Investigating Cyclic and Pushover Performance of Different Metallic Yielding Dampers

One of the most widely used and applicable solutions for limiting the damages of earthquakes to steel structures is using Metallic Yielding Dampers as a type of passive devices to dissipate the received energy. Maintaining a proper balance in the design of these devices is a delicate matter as each of the different types have advantages and disadvantages. In this research, different types of metallic dampers are compared using finite element simulation which is performed by means of ABAQUS package. Modeling process is described and verified by comparing the results to a previously published experimental paper on the subject. For assuring more accuracy a mesh convergence analysis is performed to determine the suitable mesh size. Afterwards, cyclic and pushover analysis are performed on each damper and results are presented and discussed. Effective stiffness and damping of each damper, both general and average, is extracted using proper equations and finite element results. Finally, for deeper understanding of dampers behavior, internal forces of the dampers are derived and compared. It was shown that design equations are fairly accurate. As the height of the dampers increases, their effective stiffness and damping reduces and the dampers behavior leans towards flexural behavior. Based on cyclic and pushover analysis, Steel Plate Dampers (SPD) have the highest stiffness and energy dissipation. Also, SPD and Double Pipe Dampers (DPD) are the most suitable to reach a demanded stiffness, damping and have the most stable performance. At the end of the paper, a list of conclusions is presented

Cyclic behavior of an energy dissipation system with the vertical steel panel flexural-yielding dampers

In this study, an energy dissipation system of the vertical steel panel flexural-yielding dampers (VSPFYDs) system is provided and investigated using a numerical method. The aim of this study is to provide an energy absorption system to improve the hysteresis behavior and performance of steel slit dampers (SSDs). Hence, two types of VSPFYDs and SSDs systems with connection details are provided and developed numerical models for parametric study. Extensive parametric studies have been performed to evaluate and compare the proposed damper (VSPFYDs) with traditional SSDs. To evaluate the proposed dampers, the nonlinear finite element models were developed to predict the hysteretic behavior of VSPFYDs and SSDs using ABAQUS software and ultimately validated with the results of several test specimens. To evaluate the results of this study, a comparison is performed between the seismic parameters of SSDs and VSPFYDs. The results show that the vertical steel panel flexural-yielding dampers increase the seismic parameters compared to the steel slit dampers. Also, the results showed both VSPFYDs and SSDs showed flexural behavior. Finally, the stiffness degradation of dampers was investigated and found that the smallest VSPFYD with a height of 15 cm has the best performance in many aspects. Also, the results show that the details of the construction of the plate connections considerably affected the performance and hysteresis behavior of the VSPFYDs compared to SSDs