Browsing by Author "Srilal, HPS"

Now showing 1 - 4 of 4

item: Conference-Abstract
Behaviour of CFRP strengthened concrete slab at elevated temperature
(2016-05-11) Ranasinghe, RATM; Jinadasa, DVLR; Srilal, HPS; Gamage, JCPH
The use of Carbon Fiber Reinforced Polymers (CFRP) for concrete structures is becoming worldwide trend as an alternative to the use of conventional materials. Although there is an enormous structural potential to use the CFRP strengthened concrete in high rise building projects and industrial structures, majority of applications are limited only in bridges. The main reason is due to the lack of information related with the fire resistance of strengthened members. However, it is the prime importance to establish the adequacy of fire endurance and the structural integrity of the members prior to further implementing CFRP composite materials in buildings. Studies are carried out regarding the behavior of insulated and non-insulated CFRP/concrete members exposed to high temperature. Finite element analysis was used for the heat transfer analysis and simulations are done with the aid of commercially available software (ANSYS). This paper presents the thermal behavior of CFRP/concrete subjected to the transient heat condition and analysis on the bond performance under standard fire condition.
item: Conference-Full-text
Bond performance of CFRP strengthened concrete subjected to fire
(2011-12) Ranasinghe, RATM; Jinadasa, DVLR; Srilal, HPS; Gamage, JCPH; Ratnayake, N
CFRP (Carbon Fibre Reinforce Polymer) strengthening system has recently emerged as a practical alternative for the flexural strengthening of reinforced concrete structures because of its efficiency in terms of structural performances, costs, labour and time savings. While CFRP is widely used in bridge construction, it can also be taken advantage of for strengthening concrete members such as beams, columns and slabs. Even though structural engineers are interested in using CFRP for the strengthening work of concrete members in buildings, always hesitation occurs due to lack of knowledge of its fire performance. Therefore it is essential to assess and develop the needed information on fire resistance of CFRP strengthened concrete structural members. The epoxy adhesive used to create the bond is known to be very sensitive totemperature and its mechanical properties deteriorate rapidly with exposure toelevated temperature. The CFRP sheet or plate itself cannot provide sufficient insulation to the composite system. Therefore, application of a suitable insulation onto the CFRP sheet is important, especially in the application to buildings.In this study the behaviour of insulated CFRP/concrete members subjected to standard fire condition is explored. A finite element model, developed by using commercially available software ANSYS was used to simulate the thermal behaviour of the insulated composite structure.
item: Conference-Abstract
Bond performance of CFRP strengthened concrete subjected to fire
(2016-05-11) Rariasinghe, RATM; Jinadasa, DVLR; Srilal, HPS; Gamage, JCPH
CFRP (Carbon Fiber Reinforce Polymer) strengthening system has recently emerged us a practical alternative for the flexural strengthening of reinforced concrete structures because of its efficiency in terms of structural performances, costs, labor and time savings. While CFRP is widely used in bridge construction, it can also be taken advantage of for strengthening concrete members such as beams, columns and slabs. Even though structural engineers are interested in using CFRP for the strengthening work of concrete members in buildings, always hesitation occurs due to lack of knowledge of its fire performance. Therefore it is essential to assess and develop the needed information on fire resistance of CFRP strengthened concrete structural members. The epoxy adhesive used to create the bond is known to be very sensitive to temperature and its mechanical properties deteriorate rapidly with exposure to elevated temperature. The CFRP sheet or plate itself cannot provide sufficient insulation to the composite system. Therefore, application of a suitable insulationonto the CFRP sheet is important, especially in the application to buildings.ln this study the behaviour of insulated CFRP/concrete members subjected to standard fire condition is explored. A finite element model, developed by using commercially available software ANSYS was used to simulate the thermal behaviour of the insulated composite structure.
item: Conference-Full-text
Endurance of insulated CFRP strengthened concrete slab subjected to fire
(2013-12-06) Ranasinghe, RATM; Jinadasa, DVLR; Srilal, HPS; Gamage, JCPH
Carbon Fiber reinforced polymer (CFRP) composites are recently becoming an efficacious solution in rehabilitation and strengthening work for deteriorated reinforced concrete structures, because of their superior properties. It is important to maintain a sound interaction between CFRP and concrete for transferring stresses between concrete substrate and the CFRP sheet or plate. However, the epoxy adhesive used to create the bond is very sensitive to the temperature and mechanical properties deteriorate rapidly with exposure to the elevated temperature. The CFRP sheet or plate itself cannot provide sufficient insulation to the composite system. Therefore, application of a suitable insulation onto the CFRP sheet is important especially in the application of buildings. Initially, a numerical model was developed to determine the behaviour of an insulated CFRP strengthened concrete block. The model predicted results were well agreed with the test results. Then the model was further developed to understand the behaviour of a CFRP strengthened concrete slab subjected to fire. Parametric studies were carried out to determine the fire resistance levels of the composite slab with the conductivity and the thickness of insulation.