International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 09 Issue: 07 | July 2022
p-ISSN: 2395-0072
www.irjet.net
Strengthening of flexural and shear deficient RCC beam with nano composite jacketing Fathimath Sahdiya S A1, Rajeena K K2 1PG
student ,Dept. of Civil Engineering ,KMEA College of Engineering, Kerala, India Professor, Dept. of Civil Engineering ,KMEA College of Engineering, Kerala , India ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract - Retrofitting of structures has become an 2. OBJECTIVES 2
inevitable in the construction activity. It is necessary to improve the load carrying capacity of damaged structural members and it could be achieved by strengthening externally, through a jacketing technique. For the case of beam, various types of solutions were introduced as a part of strengthening the deformed structure. One of the main solutions to strengthen the deformed beam is by providing ferrocement jacketing. In order to strengthen and improve the performance of the deformed beams, it is need to find out the best method of providing jacketing. For that, here conduct analysis by change in length of jacketing. Then findout the parameters like ultimate deflection, ultimate load and ductility of the beam.. The main objective of the study is to compare different models and identify the best method of providing jacketing which enhance both ultimate loads carrying capacity and ductility of the beam.
• To create models of different structurally deficient beams with jacketing at different length. • To analyse and compare the parametric effect like ultimate deflection, ultimate load and ductility improvement of nano composite strengthened beam.
3. METHODOLGY The study's major goal is to improve the strength and performance of deformed beams in terms of ductility and ultimate load carrying capacity. For the beam specimen, surface of the beam were cleaned and roughened. The beam were wrapped with square and expanded wire mesh. A 10 mm thick cement mortar was applied to the surface of the beam. For that 3% of nanosilica could be used as a flowable nano SiO2 based mortar. A 10 mm flowable nano SiO2 based mortar was applied to the surface of beam. The ferrocemnt retrofitted beam specimens were left for curing. Then, the beam specimens are tested for two point load in a loading frame. Complete analysis is performed using the ANSYS WORKBENCH software.
Key Words: ANSYS, Ferrocement , Two point load, Nano SiO2 based mortar, Retrofit
1. INTRODUCTION Ferrocement Jacketing is preferred as one of the acceptable and viable way for strengthening of structural members. As per ACI committee, Ferrocement is a thin construction element with thickness in the order of 10–25 mm, which comprises of rich cement mortar and steel wire mesh as the main reinforcing material for confinement of the structural elements. For ferrocement mortar, 3% nano silica based cementitious matrices are used for jacketing.
4. NUMERICAL STUDY 4.1 Modelling of beam The beam with rectangular cross section was selected . From references the selected beams had a cross section (width and thickness) of 150 × 300 mm and were 2.0 m length . One bottom layer of two 12 mm Grade 550 MPa reinforcing bars was used for the tension reinforcement of all RC beams. A top layer of two 8 mm Grade 550 MPa reinforcing bars was used as hangers of the 10 mm closed stirrups. The stirrups were placed and spaced at 100 mm along the beam’s span to avoid the possibility of shear failure.
The structural element like beam is mainly undergo flexural and shear deformation. In order to improve the strength of structural deficient beam , here select a flexural and shear deficient beam. And provide jacketing at different length at bottom of the structurally deformed beam. Two point loading is provided on different beams with simple supports at both ends. The analysis of the beams conducted using ANSYS software, such that the parameters like total deformation , load carrying capacity, ductility of different beams are studied and compare to find out the best method of jacketing to improve the strength of deformed beam.
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In order to make FD+SD ( flexural and shear deficient )beam the diameter reinforcement in the tensile zone is reduces to 10mm and number of stirrups provided throughout the length of the beam is reduces. Here models of this FD+SD beam, and other deficient beam with jacketing at different length like 500mm, 1000mm, 1500mm,2000mm of the beam
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