A comparative study of retrofitting of beam column joint. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design. Pdf reinforced concrete jacketing interface influence on. Concrete is an artificial stone which is obtained after hardening the homogenous mixtures of cement, water, aggregates and sometime admixture andor additive to modify the fresh and hardened concrete. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and. Concrete basicsaddresses the needs of unskilled and semiskilled persons undertaking general concreting projects including home and handyman projects. Rehabilitation of reinforced concrete frame connections.
These may include water content, method and time of. Dec 10, 2009 this paper introduces a new steel jacketing method for reinforced concrete rc columns with lap splice and evaluates its performance by a series of axial tests of concrete cylinders. Jacketing is a type of retrofitting technique used for strengthening of buildings and structural elements. The jacketing of rc beams was done by using additional reinforcement and for connection between lateral and longitudinal. The earliest proposed strengthening techniques such as steel jacketing or concrete incasing enhanced the seismic performance of the. Following presents fig5 the technique of concrete jacketing being applied on the rc column. Concrete jacket construction detail effectiveness when. The method of epoxybonding steel plates and fiberglass reinforced plastics to the tensile face of reinforced concrete beams has been studied extensively as a method to strengthen existing reinforced concrete structures. It improves axial and shear strength of column and major strengthening of foundation may be avoided.
Repair and rehabilitation structural rehabilitation of. The application of externally bonded fiberreinforced polymer ebfrp as shear transverse reinforcement applied in vulnerable reinforced concrete rc beams has been proved to be a. Pdf retrofitting of existing rcc buildings by method of. Jacketing is a method which is commonly used for the repair of structural members. Reinforced concrete rc jacketing is most frequently used to strengthen columns. Jacketing has been considered as one of the important methods for strengthening and repairing of rc beams. The most common types of jackets are steel jacket, reinforced concrete jacket, fibre reinforced polymer composite jacket, jacket with high tension materials like carbon fibre, glass fibre etc. The plates can be tied to column using epoxy, anchor bolts or both of them. Retrofitting of existing rcc buildings by method of jacketing mlmce 1 civil engineering. Global retrofitting the retrofitting in which we use to repair. Concrete overlaying method manual among the individual methodology.
The load carried by the column is increased due to either increasing the number of floors or due to mistakes in the design. Strengthening reinforced concrete columns by jacketing using. The sizes of the sections are increased and the free. Dynamic behavior of reinforced concrete beam column joint. Rc beam with smooth surface jacketed using only microconcrete.
Strengthening of steel and concrete structures using cfrp. Building code requirements for structural concrete aci 31811 and commentary first printing august 2011 isbn 9780870317446 american concrete institute. Some recently developed materials and techniques can play vital role in. Different researchers have employed various methods of jacketing for reinforced concrete rc elements 15.
Concrete has a great variety of applications because it not only meets structural demands but also lends itself readily to architectural treatment. The overlaying and jacketing construction method is a retrofitting method in which concrete sections are added and corresponds to 2 overlaying construction method and 3 jacketing construction method in the figure. The common practice to prepare the interface is empirically based and consists on increasing the surface. In the planning phase, the cfrp sheet jacketing method was compared to concrete jacketing method and steel plates jacketing method. This paper introduces a new steel jacketing method for reinforced concrete rc columns with lap splice and evaluates its performance by.
Structures with polymer modified concrete suresh chandra pattanaik phd student, kiit university, bhubaneswar and team head advanced diagnostic laboratory, dr fixit institute of structural protection and rehabilitation, copidilite industries limited, mumbai. Repair and strengthening of reinforced concrete structures. Fig5 strengthening of the existing column by providing rebars around its periphery for. Strengthening and repair of reinforced concrete columns. Concrete basicsaims to provide a clear, concise explanation of all aspects of making quality concrete. Concrete is an artificial stone which is obtained after hardening the homogenous mixtures of cement, water, aggregates and sometime admixture andor additive to modify the fresh and. Sprayed concrete shotcrete it is one of the oldest materials and the most common techniques of repairing and strengthening of reinforced concrete structures sprayed concrete has been. Static analysis is carried out and load carrying capacity, loaddeflection behavior and failure pattern will be studied. There are two processes for applying sprayed concrete dry mix sprayed concretein which most of the mixing. Four full scale beams were first loaded to certain levels of ultimate capacity 0, 60%. Introduction jacketing is the most popularly used method for strengthening of building columns. Jacketing is one of the most frequently used techniques to strengthen reinforced concrete rc columns.
