International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | March -2017
p-ISSN: 2395-0072
www.irjet.net
A review on Strengthening of RCC square columns with Reinforced Concrete Jacketing Tabish Rasool Sheikh1, Mohd Kashif Khan2, Tabish Izhar3 1 PG
Student, Structural Engineering, Integral University, Lucknow, Uttar Pradesh, India. Professor, Dept. of Civil Engg. Integral University, Lucknow, Uttar Pradesh, India. 3 Assistant Professor, Dept. of Civil Engg. Integral University, Lucknow, Uttar Pradesh, India. ---------------------------------------------------------------------***--------------------------------------------------------------------2 Associate
Abstract – In this Paper, the overall review about the
In case of Global Retrofitting, the entire structure is retrofitted which involves the overall analysis and design of the entire structure as per the specifications given in standard codes. Whereas, in case of Local Retrofitting, only a specific structural member is either strengthened or totally replaced. Jacketing technique is the most preferred method of retrofitting used both in practical and experimental purposes and can be applied by the following techniques including the traditional RC jacketing: 1. Wrapping the sheets of fiber reinforced polymers such as carbon fiber and glass fiber reinforced polymers. (CFRP) and (GFRP) 2. Classical Reinforced concrete jacketing. It can be done with or without Rebaring, depending upon the core size of column. 3. Confinement with Ferrocement. I.e. Wire mesh Mortar Jacketing.
change in strength and the ductility behavior of Reinforced concrete square columns is discussed when strengthened with classical reinforced concrete jacketing. Although on a large scale numerous laboratory studies on strengthening of columns by RC jacketing are conducted and then reported, but there is still an apparent need for finding and executing new ways to improve the performance of classical RC jacketing. As in the case of RC structure, columns are subjected to uniform and continuous loading which increases with the increase in no. of storeys and may lead to partially damage or even total failure of the column. In order to overcome the total failure of RC columns even before its service period is over an immediate attention is required in and the damaged part of reinforced concrete is repaired by classical reinforced concrete jacketing. This paper also focuses on the effect of providing dowel rebars by drilling holes, and the use of concrete jackets made with different types of concrete. And it was found that both using dowel rebars and different types of concrete increases the bond strength, overall load carrying capacity and first crack load.
In comparison to the above, strengthening with classical Reinforced concrete jacketing is the traditional and cost effective technique mostly used to retrofit or repair the damaged concrete structures even in earthquake-prone areas. In fact it has been recognized that from the past work classical RC jackets being economical do provide an increased strength, total stiffness, and overall enhancement of the structural performance. And, no doubt for this reason although classical RC jacketing exhibits few shortcomings, it is frequently used either prior to or even after the damage of RC structural member such as Column. Moreover, it is a wellknown fact that the success of the RC jacketing depends upon the good bond between the damaged column and the added jacket and this can be achieved first by increasing the roughness of the interface with hammer and chisel and then either by using a bonding agent such as epoxy or by installing shear connectors and dowel rebars.
Key Words: Reinforced Concrete column, Strengthening, Dowel rebar, Shear Connector and RC Jacketing
1. INTRODUCTION Columns are one of the most important structural member which transfers the entire loads to the foundation. The behavior of columns in tall structures is very important since column failures lead to additional structural failures and can result in total building collapse.Replacement of the damaged structural elements is very difficult and may create a high risk to the overall structural integrity. Generally, strengthening techniques for reinforced concrete structures can be divided into: addition of new structural elements or else strengthening of the existing structural elements. Thus, in order to strengthen the damaged part of RC column, retrofitting technique is the only solution to be used all over the world. Experimentally, Retrofitting can be done in two different ways, depends on the position and the extent of damage in structural member: Global Retrofitting Local Retrofitting
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2. LITERATURE REVIEW E S Ju´lio, F Branco and V D Silva _2003 [1] studied the structural rehabilitation of columns with reinforced concrete jacketing and concluded that the RC jacketing strengthening method, unlike other techniques, leads to a uniformly distributed increase in strength and stiffness of columns. Further, the durability of the original column is also improved, in contrast to the corrosion and fire protection needs of other techniques where steel is exposed or where
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