Job Thomas
https://dyuthi.cusat.ac.in:443/xmlui/handle/purl/4536
2024-09-13T19:32:00ZConstruction waste management in India
https://dyuthi.cusat.ac.in:443/xmlui/handle/purl/4542
Construction waste management in India
Job, Thomas; Wilson, P M
The management of construction waste is important today. The scarcity in the availability of aggregate for the production of concrete is one of the important problems facing by the construction industry. Appropriate use of the construction waste is a solution to the fast degradation of virgin raw materials in the construction industry. This paper enlightens the importance of reduce, reuse and recycle (3R) concept for managing the construction waste in India
American Journal of Engineering Research (AJER),Volume-2 pp-06-09
2013-01-01T00:00:00ZFlexure-shear Analysis of Concrete Beam Reinforced with GFRP bars
https://dyuthi.cusat.ac.in:443/xmlui/handle/purl/4541
Flexure-shear Analysis of Concrete Beam Reinforced with GFRP bars
Job, Thomas; Ramadass, S
This paper gives the details of flexure-shear analysis of concrete beams reinforced with GFRP rebars. The influence of vertical reinforcement ratio, longitudinal reinforcement ratio and compressive strength of concrete on shear strength of GFRP reinforced concrete beam is studied. The critical value of shear span to depth ratio (a/d) at which the mode of failure changes from flexure to shear is studied. The fail-ure load of the beam is predicted for various values of a/d ratio. The prediction show that the longitudinally FRP reinforced concrete beams having no stirrups fail in shear for a/d ratio less than 9.0. It is expected that the predicted data is useful for structural engineers to design the FRP reinforced concrete members.
CICE 2010 - The 5th International Conference on FRP Composites in Civil EngineeringSeptember 27-29, 2010 Beijing, China
2011-01-01T00:00:00ZNonlinear Analysis of Shear Dominant Prestressed Concrete Beams using ANSYS
https://dyuthi.cusat.ac.in:443/xmlui/handle/purl/4540
Nonlinear Analysis of Shear Dominant Prestressed Concrete Beams using ANSYS
Job, Thomas; Ananth, Ramaswamy
This study reports the details of the finite element analysis of eleven shear critical partially prestressed
concrete T-beams having steel fibers over partial or full depth. Prestressed T-beams having a shear span to
depth ratio of 2.65 and 1.59 that failed in shear have been analyzed using the ‘ANSYS’ program. The
‘ANSYS’ model accounts for the nonlinearity, such as, bond-slip of longitudinal reinforcement, postcracking
tensile stiffness of the concrete, stress transfer across the cracked blocks of the concrete and load
sustenance through the bridging action of steel fibers at crack interface. The concrete is modeled using
‘SOLID65’- eight-node brick element, which is capable of simulating the cracking and crushing behavior
of brittle materials. The reinforcement such as deformed bars, prestressing wires and steel fibers have been
modeled discretely using ‘LINK8’ – 3D spar element. The slip between the reinforcement (rebars, fibers)
and the concrete has been modeled using a ‘COMBIN39’- nonlinear spring element connecting the nodes
of the ‘LINK8’ element representing the reinforcement and nodes of the ‘SOLID65’ elements representing
the concrete. The ‘ANSYS’ model correctly predicted the diagonal tension failure and shear compression
failure of prestressed concrete beams observed in the experiment. The capability of the model to capture the
critical crack regions, loads and deflections for various types of shear failures in prestressed concrete beam
has been illustrated.
International ANSYS Conference Proceedings
2006-01-01T00:00:00ZStrength and serviceability performance of beams reinforced with GFRP bars in flexure
https://dyuthi.cusat.ac.in:443/xmlui/handle/purl/4539
Strength and serviceability performance of beams reinforced with GFRP bars in flexure
Job, Thomas; Biswarup, Saikia; Phanindra, Kumar; Nanjunda Rao, K S; Ananth, Ramaswamy
Glass fiber reinforced polymer (GFRP) rebars have been identified as an alternate construction material for reinforcing concrete
during the last decade primarily due to its strength and durability related characteristics. These materials have strength higher than steel,
but exhibit linear stress–strain response up to failure. Furthermore, the modulus of elasticity of GFRP is significantly lower than that of
steel. This reduced stiffness often controls the design of the GFRP reinforced concrete elements. In the present investigation, GFRP reinforced
beams designed based on limit state principles have been examined to understand their strength and serviceability performance. A
block type rotation failure was observed for GFRP reinforced beams, while flexural failure was observed in geometrically similar control
beams reinforced with steel rebars. An analytical model has been proposed for strength assessment accounting for the failure pattern
observed for GFRP reinforced beams. The serviceability criteria for design of GFRP reinforced beams appear to be governed by maximum
crack width. An empirical model has been proposed for predicting the maximum width of the cracks. Deflection of these GFRP
rebar reinforced beams has been predicted using an earlier model available in the literature. The results predicted by the analytical model
compare well with the experimental data
Construction and Building Materials 21 (2007) 1709–1719
2006-09-20T00:00:00Z