STUDY OF BEHAVIOR AND VALUE OF STEEL-FIBER-REINFORCED CONCRETE COLUMNS SUBJECTED TO CYCLIC LOADING
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Abstract
Building damage or impacts due to large earthquakes in Thailand has resulted in the requirement of earthquake-resistant design for new buildings, especially in high earthquake-prone regions. The current building regulation has also extended more areas considered earthquake-prone zones. However, most of the new buildings or houses in high-risk areas, which are not regulated, do not adopt the seismic design standard due to an increase of project cost. Hence, partial reinforcement of structures with an emphasis on low cost is another option to prevent or mitigate damage from earthquakes. This research aims to study strengthening methods for reinforced concrete columns using steel fibers and additional stirrups, and to compare both in terms of structural performance and cost. Three columns were tested under lateral cyclic loads to determine the efficiencies of steel fibers and additional stirrups by an enhancement in column ductility. Besides, a one-story reinforced concrete building was selected as a sample for a cost analysis and value evaluation of two different strengthening techniques. Value was considered from a ratio of a percentage increase in ductility to a percentage increase in cost. The study has found that strengthening columns with steel fibers and additional stirrups improved the ductility by 103 and 33 percent, respectively, and increased the total cost of the columns by 2.56 and 0.57 percent, respectively, which were the values of 40 and 58, respectively.
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The published articles are copyright of the Engineering Journal of Research and Development, The Engineering Institute of Thailand Under H.M. The King's Patronage (EIT).
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