Finite element study on bond behavior of steel bar and HSCC/HSFRCC
To study the bond behavior of steel bar and High Strength Cementitious Composites (HSCC) or High Strength Fiber Reinforced Cementitious Composites (HSFRCC), finite element simulations of Direct Tension Pull-out Bond Test (DTP-BT) are conducted. Default tensile strain softening relation in FE program ATENA is used to model HSCC. Satisfactory agreement between simulated and experimental load-displacement curve can be obtained by taking specific fracture energy of HSCC to be 50 N/m. Similar to experimental observations, tensile splitting failure is shown to be the dominate failure mode. To simulate the behavior of HSFRCC members, either the homogenization based approach (H-model) or individual crack based approach (I-model) can be employed to describe the tensile strain hardening behavior. In this paper, both approaches are first presented and discussed. Numerical results are compared to experimental results obtained in our laboratory. According to our findings, the pre-peak behavior of DTP-BT can be properly simulated by the I-model. On the other hand, H-model shows overestimation of pre-peak stiffness. Similar to HSCC, tensile splitting failure is the dominate failure mode of HSFRCC DTP-BT member. From the tests, the width of the splitting crack is wider at the surface than at the steel level. This can be explained by the numerical simulation which shows very high tensile stress at the surface of the DTP-BT specimen.
The 7th International Conference on Fracture Mechanics of Concrete and Concrete Structures
Cheung, K.,Leung, C.,& Kabele, P. (2010). Finite element study on bond behavior of steel bar and HSCC/HSFRCC. The 7th International Conference on Fracture Mechanics of Concrete and Concrete Structures. Retrieved from http://repository.vtc.edu.hk/thei-fac-sci-tech-sp/245