Experimental study on seismic performance of seismic-damaged RC frame retrofitted by prestressed steel strips
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Experimental study on seismic performance of seismic‑damaged RC frame retrofitted by prestressed steel strips Ruyue Liu1 · Yong Yang2 Received: 9 May 2019 / Accepted: 12 August 2020 © Springer Nature B.V. 2020
Abstract Prestressed steel strips were used to provide quick retrofit for seriously damaged structures after earthquake, for the purpose of improving the seismic resistance capacity of seismicdamaged reinforced concrete frames in case of aftershock and providing possible conditions for comprehensive post-earthquake strengthening. In this paper, the retrofitting effect of retrofitted damaged structure was validated by means of pseudo-static test on 1/2 scaled undamaged RC frame with single span and three stories and retrofitted seismic-damaged structure using prestressed steel trips. The comparison of seismic performance including bearing capacity, stiffness, ductility and energy dissipation capacity was discussed to verify the retrofitting effect. According to the results, it was found that post-earthquake reinforced concrete frame retrofitted by prestressed steel strips could develop similar seismic performance as original frame and reduce the potential in structural failure when subjected again to an earthquake. The results also indicated that prestressed steel strips could be taken as a quick retrofit technology, providing effective and quick strengthening of damaged structure and it could help avoid unexpected loss of life and economy after earthquake. Keywords Retrofitting methods · Prestressed steel strips · Seismic-damaged structure · Seismic performance · Experimental study
1 Introduction As it known to us that structures might suffer from serious damage during earthquake, and in the aftermath of earthquake, seismic-damaged structure might experience undesirable failures or collapses in the event of aftershocks. As the most commonly used structural system in China, RC frames are likely to suffer serious damage due to limited lateral * Ruyue Liu [email protected] 1
School of Civil Engineering, Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering, Fujian University of Technology, Fuzhou 350118, Fujian, China
2
Department of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China
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Vol.:(0123456789)
Bulletin of Earthquake Engineering
stiffness and resistance when subjected to an earthquake. Based on a series of investigations of damages on structures, it turns out that weak-story mechanism of structures was commonly seen during earthquake, with serious cracking in concrete, exposure of reinforcing and large story deformation, resulting in severe crush of concrete and significant loss of bearing capacity. Nevertheless, some structures remained enough residual capacity to avoid collapse after earthquake, which was considered to be repairable. Generally speaking, it is common that the seismic-damaged RC frames would be dismantling after earthquake to avoid unexpected loss of life in case of potential disa
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