A case study on an innovative seismic performance evaluation procedure for irregular RC buildings

Assessing the structural capacity of an irregular structure requires appropriate and robust representation analytical model. Conventional procedures are flawed because they lack reversal effects higher modes. Therefore, more have been tested to accurately capture building-type structures. Some these may be classified as adaptive pushover techniques in which lateral load vector is revised instantaneously. These generally refer SRSS a modal combination rule superpose maximum values quantities. However, this results overestimated value. Furthermore, modes not included evaluation process. Hence, research, force-based multimode method was on plan-irregular building using code developed implemented into ZEUS-NL. First, eigenvalue analysis used obtain quantities considered building, subsequently, story shear forces were obtained forces. patterns calculated at each iterative step. Finally, pushed pattern up previously target displacement value three-step analysis. The first step run single-mode considering mode. After comparing fundamental period with constant threshold limit, it then decided whether two or analyses contribution both second third Neither nor CQC response quantities; instead, use envelope suggested. evaluating diagram drifts determined. outcomes later checked nonlinear dynamic results. It can concluded that result procedure good correlation top displacement–time traces plotted check ground motion record reveals values. Using record, interstory drift ratio–time graphs for level compared limit. Base shear–time history FAP. Lastly, shear–interstory relations investigate absorbed energy indicator damage. As result, RC structures, found accurate. its current form, reflects seismic behavior midrise buildings.