Failure mode and damage assessment of segmental assembled pier under blast Impact
ZHANG Yuye1, YANG Xu1, FENG Jun2
1.Department of Civil Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
2.State Key Lab of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China
Abstract：In order to investigate failure mode and damage assessment method for segmental assembled piers under blast impact, 3-D solid separated models of integral pier with square section and segmental assembled pier under blast were established using the software ANSYS/LS-DYNA.The reliability of this simulation method was verified by comparing the numerical results and the blast test ones.By changing the blast’s TNT equivalent and blast distance, the stress variation, failure mode and damage mechanism of integral pier and segmental assembled one under different overpressure actions were contrastively analyzed, and the method for evaluating pier blast damage combined with pier section damage and its lateral displacement was proposed.Results showed that under combined action of blast impact and dead load, integral piers mainly exhibit shear failure and bending-shear failure, while segmental assembled piers present shear failure and local failure; under action of blast impact with different scaled distances, pier damage can be divided into 3 states of complete elasticity, partial elasticity and loss of elasticity; after segmental assembled piers are subjected to blast impact, larger relative rotating angle and displacement occur between segments to cause weakening of pier section and pier body lateral displacement; blast damage for both bridge piers of the two systems can be quantitatively evaluated with the combination method of section weakening and pier body lateral displacement.
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