Chapter 9
Dynamic Responses of Reinforced
UHPCC Members Under Low-Velocity
Lateral Impact
9.1 Introduction
In modern infrastructures, reinforced concrete (RC) members, e.g., beams, columns
and piers, may undergo various kinds of lateral impact loading scenarios, e.g., vehicle
and ship collisions, rockfall rolling impact, etc. The local damage on members caused
by impact loading will spread in the entire structure and even leads to the whole
structural collapse (Institute 2006; Wardhana and Hadipriono 2003). For more precise
and adequate robustness design purposes, the lateral impact behaviors of structural
members should be studied in-depth.
The low velocity impact resistance of structural members is generally studied by
drop hammer impact tests and numerical simulations. Kishi et al. (2002) experimentally derived that, when the static shear-bending capacity ratio was less than 1.0, the
diagonal cracks would emerge on the NSC beam without stirrups under the drop
hammer impact loadings. Fujikake et al. (2009) carried out the drop hammer test on
NSC (42 MPa) beams with longitudinal reinforcement ratio ranging from 0.34 to
2.06%, and derived that NSC beams with lower amounts of longitudinal steel reinforcement exhibit overall flexural failure comparatively. Saatci and Vecchio (2009)
conducted a series of drop hammer tests on NSC beams with different shear reinforcement ratios. It was found that the severe diagonal shear cracks with a shear-plug
occurred under the impact point of the specimens, and the shear resistance of NSC
members played an important role in their overall performance. Based on the numerical simulations, Ozbolt and Sharma (2011) reported that the loading rate was a
significant factor in the cracking pattern of RC beams, and the influence of shear
reinforcement was reduced as the load rate increasing continuously. Wang et al.
(2011) preformed the lateral rapid loading tests on NSC columns (25 MPa), and it
was stated that the shear failure usually occurred with the low stirrup ratio, and the
ultimate bearing capacity of NSC columns can be enhanced with increasing the load
rate or longitudinal reinforcement ratio. Zhao et al. (2017, 2018) experimentally
and numerically examined the dynamic responses of NSC beams under different
© Science Press 2021
Q. Fang et al., UHPCC Under Impact and Blast,
https://doi.org/10.1007/978-981-33-6842-2_9
271
Dynamic Responses of Reinforced
UHPCC Members Under Low-Velocity
Lateral Impact
9.1 Introduction
In modern infrastructures, reinforced concrete (RC) members, e.g., beams, columns
and piers, may undergo various kinds of lateral impact loading scenarios, e.g., vehicle
and ship collisions, rockfall rolling impact, etc. The local damage on members caused
by impact loading will spread in the entire structure and even leads to the whole
structural collapse (Institute 2006; Wardhana and Hadipriono 2003). For more precise
and adequate robustness design purposes, the lateral impact behaviors of structural
members should be studied in-depth.
The low velocity impact resistance of structural members is generally studied by
drop hammer impact tests and numerical simulations. Kishi et al. (2002) experimentally derived that, when the static shear-bending capacity ratio was less than 1.0, the
diagonal cracks would emerge on the NSC beam without stirrups under the drop
hammer impact loadings. Fujikake et al. (2009) carried out the drop hammer test on
NSC (42 MPa) beams with longitudinal reinforcement ratio ranging from 0.34 to
2.06%, and derived that NSC beams with lower amounts of longitudinal steel reinforcement exhibit overall flexural failure comparatively. Saatci and Vecchio (2009)
conducted a series of drop hammer tests on NSC beams with different shear reinforcement ratios. It was found that the severe diagonal shear cracks with a shear-plug
occurred under the impact point of the specimens, and the shear resistance of NSC
members played an important role in their overall performance. Based on the numerical simulations, Ozbolt and Sharma (2011) reported that the loading rate was a
significant factor in the cracking pattern of RC beams, and the influence of shear
reinforcement was reduced as the load rate increasing continuously. Wang et al.
(2011) preformed the lateral rapid loading tests on NSC columns (25 MPa), and it
was stated that the shear failure usually occurred with the low stirrup ratio, and the
ultimate bearing capacity of NSC columns can be enhanced with increasing the load
rate or longitudinal reinforcement ratio. Zhao et al. (2017, 2018) experimentally
and numerically examined the dynamic responses of NSC beams under different
© Science Press 2021
Q. Fang et al., UHPCC Under Impact and Blast,
https://doi.org/10.1007/978-981-33-6842-2_9
271