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Residual Axial Capacity of RC Bridge Piers After Contact Explosion
The bridge pier, when destroyed by accidental or planned explosions, will experience a reduction in its ability to bear weight along its axis. This can lead to the partial or full collapse of the whole bridge structure. This chapter focuses on developing blast-damage evaluation and blast-resistant design methods for bridge piers. It investigates the dynamic behaviors and residual axial load-bearing capacities of RC piers that are exposed to contact explosions. Initially, a total of five RC piers with a circular cross-section and a 1/2-scale model are constructed. Each pier has a height of 3 m and a diameter of 450 mm. The field contact explosion test is performed on three pier specimens using TNT charges of 0.5 kg, 1.0 kg, and 2.0 kg, respectively. Subsequently, the three piers that have been damaged by an explosion, together with two undamaged piers, are transferred to the laboratory for the purpose of conducting experimental tests on their ability to withstand axial loads. These tests are carried out using a hydraulic testing equipment. The test data acquired includes the incident overpressure-time histories, quantitative post-blast damage profiles of piers, and the complete curves of axial force–displacement. Furthermore, accurate finite element models are established for both the contact explosion and subsequent axial compression testing. The numerical simulations are conducted using the multi-material Arbitrary-Lagrangian–Eulerian method, Fluid–Structure Interaction, and erosion methods implemented in the LS-DYNA FE program. The accuracy of the material model and finite element analysis technique is thoroughly confirmed by comparing the numerical simulated results with the test data. In addition, a set of numerical simulations is performed on the prototype bridge piers that are designed to withstand seismic activity. The purpose of these simulations is to investigate the effects of different parameters on the damage mode, residual ALC, and the associated damage index of the piers. After conducting parametric studies, a number of blast-resistant design recommendations are put forward for the prototype RC bridge piers to protect against contact explosions.
Residual Axial Capacity of RC Bridge Piers After Contact Explosion
The bridge pier, when destroyed by accidental or planned explosions, will experience a reduction in its ability to bear weight along its axis. This can lead to the partial or full collapse of the whole bridge structure. This chapter focuses on developing blast-damage evaluation and blast-resistant design methods for bridge piers. It investigates the dynamic behaviors and residual axial load-bearing capacities of RC piers that are exposed to contact explosions. Initially, a total of five RC piers with a circular cross-section and a 1/2-scale model are constructed. Each pier has a height of 3 m and a diameter of 450 mm. The field contact explosion test is performed on three pier specimens using TNT charges of 0.5 kg, 1.0 kg, and 2.0 kg, respectively. Subsequently, the three piers that have been damaged by an explosion, together with two undamaged piers, are transferred to the laboratory for the purpose of conducting experimental tests on their ability to withstand axial loads. These tests are carried out using a hydraulic testing equipment. The test data acquired includes the incident overpressure-time histories, quantitative post-blast damage profiles of piers, and the complete curves of axial force–displacement. Furthermore, accurate finite element models are established for both the contact explosion and subsequent axial compression testing. The numerical simulations are conducted using the multi-material Arbitrary-Lagrangian–Eulerian method, Fluid–Structure Interaction, and erosion methods implemented in the LS-DYNA FE program. The accuracy of the material model and finite element analysis technique is thoroughly confirmed by comparing the numerical simulated results with the test data. In addition, a set of numerical simulations is performed on the prototype bridge piers that are designed to withstand seismic activity. The purpose of these simulations is to investigate the effects of different parameters on the damage mode, residual ALC, and the associated damage index of the piers. After conducting parametric studies, a number of blast-resistant design recommendations are put forward for the prototype RC bridge piers to protect against contact explosions.
Residual Axial Capacity of RC Bridge Piers After Contact Explosion
Springer Tracts in Civil Engineering
Wu, Hao (author) / Cheng, Yuehua (author) / Ma, Liangliang (author)
2024-08-20
32 pages
Article/Chapter (Book)
Electronic Resource
English
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