Fracture toughness analysis of nano steel fibre reinforced concrete based on improved locust algorithm

作     者：Chen, Yanmin Zheng, Lina Miao, Pu 

作者机构：Shangqiu Inst Technol Sch Civil Engn Shangqiu 476000 Peoples R China 

出 版 物：《INTERNATIONAL JOURNAL OF MATERIALS & PRODUCT TECHNOLOGY》 (国际材料与产品技术杂志)

年 卷 期：2023年第67卷第1期

页      面：66-81页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：improved locust algorithm machine learning fracture toughness softening curve CART algorithm 

摘      要：A fracture toughness analysis method of nano steel fibre reinforced concrete based on improved locust algorithm was proposed in this paper. Firstly, P-CMOD curve is introduced to analyse the fracture mechanism of nano steel fibre reinforced concrete. Then, the minimum CART tree is trained by CART algorithm, and the objective function of fracture toughness is obtained by iterative training. Finally, the improved locust algorithm is introduced to calculate the fracture energy coefficient of nano steel fibre reinforced concrete, and the softening curve is modified by this algorithm to achieve the fracture toughness analysis of nano steel fibre reinforced concrete. The experimental results show that the concrete fracture toughness of this method is 0.56 Mpa center dot m(-1/2), and the critical crack opening displacement is 0.240 mm. The analytical values are consistent with the actual values. This method improves the analysis effect of fracture toughness and critical crack opening displacement of nano steel fibre reinforced concrete.