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A platform for research: civil engineering, architecture and urbanism
Residual Axial Capacity of Seismically Designed RC Bridge Pier After Near-Range Explosion of Vehicle Bombs
The terrorist attacks on bridges have been increasing dramatically in recent years. Under explosions, piers will lose partial axial bearing capacity, resulting in the partial or complete collapse of the whole bridge. The dynamic behaviors and axial capacity of the RC bridge piers with seismic design subjected to near-field explosion of vehicle bombs were numerically concerned in this chapter. Firstly, the erosion algorithm, Fluid–Structure Interaction method and the multi-material Arbitrary-Lagrangian–Eulerian algorithm in LS-DYNA, was adopted and a reliable finite element analysis (FEA) approach was established. The FEA approach was validated by comparing with the blast overpressure, column deflection, spalling range of concrete cover, and residual axial bearing capacity of three groups of tests. Secondly, explosion scenarios for vehicle bombs on bridge piers were designed to meet three different earthquake intensity levels (EI7–EI9) in accordance with Chinese specifications JTG/T 2231-01-2020 for prototype bridge piers and FEMA-428 for sedan bombs. Based on residual axial bearing capacity, the blast resistance of the above three seismically designed bridge piers was evaluated under two typical vehicle bombs, and the effects of seismic detailing were quantitatively assessed. On the basis of seismic design and detailing provisions, a low-complexity design approach was recommended. This study provides useful references on RC bridge piers under close-in explosions of vehicular bombs, such as damage assessment, blast-resistant design, and further strengthening.
Residual Axial Capacity of Seismically Designed RC Bridge Pier After Near-Range Explosion of Vehicle Bombs
The terrorist attacks on bridges have been increasing dramatically in recent years. Under explosions, piers will lose partial axial bearing capacity, resulting in the partial or complete collapse of the whole bridge. The dynamic behaviors and axial capacity of the RC bridge piers with seismic design subjected to near-field explosion of vehicle bombs were numerically concerned in this chapter. Firstly, the erosion algorithm, Fluid–Structure Interaction method and the multi-material Arbitrary-Lagrangian–Eulerian algorithm in LS-DYNA, was adopted and a reliable finite element analysis (FEA) approach was established. The FEA approach was validated by comparing with the blast overpressure, column deflection, spalling range of concrete cover, and residual axial bearing capacity of three groups of tests. Secondly, explosion scenarios for vehicle bombs on bridge piers were designed to meet three different earthquake intensity levels (EI7–EI9) in accordance with Chinese specifications JTG/T 2231-01-2020 for prototype bridge piers and FEMA-428 for sedan bombs. Based on residual axial bearing capacity, the blast resistance of the above three seismically designed bridge piers was evaluated under two typical vehicle bombs, and the effects of seismic detailing were quantitatively assessed. On the basis of seismic design and detailing provisions, a low-complexity design approach was recommended. This study provides useful references on RC bridge piers under close-in explosions of vehicular bombs, such as damage assessment, blast-resistant design, and further strengthening.
Residual Axial Capacity of Seismically Designed RC Bridge Pier After Near-Range Explosion of Vehicle Bombs
Springer Tracts in Civil Engineering
Wu, Hao (author) / Cheng, Yuehua (author) / Ma, Liangliang (author)
2024-08-20
33 pages
Article/Chapter (Book)
Electronic Resource
English
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