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This study evaluates metallic yield dampers, specifically slit steel dampers, for protecting steel beam-to-column connections during seismic events. Finite element model simulations were conducted for the damper and its connection. Analysis of circular parameters, like the radius slot, showed that appropriately sized slit dampers exhibit advantageous seismic behavior. Moment-rotation, hysteresis curves, and plastic stresses comparisons indicate efficient energy absorption. The maximum moment was 25% lower than conventional samples. The slit steel damper model with a ductility factor of 3.5 allows significant plastic deformation before potential failure. Results emphasize the slit damper's potential for optimal performance in steel frames, suggesting its use for efficient energy absorption. [ABSTRACT FROM AUTHOR]

In our communities, the crucial role played by basic facilities such as hospitals, communication systems, roads, and bridges is highlighted. They are considered essential, particularly in the aftermath of natural disasters when services need to be sustained. The implementation of control systems during structural design allows structures to handle dynamic responses during turbulent events. Attention is typically given to the structural configuration during the design of a structural control system. The response of a structure during earthquakes can be influenced by the interaction with the underlying soil. In this study, the effects of dynamic response are assessed through numerical simulations, considering soil-structure interaction on a 3D moment-resisting steel frame with a viscous fluid-type energy dissipation system. Analysis includes seven seismic records selected based on frequency and content source, corresponding to building code design response spectra for earthquake-prone areas. The soil profiles used in the analysis align with seismic hazard areas. A 12-story building with a viscous damper underwent nonlinear time history analysis to study the effects of implementing or ignoring soil-structure interaction. When soil-structure interaction is taken into account, the results show a significant increase in dynamic response that affects story drift, displacement, and top floor acceleration. [ABSTRACT FROM AUTHOR]

The main purpose of this paper is to propose a model for estimating the hysteresis damping ratio of moment steel frames and compare them with the results obtained using direct displacement-based design. In this study, different models of steel bending frames were examined by using several type of analysis to obtain this ratio. Thirty-steel frame models with 3, 6, 9, 12, and 15 floors and 3 and 6 bay with 6 m span length were analyzed and evaluated. The results showed that the equivalent damping ratio at the level of safety based on Jacobsen and Jennings, and the values of the equivalent damping relationships according to FEMA-440 vary from the empirical formula proposed in displacement-based design-2012. Therefore, in the ductility domain the exponential relationship form was more consistent with the results used. A new formula was proposed to calculate the hysteresis damping ratio, and it is more accurate than the empirical formula proposed in displacement-based design-2012. [ABSTRACT FROM AUTHOR]

The current work discusses optimizing the structural design of reinforced high strength concrete rectangular sections under design loads. Using a least-cost design criterion and minimal design variables, an analytical approach to the problem is devised. A nonlinear mathematical programming format for the formulation of the problem is among the things that are demonstrated. To demonstrate how the formulation can be used in line with the ACI 318-08 standard, several typical cases are given. The outcomes are compared to those obtained from existing design practice. The ideal solution demonstrates unequivocally that significant reductions in the anticipated absolute costs of the building materials to be employed are possible and without making significant changes, this method may be expanded to address other portions. [ABSTRACT FROM AUTHOR]