264
8 Response of UHPCC-FST Subjected to Low-Velocity Impact
Fig. 8.23 Comparisons of experimental and predicted deflection-time histories a C-5 b C-8 c C-11,
reprinted from Wu et al. (2019), copyright 2020, with permission from Elsevier
8.5.2 Yoo et al. (2015) Test
In this section, by using the finite element program Hypermesh/LS-DYNA, the
drop-hammer impact test on the ultra-high performance fiber reinforced concrete
(UHPFRC) beams are numerically simulated to further validate the proposed K&C
model parameters.
Yoo et al. (2015) conducted a series of drop-hammer impact tests on the ultra-high
performance fiber reinforced concrete (UHPFRC) beams, as shown in Fig. 8.24. The
total mass and release heights of the drop hammer are 270 kg and 1.6 m, respectively.
A total of four large-sized (200 × 270 × 2900 mm) beams were fabricated and the
detailed geometry and arrangement of reinforcements (diameter of 12.7 mm) are
shown in Fig. 8.25. “UH-N” represents a beam series without steel rebar and “UH-Sρ r ” represents a beam series reinforced with steel rebar, where the letters ρ r indicates
the reinforcement ratio. The compressive strength and elastic modulus of UHPFRC
are 152.5 MPa and 44GPa, respectively. The yield strength, ultimate strength and
elastic modulus of rebar are 522.7 MPa, 627.6 MPa and 200GPa, respectively.
Figure 8.26 shows the corresponding numerical and experimental mid-span
deflection-time histories of UHPFRC beams. As can be seen, the deflection-time
8 Response of UHPCC-FST Subjected to Low-Velocity Impact
Fig. 8.23 Comparisons of experimental and predicted deflection-time histories a C-5 b C-8 c C-11,
reprinted from Wu et al. (2019), copyright 2020, with permission from Elsevier
8.5.2 Yoo et al. (2015) Test
In this section, by using the finite element program Hypermesh/LS-DYNA, the
drop-hammer impact test on the ultra-high performance fiber reinforced concrete
(UHPFRC) beams are numerically simulated to further validate the proposed K&C
model parameters.
Yoo et al. (2015) conducted a series of drop-hammer impact tests on the ultra-high
performance fiber reinforced concrete (UHPFRC) beams, as shown in Fig. 8.24. The
total mass and release heights of the drop hammer are 270 kg and 1.6 m, respectively.
A total of four large-sized (200 × 270 × 2900 mm) beams were fabricated and the
detailed geometry and arrangement of reinforcements (diameter of 12.7 mm) are
shown in Fig. 8.25. “UH-N” represents a beam series without steel rebar and “UH-Sρ r ” represents a beam series reinforced with steel rebar, where the letters ρ r indicates
the reinforcement ratio. The compressive strength and elastic modulus of UHPFRC
are 152.5 MPa and 44GPa, respectively. The yield strength, ultimate strength and
elastic modulus of rebar are 522.7 MPa, 627.6 MPa and 200GPa, respectively.
Figure 8.26 shows the corresponding numerical and experimental mid-span
deflection-time histories of UHPFRC beams. As can be seen, the deflection-time