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PROCEEDINGS OF THE THIRTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping and Y. Tsompanakis
Seismic Assessment of Column Retrofitted with Steel Reinforced Polymers in Near Fault Earthquakes
Y. Yasrebi Nia1, M. Poorsharifi2 and Z. Poorsharifi2
1Civil Engineering Faculty, Islamic Azad University, Shabestar Branch, Iran
Y. Yasrebi Nia, M. Poorsharifi, Z. Poorsharifi, "Seismic Assessment of Column Retrofitted with Steel Reinforced Polymers in Near Fault Earthquakes", in B.H.V. Topping, Y. Tsompanakis, (Editors), "Proceedings of the Thirteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 174, 2011. doi:10.4203/ccp.96.174
Keywords: steel-reinforced polymer, fiber-reinforced polymer, reinforced concrete, near-field earthquake, finite element method, ductility.
Over the years, engineers have used different methods and techniques to retrofit existing structures by providing external confining stresses. For the past few years, the concept of jacketing has been investigated to provide such forces. Interest in the use of flexible fiber reinforced polymer (FRP) sheets for the external wrapping of concrete compressed members is today a very popular theme, especially with regard to estimating the effectiveness of this reinforcing technique in increasing the strength and ductility of members in seismic areas. Although FRP provides a very effective strengthening method, it has some drawbacks, such as high cost and brittleness. Steel reinforced polymers (SRP) were developed to solve these problems . In the current research the seismic performance of columns retrofitted with an SRP jacket and an FRP jacket is investigated through analytical analysis. A reinforced concrete column is developed with the ABAQUS finite element software. A plastic damage model was used in order to model the concrete's behavior. A fracture energy based constitutive model is used to simulate the reinforced concrete column's behavior under cyclic loading . After model verification with an experimental study , the column is retrofitted with an SRP jacket and an FRP jacket. Both FRP and SRP jackets were modeled as orthotropic materials . The model is subjected to near-field earthquake records. Three records were used in this study. The models were retrofitted with one, two and three layers of SRP and FRP separately. The effect of increasing the number of retrofitting layers on column's seismic behavior is investigated. Results indicate that increasing the number of retrofitting layers with both FRP and SRP jackets, leads to a higher ductility. Applying both an FRP jacket and an SRP jacket in near-field earthquakes causes an increase in the maximum base shear and an increase in the column displacement. Increasing the number of layers causes a considerable increase in the maximum base shear and a considerable increase in the column displacement.
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