Browsing by Author "Carbas, Serdar"

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Examining the Effects of Different Seismic Base Isolators on the Seismic Behavior of a Real-Size Steel Truss Structure
(2025) Carbas, Serdar; Taymus, Refik Burak; Özdemir, Mehmet
In this study, the seismic behavior of a real-size steel truss structure is examined for elastomeric isolator, double friction pendulum isolator, and fixed support conditions. Hence, the main aim of the study is to examine which type of support is safer for seismic response of a real-size steel truss structure, considering the structural reactions under earthquake and other acting load effects. To do this, the structural models generated with three different support conditions are examined in detail in terms of earthquake characteristic according to conducted structural seismic analyzes. The real-size steel truss structures are modeled in SAP2000 structural analysis program and are designed in accordance with the Turkish Building Earthquake Code-2018 specifications. The snow and wind loads acting on the truss structures are calculated in the direction of TS EN 1991-1-3 and TS EN 1991-1-4 specifications, respectively. The earthquake forces are implemented to the truss structure through mode superposition method. Finally, the truss structure is comparatively examined in terms of the structural weight, base shear force, natural vibration period, and relative drift. As regards to the obtained results, it has been observed that the seismic responses of the steel truss structure are remarkable better when the seismic base isolator is implemented into the structure.
Seismic Design Optimization of Space Steel Frame Buildings Equipped With Triple Friction Pendulum Base Isolators
(Elsevier, 2024) Taymus, Refik Burak; Aydogdu, Ibrahim; Carbas, Serdar; Ormecioglu, Tevfik Oguz
To increase the seismic resilience of structures, it is necessary to utilize seismic isolation to increase structural periods and reduce story drifts. When seismic isolation is implemented, structures are capable of deforming by remaining within safe limits. Thus, more seismically resilient designs are achieved compared to conventional fixed-based structures since lighter structural design weights are attained. The principal aim of this study is to achieve the comparative design optimization of space steel frame buildings equipped with seismic base isolation and to examine the effect of seismic base isolation on optimum structural design weight by comparing the same structures with conventional rigid-based ones. For seismic base isolation, triple friction pendulums are implemented into steel frame buildings. For this aim, four different space steel frame buildings with 4-, 6-, 8-, and 10-story are treated as design examples. A novel design optimization algorithm is encoded, which includes nature-inspired metaheuristic artificial bee colony, crow search, and Archimedes optimization algorithms to achieve design optimizations of triple friction pendulums equipped with seismic-isolated space steel frame buildings. The practice code provisions of load and resistance factor design specification for structural steel buildings have been applied to control the structural design constraints of inter-story drift, top-story drift, strength, displacement, and connections geometry of beams and columns. Eventually, it has been remarked that seismic base isolation significantly reduces the structural optimal design weight of space steel frame buildings.