The effect of fluid viscous damper connections on the seismic performance of steel-concrete composite structural systems

In this thesis study, the seismic performance of fluid viscous dampers (FVD), integrated into steel–concrete composite structural systems, has been investigated. FVDs are passive seismic control mechanisms that improve the behavior of structural systems by dissipating seismic energy, particularly in high-rise buildings. Within the scope of the analysis, a building model classified as a high-rise structure was evaluated using both a Conventional Structural System (GTS) and seven different Enhanced Structural System (ZTS) variants. The effects of various FVD placement configurations on story displacements, interstory drifts, shear forces, moment distributions, and energy dissipation capacities were comparatively analyzed. The analyses were conducted using linear static, modal, and time history analysis methods in accordance with the Turkish Building Earthquake Code (TBDY-2018) and the Steel Structures Design, Calculation and Construction Regulation (ÇYTHYE-2016). The results indicate that FVD systems, particularly when integrated into "chevron" type bracing frames, significantly reduce lateral displacements, balance internal force distributions, and enhance overall damping performance. Additionally, design evaluations were carried out in terms of architectural compatibility and cost efficiency. The concluding section offers recommendations and inferences for future studies. This study aims to contribute to engineering practice regarding the design integration of FVD systems into steel-concrete composite structural systems.