Introduction to repair and strengthening of reinforced concrete structures 1. The method of epoxybonding steel plates and fiberglass reinforced plastics. It is well known that the success of this procedure is dependent on the monolithic behavior of the composite element. Jacketing is one of the methods for strengthening of structural members. Strengthening reinforced concrete columns by jacketing. Three alternative methods of concrete jacketing are investigated and results are compared with. With this method, axial strength, bending strength, and stiffness of the original. Comparative analysis of existing rc columns jacketed with cfrp. Strengthening such elements is a method to increase the earthquake resistance. Strengthening existing reinforced concrete beams for. Reinforced jacketing, carbon fiber and reparation with steel plates are the ones that are used the most.
There are many different kinds of repairing and strengthening techniques in. The rc jacketing strengthening method, unlike other techniques, leads to a uniform distributed increase in the. Schematic view of steel plate jacketing of columns in connections is shown in figure 8. Rehabilitation of reinforced concrete frame connections using. The retrofitting is done by introducing additional stirrups and longitudinal bars to the existing building along with layer of concrete, to enhance the flexure and shear capacity. Astm c 1583, standard test method for tensile strength of concrete surfaces and the bond strength. On the other hand, externally bonded plate method, may be easier than jacketing method. Sprayed concrete shotcrete it is one of the oldest materials and the most common techniques of repairing and strengthening of reinforced concrete structures sprayed concrete has been used in that field for almost 90 years. Mechanical performance and applications ahmed elbadawy sayed, assoc.
Very few research works have been done on experimental behaviour of jacketed reinforced concrete. There are many different kinds of repairing and strengthening techniques in literature. Repairing and strengthening methods for rc structural. Fig5 strengthening of the existing column by providing rebars around its periphery for concreting. Its mostly used for columns whereas it can also be used for other members like. Measurements were taken from jacketing and strengthened columns.
Fixit micro concrete is supplied as a ready to use dry powder which requires only addition of clean water at site to produce a free flowing non shrink repair micro concrete. Global retrofitting the retrofitting in which we use to repair the whole structure is called global retrofitting. Jacketing consists of added concrete with longitudinal and transverse reinforcement around the existing column. There are different types of jacketing such as steel, reinforced concrete, fiber. Strengthening existing reinforced concrete beams for flexure. Research article materials and jacketing technique for. The sizes of the sections are increased and the free available usable space becomes less. Chapter 2 section enlargement and concrete jacketing. Retrofitting existing concrete elements by method of jacketing solutions horse construction business range tend to all over the world and service for thousands clients with products, technical,construction specialized guidance, and we witness the chinese reinfocing brands togther with them. It is recognized that the color of a concrete surface is affected by other factors in addition to the color of the cementitious material.
Pdf reinforced concrete jacketing interface influence. This is a cementitious material, with additives, which impart controlled expansion characteri stics in the plastic state while minimising water demand. Structures with polymer modified concrete suresh chandra pattanaik phd student, kiit university, bhubaneswar and team. Its mostly used for columns whereas it can also be used for other members like beam. Accordingly, we used here grout jacketing method to strengthening the columns. Pdf following previous studies, the authors describe an experimental study performed to analyze the. Nowadays, repairing and strengthening of damaged reinforcedconcrete buildings has become an important issue.
