Chapter 10
Residual Axial Capacity of UHPCC-FST
Column Under Contact Explosion
10.1 Introduction
Aiming to produce the mass casualties, visually dramatic destruction, significant
economic aftershocks and fear among the population, civil infrastructures have gradually been becoming the potential attacking targets in the modern terrorism activities
(Fujikura and Bruneau 2008). For example, during the 80 years from 1920 to 2000,
nearly 900 terrorist attacks were related to the above-ground transportation systems,
especially in the later 30 years from 1970 to 2000 (Jenkins 2001). Comparably, the
much easier accessibility for bridge makes it more prone to be the potential targets
under close-range even contact explosion attacks, which has been recognized by
both the engineering community and public officials, e.g., Federal Highway Administration (FHWA) and American Association of State Highway and Transportation
Officials (AASHTO) (Fujikura et al. 2008; Williamson et al. 2010 FHWA 2003). For
bridge structures, as the key load carrying members, the damage and even failure
of bridge columns may induce the collapse of the whole bridge superstructures.
Therefore, the studies on the post-blast residual axial capacity of bridge columns,
particularly for some extreme scenarios (i.e., the contact explosion), are very important and essential for assessing the performance of the bridge structures against the
potential terroristic or accidental explosions.
Most existing related works are mainly concentrated on the reinforced concrete
(RC) columns, including the blast resistance (Xu et al. 2016; Kyei and Braimah 2017;
Astarlioglu and Krauthammer 2014) and the post-blast behavior of the columns
(Li et al. 2012, 2017; Wu et al. 2011a; Bao and Li 2010). It has been drawn that
RC columns may suffer global damage such as flexure or localized damage such
as spalling of concrete cover and diagonal shear cracks. Concrete-filled steel tube
(CFST) columns has recently gained wide applications in bridge engineering due to
their superior load-bearing capacity and seismic resistance than those of the conventional RC columns. The steel tube of CFST column, with different section profiles
such as rectangular, hexagonal, circular and corrugated section which can help to
enhance the ductility and local stability of the column (Farahi et al. 2016, 2017;
© Science Press 2021
Q. Fang et al., UHPCC Under Impact and Blast,
https://doi.org/10.1007/978-981-33-6842-2_10
319
Residual Axial Capacity of UHPCC-FST
Column Under Contact Explosion
10.1 Introduction
Aiming to produce the mass casualties, visually dramatic destruction, significant
economic aftershocks and fear among the population, civil infrastructures have gradually been becoming the potential attacking targets in the modern terrorism activities
(Fujikura and Bruneau 2008). For example, during the 80 years from 1920 to 2000,
nearly 900 terrorist attacks were related to the above-ground transportation systems,
especially in the later 30 years from 1970 to 2000 (Jenkins 2001). Comparably, the
much easier accessibility for bridge makes it more prone to be the potential targets
under close-range even contact explosion attacks, which has been recognized by
both the engineering community and public officials, e.g., Federal Highway Administration (FHWA) and American Association of State Highway and Transportation
Officials (AASHTO) (Fujikura et al. 2008; Williamson et al. 2010 FHWA 2003). For
bridge structures, as the key load carrying members, the damage and even failure
of bridge columns may induce the collapse of the whole bridge superstructures.
Therefore, the studies on the post-blast residual axial capacity of bridge columns,
particularly for some extreme scenarios (i.e., the contact explosion), are very important and essential for assessing the performance of the bridge structures against the
potential terroristic or accidental explosions.
Most existing related works are mainly concentrated on the reinforced concrete
(RC) columns, including the blast resistance (Xu et al. 2016; Kyei and Braimah 2017;
Astarlioglu and Krauthammer 2014) and the post-blast behavior of the columns
(Li et al. 2012, 2017; Wu et al. 2011a; Bao and Li 2010). It has been drawn that
RC columns may suffer global damage such as flexure or localized damage such
as spalling of concrete cover and diagonal shear cracks. Concrete-filled steel tube
(CFST) columns has recently gained wide applications in bridge engineering due to
their superior load-bearing capacity and seismic resistance than those of the conventional RC columns. The steel tube of CFST column, with different section profiles
such as rectangular, hexagonal, circular and corrugated section which can help to
enhance the ductility and local stability of the column (Farahi et al. 2016, 2017;
© Science Press 2021
Q. Fang et al., UHPCC Under Impact and Blast,
https://doi.org/10.1007/978-981-33-6842-2_10
319