Chapter 12
Experimental Study on the Residual
Seismic Resistance of UHPCC Filled
Steel Tube (UHPCC-FST) After Contact
Explosion
12.1 Introduction
In the past two decades, the threat of terrorist around the world has been on the rise, in
which explosive from car or luggage bomb has been the main means of terrorist attack
(Global Terrorism Database 2016). Based on the statistics, from 1970 to 2017, there
have been more than 180,000 terrorist attacks occurred around the world, including
more than 88,000 bombings, 19,000 assassinations, and 11,000 kidnappings (Global
Terrorism Database 2018). The vital buildings and infrastructures, e.g., bridges, are
the main terrorist attacking targets. As the key load carrying members, the damage
and even failure of building or bridge columns due to blast loading may induce the
collapse of whole superstructures, which will further induce a large number of casualties and property losses. Therefore, the studies on the blast resistance and the postblast behavior, e.g., the residual axial load bearing capacity and seismic resistance of
above columns are very important and essential for assessing the performance of the
building and bridge structure against the potential terroristic or accidental explosions.
Most of the existing studies were performed to examine the dynamic performance and failure mode of reinforced concrete (RC) column under various explosive
scenarios, for both normal strength concrete (NSC) (Shi et al. 2008; Wu et al. 2011;
Williamson et al. 2010, 2011a, 2011b; Kyei et al. 2017; Li et al. 2017a) and Ultra-high
performance concrete (UHPC) (Xu et al. 2016; Li et al. 2015a, b, c, 2017b), respectively. It was derived that the RC columns may suffer global damage such as flexure
or localized damage such as spalling of concrete cover and diagonal shear cracks.
Furthermore, although the reinforced UHPC column exhibited better blast resistance
and residual axial load capacity compared to normal RC columns, both NSC and
UHPC materials are still prone to generate debris under blast loading, which might
cause secondary damage to personnel and equipment. In recent years, concrete-filled
steel tube (CFST) columns has been gained wide applications in building and bridge
engineering due to their superior load-bearing capacity and seismic resistance and
excellent ductility and fatigue properties than those of the conventional RC columns.
The steel tube of CFST column, with different section profiles such as rectangular,
© Science Press 2021
Q. Fang et al., UHPCC Under Impact and Blast,
https://doi.org/10.1007/978-981-33-6842-2_12
397
Experimental Study on the Residual
Seismic Resistance of UHPCC Filled
Steel Tube (UHPCC-FST) After Contact
Explosion
12.1 Introduction
In the past two decades, the threat of terrorist around the world has been on the rise, in
which explosive from car or luggage bomb has been the main means of terrorist attack
(Global Terrorism Database 2016). Based on the statistics, from 1970 to 2017, there
have been more than 180,000 terrorist attacks occurred around the world, including
more than 88,000 bombings, 19,000 assassinations, and 11,000 kidnappings (Global
Terrorism Database 2018). The vital buildings and infrastructures, e.g., bridges, are
the main terrorist attacking targets. As the key load carrying members, the damage
and even failure of building or bridge columns due to blast loading may induce the
collapse of whole superstructures, which will further induce a large number of casualties and property losses. Therefore, the studies on the blast resistance and the postblast behavior, e.g., the residual axial load bearing capacity and seismic resistance of
above columns are very important and essential for assessing the performance of the
building and bridge structure against the potential terroristic or accidental explosions.
Most of the existing studies were performed to examine the dynamic performance and failure mode of reinforced concrete (RC) column under various explosive
scenarios, for both normal strength concrete (NSC) (Shi et al. 2008; Wu et al. 2011;
Williamson et al. 2010, 2011a, 2011b; Kyei et al. 2017; Li et al. 2017a) and Ultra-high
performance concrete (UHPC) (Xu et al. 2016; Li et al. 2015a, b, c, 2017b), respectively. It was derived that the RC columns may suffer global damage such as flexure
or localized damage such as spalling of concrete cover and diagonal shear cracks.
Furthermore, although the reinforced UHPC column exhibited better blast resistance
and residual axial load capacity compared to normal RC columns, both NSC and
UHPC materials are still prone to generate debris under blast loading, which might
cause secondary damage to personnel and equipment. In recent years, concrete-filled
steel tube (CFST) columns has been gained wide applications in building and bridge
engineering due to their superior load-bearing capacity and seismic resistance and
excellent ductility and fatigue properties than those of the conventional RC columns.
The steel tube of CFST column, with different section profiles such as rectangular,
© Science Press 2021
Q. Fang et al., UHPCC Under Impact and Blast,
https://doi.org/10.1007/978-981-33-6842-2_12
397