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    Comparison study on the effect of diaphragm types and slab voids on planner irregular asymmetrical structures using time history analysis
    (Işık Üniversitesi, 2022-09-06) Aldaddou, Amin Ammar; Umut, Önder; Işık Üniversitesi, Lisansüstü Eğitim Enstitüsü, İnşaat Mühendisliği Yüksek Lisans Programı
    In the past years plan-irregular structures with different diaphragm types have been limitedly studied regarding their seismic performance using nonlinear static procedures, which limited the application of those methods to existing irregular structures. In this study, the effect of gap existing and flexibility in the diaphragms on asymmetrical irregular structures is studied by free vibration analysis, equivalent lateral force method, and nonlinear time history analysis approach using 11 different earthquake records comparing two two-story similar steel structures, one with rigid diaphragm for both stories, and the other with flexible diaphragm in the second story and a large void in its second story slab. Both are irregular structures with re-entrant corner. It is found that the existence of the large void and diaphragm flexibility affect the period and natural frequency of the structures, increase the joint displacements and joint drifts, increase the base shear, increase the internal forces in beams and columns significantly specially in the critical places such as re-entrant corners. So overall, the study showed that irregular structures can be highly influenced and dramatically change its behavior when the existence of voids in the diaphragms, and when the diaphragms act as flexible diaphragm rather than rigid diaphragms.