Investigation of constitutive models of HPFRCC subjected to static and dynamic loadings

High-performance fiber-reinforced cement composite (HPFRCC), an advanced construction material, has superior material properties than normal concrete. As concrete constitutive models, such as the Karagozian & Case (K&C) and continuous surface cap (CSC) models, are utilized in various numerical analyses of HPFRCC structures under static and dynamic loadings, here, calibration methods for these two constitutive models are suggested to describe the material behaviors of HPFRCC more precisely based on uniaxial and triaxial test data. Multi-element analysis of laboratory material tests is performed on the calibrated models with four different element sizes not only to examine their reliability but also to investigate their mesh-size dependency. Moreover, the differences in the performance of these models are analyzed in terms of their theoretical background, and numerical simulations are performed on the HPFRCC structures subjected to a low-velocity impact as well as near-field blast tests. By comparing the numerical and experimental results, the CSC model is found to exhibit strength for simulating crack distribution at low strain rates, whereas the K&C model shows reasonable predictions of the failure behavior of HPFRCC structures at high strain rates.