Numerical Simulation of steel Wall-Post Damage Based on Progressive Damage Index under Explosion Loading

Given Iran’s location in the Middle East, which is a special region, and the devastating wars and explosions, structural members are prone to damage. On the other hand, masonry infilled-walls are commonly used in most countries in the reinforced skeleton structures. Moreover, since the non-structural infilled-walls fail under seismic dynamic loading, it is substantially important to understand the behaviour of structural members and predict solutions to reinforce these structures. The local seismic design codes suggest the use of vertical and horizontal steel braces to improve the seismic resistance of infilled-walls. However, very few studies on the seismic reinforcement of non-structural members have assessed the possible damage to steel-reinforced systems under direct impact of explosion. This paper explores the damage caused to steel wall posts as the tie for infilled-walls under explosive loading. Hence, a 3-story concrete frame with an earthquake-resistant infilled-wall was subjected to explosive loading in ABAQUS on the large dimension using two 300- and 1000-kg explosive masses at the 5-m and 10-m distances from the structure foot on the ground level. The progressive damage index including the ductile metal damage and shear damage indices for the steel material was used as the criterion in numerical assessments. The research results revealed that with an increase in explosive mass and a decrease in explosion radius, the damage escalates and the omission of structural members is more probable, resulting in a more critical explosion. It is also concluded that the damage to the lower stories is critical. Therefore, the resistance of the reinforcement systems used to increase seismic resistance should be examined under explosive loading.

کلیدواژه ها:

Masonry infilled-wall ، Seismic Design ، Explosive Loading ، Damage Index