Apr 12, 2017 jacketing is a method which is commonly used for the repair of structural members. Strengthening of reinforced concrete rc beams is required due to design errors, deficient concrete production, bad execution processes, damage due to earthquake, accidents such as. Jacketing and collars for concrete column beam strengthening. The most common types of jackets are steel jacket, reinforced concrete jacket, fibre reinforced polymer composite. This paper introduces a new steel jacketing method for reinforced concrete rc columns with lap splice and evaluates its performance by a series of axial tests of concrete. Research article materials and jacketing technique. The effect of surface preparation and the mismatch of the moduli of the repair material and substrate were studied.
Reinforced concrete rc jacketing is a strengthening. A new steel jacketing method for rc columns magazine of. Jacketing is the most popularly used method for strengthening of building columns. The size of the jacket and the number and diameter of the steel bars used in the jacketing process depend on the structural analysis that was made to the column. Pdf reinforced concrete jacketing interface influence on cyclic. Retrofitting existing concrete elements by method of jacketing. There are different types of jacketing such as steel, reinforced concrete, fiber reinforced polymer composite, jackets with high tension materials like carbon fiber, glass fibre etc. Repair and strengthening of reinforced concrete beams honors. Introduction jacketing is the most popularly used method for strengthening of. This paper introduces a new steel jacketing method for reinforced concrete rc columns with lap splice and evaluates its performance by a series of axial tests of concrete cylinders.
In the following paragraphs, this method is assessed according to different aspects. Open access content subscribed content free content trial content. To investigate the effects of the strengthening techniques on the. In this study, the reinforced concrete jacketing method will be used. Retrofitting of reinforced concrete columns using ferrocement.
It is a popular seismic retrofit method that has been actively researched and applied in the past e. Arafa4 1professor of reinforced concrete, department of structure engineering, zagazig, egypt. Jacketing of beam it consist of added concrete with longitudinal and transverse reinforcement around the existing beam. There are several techniques which are used to strengthen reinforced concrete columns like reinforced concrete jacketing, steel jacketing, and frp confining or jacketing. Received april 27, 2009 accepted may 5, 2009 concrete jacketing is a commonly used method to retrofit or strengthen.
Concrete jacket construction detail effectiveness when strengthening rc columns. Strengthening of reinforced concrete rc beams is required due to design errors, deficient concrete production, bad execution processes, damage due to earthquake, accidents such as collisions, fire, explosions and situations involving changes in the functionality of the structure etc. In design process we must take two important points in considerations. Repairing and strengthening methods for rc structural members. Strengthening reinforced concrete columns by jacketing using selfcompacting concrete with different types of aggregates hamdy k. With this method, axial strength, bending strength, and stiffness of the original column are increased. Effect of steel plate jacketing of columns in seismic. Concrete jacketing, steel plate jacketing, glass fiber wrapping chinchu mohanan1, dr.
Jacketing and collars for strengthening of concrete structures jacketing is the process whereby a section of an existing structural member is restored to original dimensions or increased in size by encasement using suitable materials. In buildings, concrete is used for footings, foundations, columns, beams, girders, wall slabs, and roof unitsin short, all important building elements. The effect of concrete strength on the cfrp jacketing effectiveness was. Methods of strengthening concrete columns the constructor. Pdf reinforced concrete rc jacketing is most frequently used to strengthen columns. Jacketing fibre reinforced plastic reinforced concrete.
Effectiveness of various methods of jacketing for rc beams. Different researchers have employed various methods of jacketing for reinforced concrete rc. Strengthening of reinforced concrete structure elements using concrete jackets 3. The common practice to prepare the interface is empirically based and consists on increasing the surface roughness. Jacketing and collars for strengthening of concrete structures jacketing is the process whereby a section of an existing structural member is restored to original dimensions or increased in. This method is evaluated according to different characteristics and, in order to help structural engineers to choose the most appropriate solutions, recommendations are given, based on published experimental research and real case studies. Thus, the strength of the structures can be moderately or significantly increased and the. Introduction repairing of reinforced concrete elements is required after a damage. Mechanical performance and applications ahmed elbadawy sayed.
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