Blast and Impact Loading and Response of Structures
Full Session with Abstracts
The objective of this study is to discuss blast assessment and design of the connections between a blast resistant modular building (BRM) and pile foundation considering vulnerability of the BRM. First, blast design of the structural components of the BRM and the connections between them is performed. In addition, heat transfer analysis of the building in a fire event is also studied.
For the design of pile foundation connection, non-linear time history blast response analyses are performed using finite element analysis. Several sensitivity cases are considered in the analysis. Detailed modeling analysis was done using a general purpose finite element software package.
The analysis results indicate that with the frozen layer, the maximum displacement at a corner pile head is approximately 1.0 mm. Removing the frozen layer from the model would increase the displacement to approximately 3.9 mm. Both frozen layer and radiation damping help reduce the displacement of the building and piles. Resultant occupant accelerations in all sensitivity cases were less than 0.6 g. The Head Injury Criterion (HIC) index is negligible in all cases to cause any damage to a personnel. However, a personnel might lose his/her balance and impact his/her head to the floor. If falling like a rigid body, head impact velocity might range from 5.3 m/s to 7.3 m/s and there will be 50% to near 100% that his head will be fractured.
Heat transfer analysis of the building is performed during two fire scenarios. The first scenario includes external jet fire of 350 kW/m2 applied on one long wall of the building for a duration of 5 minutes. In the second scenario, two adjacent walls building is under 11 kW/m2 fire for two hours. The analysis results show that the global collapse of the building is not expected and the inside surface temperate of the wall reaches to maximum of 35 ˚C after 5 minutes. In scenario 2, the maximum air temperature inside the building reaches to 26 ˚C after 2 hours and the thermal dose unit remains below the critical values for human injury.