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Yayın 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 ProgramıIn 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.Yayın Comparative study for earthquake performance of steel buildings with seismic isolator and fixed based steel buildings with damper(Işık Üniversitesi, 2022-01-28) Abdi, Abdullahi Abdiaziz; Umut, Önder; Işık Üniversitesi, Lisansüstü Eğitim Enstitüsü, İnşaat Mühendisliği Yüksek Lisans ProgramıEarthquake causes huge loss of lives and enormous damages to properties every year. In order to understand and avoid such damages, different types of seismic isolators have been used. To get the optimal and effective types of seismic isolators, a comparison study of three same-sized 12-storey steel buildings with conventional steel braced frames, and lead rubber bearing (LRB) fixed-based with fluid viscous dampers (FVD) is conducted and their seismic performance enhancements are evaluated using SAP2000 software. Researchers suggest that the seismic isolator building can survive seismic agitation behaviors such as uplifts, stress against ruptures, shears, cracking and displacements. In the study, three same-sized steel structures with different seismic isolator models, special moment and concentric moment frames of all three structures (SMF and SCBF) respectively, earthquake location (Kocaeli Turkey, Yarimca, 8/17/1999) have been selected, performing non-linear time history analysis, non-linear evaluation of dynamic behavioral building response spectrum analysis under load varying time function and design parameters are conducted. As a result of this study, conventional buildings, lead rubber bearing buildings and fluid viscous damper building storey displacement, inter-storey drifts, mode shape, shear force, axial force, base shear, and time history analysis for nonlinear dynamic structural responses are evaluated and compared with the conventional, lead rubber bearing and fluid viscous damper building, according to American Institute of Steel Construction (AISC 360-16).
