Xiang-hui;WU Jin-xu(China Water Resources Beifang Investigation,Design and Research Co.,Ltd.,Tianjin 300222,China)

机构地区：[1]中水北方勘测设计研究有限责任公司,天津300222

出　　处：《四川建材》2023年第1期12-15,18,共5页Sichuan Building Materials

摘　　要：提出利用五阶权函数计算粘聚力断裂韧度K_(I)^(C)的计算公式,并考虑到位移加载时裂缝扩展过程中的峰值荷载对应于外荷载的极大值这一特性,进而建立了只需代入峰值荷载P_(max)后便可求得混凝土双K断裂参数的解析计算模型。然后,利用本模型计算与文献中报道的试验值进行比较,结果表明,利用本模型计算的理论值与试验值吻合良好,最大误差不超过8%。A formula for determining cohesive fracture toughness was proposed in this paper based on fifth-order weight function method. At the same time, an analytical model for calculating the double-K fracture parameters was developed using input conditions of the peak load. In this approach, peak load state corresponding to a maximum value of the external load in the displacement loading was considered. And then, the values by using the proposed method and the calculated results were compared with experiment date reported in the reference. The comparison showed that the values calculated agree well with experiment date and the maximum error between then is no more than 8%.

关 键 词：混凝土 粘聚力断裂韧度 起裂断裂韧度 权函数法 三点弯曲试件 

分 类 号：TU528.31[建筑科学—建筑技术科学]