Evaluation of Sensitivity Analysis Methods in RC Frame Exposed Post-Earthquake Fire

In this research, a 7-story three-dimensional structure with 4span (5-meter) with a square plan is considered. After the initial design, the mid-frame of the structure has been selected as a frame for mechanical-thermal analysis. In this research, pushover analysis is used to simulate structural behavior in seismic load. Three levels of IO, LS, and CP are considered for assessing the behavior of the structure in the post-earthquake fire scenario in the pushover analysis. The failure time of a concrete frame decreases in post-earthquake fire loading by increasing the level of performance. This reduction is 51% for the LS level and 29% for the CP level. It shows that rupture time has the highest sensitivity to seismic load. At all performance levels, among the design parameters, the yield stress of the armature has the highest sensitivity among other variables. The modulus of elasticity of the armature and the length of the span have the least sensitivity among different parameters.