266
8 Response of UHPCC-FST Subjected to Low-Velocity Impact
Fig. 8.26 Comparisons of numerical and experimental mid-span deflection-time histories a U-N
b U-S-0.53% c U-S-1.05% d U-S-1.71%, reprinted from Wu et al. (2019), copyright 2020, with
permission from Elsevier
8.6 Summary
In this chapter, the impact behavior of UHPCC-FSTs under transverse impact load is
investigated experimentally and numerically. A set of three UHPCC-FSTs are fabricated and tested subjected to low-velocity impact by using a drop-hammer impact
device. The model parameters of K&C model for UHPCC are calibrated by using the
existing static and dynamic experimental data. Then a FE analysis model is established to predict the dynamic responses of UHPCC-FSTs under transverse impact
load. The main work and conclusions are drawn:
(1) The axial compression test on UHPCC-FST is conducted, the axial loadaxial displacement and -lateral displacement curves are obtained, and the
constraining factor of the present UHPCC-FST is confirmed.
(2) UHPCC-FSTs deform in a ductile manner and there is no severe local buckling in the steel tube. UHPCC core restricts effectively the indentation within
8 Response of UHPCC-FST Subjected to Low-Velocity Impact
Fig. 8.26 Comparisons of numerical and experimental mid-span deflection-time histories a U-N
b U-S-0.53% c U-S-1.05% d U-S-1.71%, reprinted from Wu et al. (2019), copyright 2020, with
permission from Elsevier
8.6 Summary
In this chapter, the impact behavior of UHPCC-FSTs under transverse impact load is
investigated experimentally and numerically. A set of three UHPCC-FSTs are fabricated and tested subjected to low-velocity impact by using a drop-hammer impact
device. The model parameters of K&C model for UHPCC are calibrated by using the
existing static and dynamic experimental data. Then a FE analysis model is established to predict the dynamic responses of UHPCC-FSTs under transverse impact
load. The main work and conclusions are drawn:
(1) The axial compression test on UHPCC-FST is conducted, the axial loadaxial displacement and -lateral displacement curves are obtained, and the
constraining factor of the present UHPCC-FST is confirmed.
(2) UHPCC-FSTs deform in a ductile manner and there is no severe local buckling in the steel tube. UHPCC core restricts effectively the indentation within