Evaluation and study of blast loads on deck (concrete beam- slab) of regular bridges and proposing new approach for damage reduction

Document Type : Original Research

Authors
H. R. Ahmadi
M. Fahimi farzam
Y. Ghorbannejad
Department of Civil Engineering, Faculty of Engineering, University of Maragheh
Abstract
Given that terrorist operations have increased in recent decades, it is therefore necessary to confront the dangers of this phenomenon. The explosions can cause severe damage to buildings and cause the progressive and complete destruction of these structures. Blast stresses are one of the most destructive loads which a structure may experience. Many of the existing structures are vulnerable to loads caused by the blast wave, so their resistance to such loads should be investigated to identify critical points of structures. In the meantime, bridges are considered as the vital available structures for terrorist operations, but with respect to their importance, solutions must be provided to reduce the vulnerability of bridges subjected to explosive loads. This paper investigates the behavior of bridge under blast loads in different weights and distances. Several experiments samples have been modeled and analyzed under blast loads for validating the results at finite element ABAQUS software, and the analyses showed that this software is able to predict the behavior of studied systems under blast loads. In this case, a bridge that has been located in Tehran, Shahid Sanie' Khani bridge, was chosen and investigated by utilizing ABAQUS. This bridge was subjected to blast loading substance, TNT, in different weights of 45.4, 100, and 150 kg and in different distances of 0.5, 1.2, 1.83, 2.54, and 3.83 meters from the center area of the bridge’s slab. Additionally, a new system U-boot named was added to the initial model for investigating its influences under blast loading. To conclude, firstly, increasing the amount of exploding substance (in a fixed distance from the center of the slab) cause an increase in the slab displacement and subsequently the damage in the slab is being increased. Secondly, increasing the exploding substance from the center of the slab and assuming a fixed weight for it in both first and second cases showed that increase in the amount of distance could lead to decreasing the displacement in slab and subsequently the damages decreases. Finally, adding the U-boot system leads to incredible improvement in the whole model in comparison with the initial one.

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Modares Civil Engineering journal
Volume 20, Issue 4
November and December 2020
Pages 7-22