Abstract
Explicit finite element programme LS-DYNA was used to simulate a long-span steel reticulated shell under blast loading to investigate the structural dynamic responses in this paper. The elaborate finite element model of the Kiewitt-8 single-layer reticulated shell with span of 40 m subjected to central blast loading was established and all the process from the detonation of the explosive charge to the demolition, including the propagation of the blast wave and its interaction with structure was reproduced. The peak overpressure from the numerical analysis was compared with empirical formulas to verify the credibility and applicability of numerical simulation for blast loading. The dynamic responses of the structure under blast loading with different TNT equivalent weights of explosive and rise-span ratios were obtained. In addition, the response types of Kiewitt-8 single-layer reticulated shell subjected to central explosive blast loading were defined.
Highlights
Severe destruction of buildings and invaluable loss of properties are inevitable in most extreme loading events such as the collapse of World Trade Centre in ‘911’ and the increasingly common attacks by vehicle bomb in Iraq and Pakistan
This could be due to the influences of ground and other reflection effects which depend on the height of detonation of the blast data used in the empirical formulas, which may increase the peak overpressure of blast wave in free air
In view that the long-span spatial structure considered in this study was subjected to blast loading with scaled distance Z larger than 3.5 whereby the relatively constant relative error is about 30% and has minimal effect on the response types and rise-span ratio effect studied in this paper, it was reasonably acceptable that the numerical simulation of blast wave is applicable for this study
Summary
Severe destruction of buildings and invaluable loss of properties are inevitable in most extreme loading events such as the collapse of World Trade Centre in ‘911’ and the increasingly common attacks by vehicle bomb in Iraq and Pakistan. Explosive blast wave imposes high initial pressure with rapid decay in short duration onto structures whereby different empirical formulas reflecting the relationship between peak overpressure and scaled distance have been proposed [1,2,3,4,5]. The analysis of the structural dynamic response and failure modes for a typical Kiewitt-8 single-layer reticulated shell with span of 40m subjected to central blast loading using. The response types of the Kiewitt single-layer reticulated shell subjected to central explosive blast loading were defined and the effect of rise-span ratio and TNT equivalent weight on reticulated shell structure was investigated
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