Framework for Modeling and Assessing the Vulnerability of Reinforced Concrete Frames During Post-Earthquake Fire Incidents
Abstract
Post-earthquake fire (PEF) is a significant hazard that can be caused by broken gas lines, damaged electrical systems, or other failures. They can also be exacerbated by problems with the water supply and sprinkler systems. PEF can cause significant damage to buildings and infrastructure which reduces the safety provided for the evacuation process. To mitigate the risks associated with PEFs, it is crucial to comprehend the effect of seismic damage on the building's behaviour during fire exposure. There is a lack of research in this area. This research aims at assessing the behaviour of RC frames exposed to PEF.
The research started by analyzing the effect of concrete cracks and cover spalling on the temperature distribution within concrete sections. A comprehensive parametric study is conducted to evaluate variations in the length of spalled concrete cover in typical reinforced concrete elements experiencing lateral loads. An expression is then proposed to estimate the spalled length based on the lateral drift, axial load ratio, and properties of the section.
A simplified method is then suggested to analyze reinforced concrete frames while taking into account the effect of seismic damage. The results of this method were found to be promising when compared to previous experimental and numerical studies.
The thesis ends by proposing a fragility analysis framework for RC frames exposed to PEF. The framework accounts for uncertainties in the fire, loads, and material properties. The framework was applied to a sample RC frame. PEF was shown to result in a rapid collapse of the considered frame, reducing the evacuation time for the occupants.