Abstract
The purpose of this study was to investigate the thermal and cyclic behaviors of fire-damaged walls designed with different failure modes, aspect ratios and heated areas. These cyclic behaviors include temperature distribution, maximum lateral load, stiffness, ductility, and energy dissipations, etc. Toward this goal, the concrete wall specimens were exposed to heat following an ISO 834 standard time–temperature curve and the cyclic loading was applied to the fire-damaged walls. The test results showed that exposure to fire significantly reduced the cyclic performance of the RC walls. Especially, it was observed that heated area, designed failure mode, and aspect ratio have influences on maximum lateral loads, stiffness, and ductility of the fire-damaged walls, while almost no effects of the heated area, designed failure mode, and aspect ratio on temperature distribution and energy dissipation were found.
Highlights
Reinforced concrete (RC) wall is a common structural system in Korea, especially for residential buildings
This is because the RC wall has a relatively large fire exposure surface and the fire-damaged area can vary depending on the fire situation
5 Conclusions In our study, the effect of the heated area and design parameters on the cyclic behaviors of RC walls exposed to fire were investigated
Summary
Reinforced concrete (RC) wall is a common structural system in Korea, especially for residential buildings They have a demonstrated high capacity to resist shear forces as well as to prevent the spread of fire. The structural behavior of fire-damaged RC walls is somewhat different than other members such as beams and columns. This is because the RC wall has a relatively large fire exposure surface and the fire-damaged area can vary depending on the fire situation. Buchanan and Munukutla (1991) and Zheng and Zhuang (2011) used numerical methods to calculate the load-bearing capacity of fire-damaged RC walls based on boundary conditions, material nonlinearity, load levels, height-to-thickness ratios, material strength, reinforcement ratios, and cover thicknesses. Relatively few studies have been conducted on the cyclic performance of RC walls exposed to fire compared to studies about other structural members such as beams and columns (Bratina et al 2007; ElHawary et al 1996; Kodur and Bisby 2005; Kodur and Dwaikat 2008; Lim et al 2004; Pires et al 2012; Saafi 2002; Tan and Yao 2003; Tao et al 2008; Yuan et al 2010)
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