Abstract
In the present study, a window-type seismic control system (WSCS) using non-buckling slit dampers (NBSDs) was proposed and developed to address the disadvantages of conventional seismic control systems so that it can be effectively applied to existing reinforced concrete (RC) buildings. Materials testing was also conducted to examine the material performance and energy dissipation capacity of NBSD. A full-scale two-story test frame modeled from existing RC buildings with non-seismic details was subjected to pseudo-dynamic testing. As a result, the effect of NBSD-WSCS, when applied to existing RC frames, was examined and verified, especially as to its seismic retrofitting performance. In addition, based on material testing and pseudo-dynamic test results, a restoring force characteristics model was proposed to implement the nonlinear dynamic analysis of a test building retrofitted with NBSD-WSCS. Based on the proposed restoring force characteristics, nonlinear dynamic analysis was conducted, and the results were compared with those obtained by the pseudo-dynamic tests. Finally, in an attempt to commercialize this NBSD-based WSCS, nonlinear dynamic analysis was conducted on the entire RC building with non-seismic details retrofitted with NBSD-WSCS. The results showed that the RC frame (building) with no reinforcement applied underwent shear failure at seismic intensity of 200 cm/s2, a typical threshold applied in seismic design in Korea. In contrast, in the frame (building) retrofitted with NBSD-WSCS, only minor earthquake damage was expected, and even when the seismic intensity was set to 300 cm/s2, the maximum intensity that had been observed in Korea, only small or moderate seismic damage was expected. These results confirmed the effectiveness of the seismic retrofitting method using NBSD-WSCS developed in the present study.
Highlights
Based on the proposed restoring force characteristics, nonlinear dynamic analysis was conducted, and the results were compared with those obtained by the pseudo-dynamic tests
Based on the non-buckling slit dampers (NBSDs) material test and pseudo-dynamic test results, described in Sections 3 and 4, the restoring force characteristics of beams, columns, and reinforcing members (NBSD) were proposed to implement nonlinear dynamic analysis of the full-size two-story test frame retrofitted with the NBSD seismic retrofitting method
The modified Ramberg-Osgood (MRO) model was employed as a hysteresis model for the NBSD-based seismic control system because the model is suitable to simulate the hysteric behavior of steel slit dampers
Summary
Concrete structures may be highly prone to early degradation and damage, especially in their most vulnerable parts, if they have been improperly designed and constructed or built with inappropriate materials, or when the environmental conditions are severe This leads to a significant degradation in their safety, durability, and functionality, thereby increasing the frequency and scale of natural disasters and safety accidents. The aging and degradation of buildings and their structural performance are accelerated by the degradation of the performance and functionality of their concrete parts, and this degradation process is considered to be caused by a variety of factors, as mentioned above, such as the natural aging of structures; environmental changes, including climate change; quality errors in design and construction; and changes in the load condition due to extension or design change. When damage occurs or may occur, maintenance and retrofitting measures must be immediately taken to ensure safety
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