www.semargroup.org, www.ijsetr.com ISSN 2319-8885 Vol.03,Issue.08, May-2014, Pages:1357-1364 Copyright @ 2014 SEMAR GROUPS TECHNICAL SOCIETY. All rights reserved. Retrofitting of High Rise RC Building using CFRP to Resist Earthquake Effect THEINT THEINT THU SOE 1 , SAN YU KHAING 2 1 PG Scholar, Dept of Civil Engineering, Mandalay Technological University, Mandalay, Myanmar, E-mail: [email protected]. 2 Assoc Prof, Dept of Civil Engineering, Mandalay Technological University, Mandalay, Myanmar, E-mail:[email protected]. Abstract: Moderate and severe earthquakes have struck different places in the world by causing severe damage to reinforced concrete structures. Upgradation to higher seismic zones of several cities and towns in the country has also necessitated in evolving new retrofitting strategies. Retrofitting of existing structures are the major challenges that modern civil engineering field is facing these days. In this paper, twelve storey reinforced concrete building is proposed in seismic zone 2B (case A) originally. Superstructure of high-rise building is designed with ACI 318.99 by using ETABS (Extended Three Dimensional analysis of building) software as a structural tool. Required seismic load data is considered base on UBC 1997 code. When the structure is considered prone to higher seismic risk and is analyzed in seismic zone 3 (case B), some members in the structure can become seismically deficient. So, these members must be strengthened in order to satisfy the condition given in zone3. Strengthening of deficient beams and columns are made by the use of ‘‘Sika Curbodur Composite Strengthening Systems of FRP Analysis Software’’ to increase flexural, shear and confinement strength of reinforced concrete structures based on FIB, Bulletin No.14. Design and analysis obtained from ETABS software are used as input data in FRP software. In this study, FRP design is made only critical beams and columns for upgrading of the building for lateral loads. Keywords: Moderate and Severe Earthquake, Retrofitting, Sika Carbodure Software. I. INTRODUCTION Among the natural hazards, earthquakes have the potential for causing the greatest damages to structures. Beams and columns, being the lateral and vertical load resisting members in RC structure are particularly vulnerable to failures during earthquakes and hence their retrofit is often the key to successful seismic retrofit strategy. Seismic retrofitting is an effective method of reducing the risks for existing seismically deficient structures. Basic methodology of strengthening mechanisms can be classified into two fundamental approaches. They are local modification of structural components and global modification of the structural systems. Global modification, also termed as structural-level retrofit includes addition of new structural wall, steel braces, base isolators etc. However, member- level retrofit local modification is a much more cost effective method than the earlier one since it involves selecting and strengthening only the weak and deficient components of the whole structure. It includes addition of steel jackets, FRP materials etc for the confinement of column and flexural and shear strengthening of beams. Though bonding with steel plate is proved to be successful to some extent, steel as a strengthening material has some certain limitations. Among these are low corrosion resistance, difficulty in handling at construction site because of its excessive size and weight and lack of durability. These problems associated with using steel plates as a retrofit method have led to invent new rehabilitation and strengthening techniques. Among these techniques fiber-reinforced polymer (FRP) composites as retrofit materials has gained much notable success in recent years. This paper focuses on the recent progresses in retrofitting of RC columns and beams using various FRP retrofitting schemes with a view to improve the seismic performance of the deteriorated structure. [8] A fiber reinforced polymer system consists of fibers typically made of carbon, glass, or aramid and a polymer adhesive that can be an epoxy, polyester, or vinyl-ester. An effective FRP system is one where the fibers and adhesive are working together so that the fibers can take on a portion of the load from the original structure through an adhesive bond. FRP materials are lightweight, non- corrosive, non-magnetic and exhibit high tensile strength. Therefore, FRP composites were selected to be used in retrofitting of the building. [5] II. FRP REINFORCEMENT SYSTEMS It's possible to choose between several systems of reinforcement that differ for the type of fiber, for the resins and also for the application techniques. The fibers used in civil engineering are carbon fibers (CFRP), glass fibers (GFRP) and aramid fibers (AFRP). The systems available are Wet Lay-Up Systems (cured in-situ), Pre-cured Systems (prefabricated) in a way. The installation procedure for Wet Lay-Up Systems (cured in-situ) and Pre-cured Systems (prefabricated) in a way.
Retrofitting of High Rise RC Building using CFRP to Resist Earthquake Effect
May 07, 2023
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