Abstract
The purpose of this study was to experimentally evaluate the effect of a hinged steel damping system on the shear behavior of a nonductile reinforced concrete frame with an opening. For the experimental test, a total of three full-scale reinforced concrete frame specimens were planned, based on the “no retrofitting” (NR) specimens with non-seismic details. The main research questions were whether the hinged steel damping system is reinforced and whether torsion springs are installed in the hinged steel damping system. From the results of the experiment, the hinged steel damping system (DR specimen) was found to be effective in seismic retrofitting, while isolating the opening of the reinforced concrete (RC) frame, and the torsion spring installed at the hinged connection (DSR specimen) was evaluated to be effective in controlling the amount of deformation of the upper and lower dampers. The strength, stiffness, and energy dissipation capacity of the DSR specimen were slightly improved compared to the DR specimen, and it was confirmed that stress redistribution was induced by the rotational stiffness of the torsion spring installed in the hinge connection between the upper and lower frames.
Highlights
The number of structures has increased with industrial development worldwide, there are many vulnerable structures
As a method for improving the performance of these structures, the seismic retrofitting of structures has attracted the attention of many researchers, and different methods have been developed for the seismic retrofitting of structures
As for the axial force applied to the specimen, 10% of the column axial compressive strength was designed to act as a sustained vertical load using two oil jacks and a loading frame fixed to the reaction force floor
Summary
The number of structures has increased with industrial development worldwide, there are many vulnerable structures. In addition to the aforementioned structural strengthening methods, various energy dissipating devices, such as dampers, first introduced by Kelly et al [13], have been invented to improve the seismic performance of structures. The main goal of passive control systems, such as metal yield dampers, is to dissipate the input energy by inelastic deformation, so that the energy acting on the structure during an earthquake is dissipated by the hysteresis behavior of these elements. It reduces the contribution of primary structural elements and limits the degree of damage to the structure. The simplest metallic damper is a single steel plate, generally welded to the structure, indicated in the literature as a shear panel damper (SPD) [16,17]
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