International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 06 | June 2024
p-ISSN: 2395-0072
www.irjet.net
RETROFITTING OF STRUCTURE USING REINFORCED CONCRETE STEEL JACKETING Harshitha .S1, Jegidha K.J2 , Kathir vel3 , 1 PG student, Dept. of Civil Engineering, ADHIYAMAAN College of Engineering Hosur, India
2 Assistant professor, Dept. of Civil Engineering, ADHIYAMAAN College of Engineering Hosur, India 3 Assistant professor, Dept. of Civil Engineering, ADHIYAMAAN College of Engineering Hosur, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - This paper aims to review the strengthening
and pure bending loading. This study shows an increase in both strength and ductility of compression members with addition of these materials. Among all specimens, high loadcarrying capacity was increased by wire mesh and ductility was improved by FGFM.
techniques of Reinforced Concrete (RC) beams using steel jacket. The structural elements with poor strength and low bearing capacity are due to seismic activity, aging, temperature conditions, and attack of fire. To restore the strength as well as the age of the entire structure, retrofitting video wrapping or jacketing technique is used. Nowadays, retrofitting is widely used in the world. The present study focuses on the performance of galvanized-iron wire mesh(GI) in the rectangular reinforced column of the weaker section which delays the crack patterns and buckling effect as lifespan increases with the three incremental intervals of 25% for each of the four columns. Further, comparing the higher percentage mesh mesh-wrapped columns with the lower percentage wrapped ones.
Azam Amir et al. mentioned about the GI Wire Mesh earlier in 2013. This study deals with the combination of FRP and Wire Mesh applied at critical sections to stabilize the existing building columns of three no's with greater seismic resistance and strength. FRP sheets were used for horizontal wraps in the first strengthening scheme and wire mesh in the 2nd strengthening scheme. Among these, high strength was achieved by FRP sheet, and ductility was increased due to FRP and wire mesh. FRP jacketing can be adopted for strengthening purposes in further retrofitting projects.
Key Words: Retrofitting, Galvanized iron wire mesh, jacketing technique, strength.
Amrul Kaish et al (2013) researched improving square jacketing technique (SJT) to restore the strength of existing RC columns. Introducing two schemes in this study to reduce the concentration of stress and cracks at corners i.e., (i) all corners were to be strengthened and (ii) reducing corner stresses. A total eight numbers of square RC columns were loaded under concentric compressive loading until failure. Among eight numbers, six numbers are retrofitted ones and the remaining two are of control specimens. Three types of jacketing techniques were used such as (a) With the addition of wire mesh of a single layer, (b) With the addition of one layer of wire mesh and the corners of column are rounded, and (c) With the addition of single layer and two more extra layers at all corners of the column.
1. INTRODUCTION Column is the major element which carries compressive loads of the superstructure to the substructure. The failure of the column leads to destruction or performance is comparatively very low. Generally, failure occurs due to overloading, weaker cross-sectional area, dynamic loads, elastic instability, Seismic activity, fire, corroded steel, etc... To regain the strength of damaged/deficient columns can be rehabilitated by retrofitting technique. Jacketing is one of the most occurring and economical methods of retrofitting techniques in major projects. Steel Jacket, Reinforced Concrete Jacket, Fibre Reinforced and Polymer Composite are few types of Jacketing. The steel jacketing method consists of Galvanized Iron (GI) wire mesh that improves the ductility, compression strength, and good confinement to the column.
Bishnu Gupt et al (2014)conducted tests on nine columns with two types of retrofitting methods, they are wire mesh mortar jacketing (WMM) and steel cage mortar jacketing (SCM) of three specimens each are compared with plain reinforced columns (CS). Variations in results in comparison with WMM and SCM are 1.75 and 2.28 times greater than CS. WMM got the higher Stiffness value as compared to CS. According to strength consideration SCM is preferred and WMM in absorption consideration.
2. LITERATURE REVIEW Muhammad N. S. Hadi et al (2011) investigated various materials such as fiberglass wire mesh (FGFM), standard aluminum fly mesh (SAFM), and Galvanized steel wire mesh of 12.7*12.7mm size (S12.7 WM). Total sixteen numbers of circular columns were loaded under eccentric, concentric,
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Manikandeswaran et al (2015) have done experimental work on nine RC columns with two types of jacketing techniques; the Ferro cement technique and steel angles
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