vi
Preface
on UHPCC targets with the striking velocities at 510 to 1320 m/s as well as the
comparable projectile penetration test on UHP-CASFRC are presented. The influence
of coarse aggregates strength on the impact resistance of UHPCC targets is discussed
based on the 3D mesoscopic concrete model.
Chapter 6: Aiming to protect person and valuable equipment from the perforated
small caliber arms and scabbing fragments, the 7.62 mm API bullet impacting test
on bare and rear fabric (CFRP or UHMWPE) strengthened UHP-BASFRC panels
is given and the excellent impact resistance of bare and composite UHP-BASFRC
panels is validated.
Chapter 7: The medium caliber projectile impact resistance of armor
steel/ceramic/UHPCC-layered composite targets against 30CrMnSiNi2A steel
projectiles is experimentally studied. The numerical simulations are further
performed by calibrating the Johnson and Cook (JC) constitutive model parameters
of the 10CrNi3MoV21A, NP450 and NP500 armor steel.
Chapter 8: The impact behavior of UHPCC-FST under transverse impact load
is investigated experimentally and numerically. Three UHPCC-FST specimens
subjected to low-velocity impact by using a drop-hammer impact device are examined
experimentally. 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.
Chapter 9: A total of eleven steel bar reinforced UHPCC and two reinforced NSC
control specimens subjected to drop-hammer impact are studied. The outstanding
impact resistance of UHPC members is validated and assessed quantitatively. The
model parameters and the parameters generation method of continuous surface cap
(CSC) model for UHPCC are calibrated and fully validated.
Chapter 10: The test on five UHPCC-FST specimens under contact explosion of
TNT charges is given, and the original axial capacity of the intact columns and the
residual axial capacity of the blast-damaged columns are further evaluated though
the axial compression tests. Besides, the damage and failure modes of UHPCC-FST
are numerically reproduced, and the related parametric influences are discussed.
Chapter 11: The field test of four circular UHPCC-FST specimens under the
close-range TNT charge explosion with the scaled standoff distance of 0.12 ~ 0.14
m/kg
1/3 is presented. The dynamic responses of those specimens are analyzed by three
different methods, i.e., ALE method, velocity loading method and SDOF method, and
the velocity method is recommended by considering both the accuracy and efficiency
of computation.
Chapter 12: The residual seismic resistance (RSR) of UHPCC-FST specimens
after contact explosion is studied experimentally. The specimens are firstly subjected
to blast loadings, in which the TNT charge weights are 1 ~ 3 kg and the height of
bursts are set to 250 mm. Furthermore, the RSR of UHPCC-FST specimens are
examined through the low-frequency horizontal cyclic loading test in two perpendicular directions. A composite damage index is proposed to evaluate the RSR of
the post-blast columns.
Preface
on UHPCC targets with the striking velocities at 510 to 1320 m/s as well as the
comparable projectile penetration test on UHP-CASFRC are presented. The influence
of coarse aggregates strength on the impact resistance of UHPCC targets is discussed
based on the 3D mesoscopic concrete model.
Chapter 6: Aiming to protect person and valuable equipment from the perforated
small caliber arms and scabbing fragments, the 7.62 mm API bullet impacting test
on bare and rear fabric (CFRP or UHMWPE) strengthened UHP-BASFRC panels
is given and the excellent impact resistance of bare and composite UHP-BASFRC
panels is validated.
Chapter 7: The medium caliber projectile impact resistance of armor
steel/ceramic/UHPCC-layered composite targets against 30CrMnSiNi2A steel
projectiles is experimentally studied. The numerical simulations are further
performed by calibrating the Johnson and Cook (JC) constitutive model parameters
of the 10CrNi3MoV21A, NP450 and NP500 armor steel.
Chapter 8: The impact behavior of UHPCC-FST under transverse impact load
is investigated experimentally and numerically. Three UHPCC-FST specimens
subjected to low-velocity impact by using a drop-hammer impact device are examined
experimentally. 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.
Chapter 9: A total of eleven steel bar reinforced UHPCC and two reinforced NSC
control specimens subjected to drop-hammer impact are studied. The outstanding
impact resistance of UHPC members is validated and assessed quantitatively. The
model parameters and the parameters generation method of continuous surface cap
(CSC) model for UHPCC are calibrated and fully validated.
Chapter 10: The test on five UHPCC-FST specimens under contact explosion of
TNT charges is given, and the original axial capacity of the intact columns and the
residual axial capacity of the blast-damaged columns are further evaluated though
the axial compression tests. Besides, the damage and failure modes of UHPCC-FST
are numerically reproduced, and the related parametric influences are discussed.
Chapter 11: The field test of four circular UHPCC-FST specimens under the
close-range TNT charge explosion with the scaled standoff distance of 0.12 ~ 0.14
m/kg
1/3 is presented. The dynamic responses of those specimens are analyzed by three
different methods, i.e., ALE method, velocity loading method and SDOF method, and
the velocity method is recommended by considering both the accuracy and efficiency
of computation.
Chapter 12: The residual seismic resistance (RSR) of UHPCC-FST specimens
after contact explosion is studied experimentally. The specimens are firstly subjected
to blast loadings, in which the TNT charge weights are 1 ~ 3 kg and the height of
bursts are set to 250 mm. Furthermore, the RSR of UHPCC-FST specimens are
examined through the low-frequency horizontal cyclic loading test in two perpendicular directions. A composite damage index is proposed to evaluate the RSR of
the post-blast columns.