Correlation of tensile and flexural behaviors of high toughness cementitious composites
Li Anling1,2 Guo Shuaicheng1,2 Zhu Deju1,2
1. College of Civil Engineering, Hunan University, Changsha 410082，China;2. Key Laboratory for Green & Advanced Civil Engineering
Materials and Application Technology of Hunan Province, Hunan University, Changsha 410082，China
Abstract：The mechanical performance of high toughness cementitious composite (HTCC) can be indicated by its tensile stress-strain response. Furthermore, the simplified linear models cannot accurately analyze the mechanical performance of the HTCC materials. To analyze the mechanical performance of the HTCC materials with high accuracy, a four-stage linear constitutive model was proposed to represent the strain hardening and softening behaviors of the HTCC materials. Based on the proposed constitutive model, the theoretical solution for the moment-curvature response of the components with rectangular crosssection was derived. The mid-span deflections of the components in the three-point and four-point bending tests were calculated by using the method of bending moment area, and the correlation between the tensile and flexural performances of the HTCC materials was obtained. The analytical model was used to simulate the flexural behavior of HTCC material, and the accuracy of the model was verified through the comparison with the experimental data in the literature. The influence of the tensile constitutive parameters on the flexural behavior of the HTCC materials was then analyzed through the parameter analysis. Based on the analysis results, it is disclosed that the analytical model can accurately evaluate the parameters of the tensile constitutive model or the flexural mechanical behaviors of the HTCC materials, and provide technical support for the flexural performance design of the rectangular components made of HTCC materials.
