International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 05 | May 2023
p-ISSN: 2395-0072
www.irjet.net
Behavior of Partially Strengthened RC Columns from Sides of the Perimeter Using Prefabricated Hybrid Composite Plates (HCP) Anjusha M. P1, Krishna M. M2 1 PG Student, APJ Abdul Kalam Technological University, Kerala
Universal Engineering College, Vallivattom, Kerala, India
2 Assistant professor APJ Abdul Kalam Technological University, Kerala, India
Universal Engineering College, Vallivattom, Kerala, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - A This study is to investigate the efficiency of partial strengthening of reinforced concrete columns using
prefabricated hybrid composite plates (HCP) from sides of perimeter. It involves the use of ANSYS software to analyse the effect of different strategies of strength and durability on corner and edge rectangular columns that fully strengthening can’t be executed. So effectiveness of partial strengthening studied by strengthen from one, two, three sides as edge columns have only three available sides and corner columns from one and two sides because of two sides availability. The composite plates were made up of different materials, including CFRP (Carbon fibre reinforced polymer) and SHCC (Strain hardening cementitious composites), the most suitable materials for strengthening of the columns. Chemical anchors were used to prevent or delay debonding of strengthening layer and these bolts used for attaching 25 mm plates to columns. The columns are then subjected to axial loading conditions and their response is analysed in terms of load-carrying capacity, stiffness and ductility. The optimal strengthening configuration is identifying by changing column sides and span conditions, changing HCP NSM (Near surface mounted) method CFRP embedded configurations. This paper contributes to the development of efficient and effective partial strengthening techniques by use of HCP on RC columns, particularly in terms of enhancing their strength and resisting external forces. Among these particular span condition and number of strengthening sides identified that provide high load carrying capacity than others. Key Words: Partial Strengthening, ANSYS, HCP, Axial Loading, NSM, SHCC, CFRP, Chemical Anchors
1.INTRODUCTION Columns are the vertical structural member designed to support loads primarily in compression and transmit them to the foundation or the base. It is one of the most fundamental elements of a building's structural system. These are the primary loadbearing structural components in the building which makes them most likely vulnerable to deterioration. Over time, it requires strengthening to resist earthquake, increased loads, changing facility types of services or increased traffic volume in bridges, to add or restore ultimate load capacity. Structure types and loading schemes affect strengthening method. Collapse of reinforced concrete (RC) structures because of Increased Load Capacity, Deterioration, Structural Deficiencies, Seismic Upgrades, Change of use has become frequent so column strengthening is necessary to ensure the safety, durability, and longevity of RCC structures. Structural elements may need to be repaired or strengthened due to chemical and physical actions. For the past few years several techniques implemented used to strengthen reinforced concrete columns like reinforced concrete jacketing, steel jacketing, and FRP confining or jacketing.[1] For some cases fully strengthening can’t be executed so have to investigate the feasibility of partial strengthening on rectangular corner and edge columns to explore the possibility of achieving adequate strength and stiffness, which involves selectively reinforcing specific areas of the columns. Hybrid composite plates strengthening is an innovative technique used in structural engineering to enhance the performance of existing concrete structures. It involves the combination of two materials. The main combinations can be taken are SHCC (strain hardening cementitious composites) and CFRP (carbon fibre reinforced polymer) [2]. The application of prefabricated hybrid composite plates strengthening is particularly useful in strengthening existing concrete structures. These prefabricated plates of 25 mm thickness can be fixed to the existing column throughout the specimen by bolted connections. These chemical anchors were used to prevent or delay debonding of the strengthening layer. By adding the hybrid composite plates to the structure, the load-carrying capacity of the structure can be increased without the need for major structural modifications. This makes the technique a cost-effective solution for extending the lifespan of aging infrastructure. It offering a promising solution for improving the performance of concrete structures in a durable and sustainable manner. Columns are the vertical structural member designed to support loads primarily in compression and transmit them to the foundation or the base. It is one of the most fundamental elements of a building's structural system. These are the primary load-
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