Assessing the Effect of Irregular Stiffness on Nonlinear Performance of Moment Frame in the form of Calculating the Probability of Collapse at Height for far-field earthquake Considering the Effect of Panel Zone

The buildings with irregular geometric forms in the plan are very prone to torsion at earthquake time. In this research study, the structures were designed to evaluate the behavior of irregular structures, and then response-history analyses were performed. The models presented in this work include a validation model based on the baseline article, a four-story software model with irregularities in the first and third floors heights in balanced and strong panel zone, an eight-story software model with irregularities in the first, third and fifth floors heights in balanced and strong panel zone. The results revealed the stiffness and the strength of the panel zone significantly affect the performance of steel moment frame structures. Also, the seismic performance of moment frames will be improved by considering double plates and relative displacement is better controlled. Increasing the thickness too much, however, increases the beams' deformation and the demand ratio to capacity in the beams. Observations indicated the panel zone must be reinforced to the dough joint in the beam, then in the panel zone, and finally in the column. If the resistance ratio of the panel zone to the beam is ۰.۸ to ۱, then the panel zone will be balanced and flow simultaneously.

کلیدواژه ها:

Steel structures ، Panel zone ، irregular structure ، Incremental Dynamic Analysis