... [16], Roller and Russel [17], Ahmad and Lue [18], Barrington[19], Shin et al. [20], Kim and W... more ... [16], Roller and Russel [17], Ahmad and Lue [18], Barrington[19], Shin et al. [20], Kim and White [21], Tompos and Frosh [22], Ahmad et al. [23], Reineck et al. [24], and many more. Despite the extensive research work, shear behavior of high-strength reinforced concrete beams ...
Mehran University Research Journal of Engineering and Technology, 2013
The experience shows that fire-damaged concrete structures both technically and economically can ... more The experience shows that fire-damaged concrete structures both technically and economically can be reinstated after fire due to high fire resistance and high residual strength. The residual strength of fire-damaged concrete structural member depends on the peak temperature reached during fire, fire duration and the distribution of temperature within the structural member. The assessment of the residual strength of post-heated concrete structural members in a professional way is a prime factor to take a decision about the reinstatement or demolition of fire-damaged structure. This paper provides an easy and efficient approach to predict the residual strength of reinforced concrete columns based on the estimated temperature which may have occurred within the concrete cross-section during a fire. A finite element model was developed to evaluate the distribution of temperature within the cross-section of the reinforced concrete columns. Twelve reinforced concrete square columns were he...
This paper describes an experimental study that evaluates the effectiveness of carbon fiber reinf... more This paper describes an experimental study that evaluates the effectiveness of carbon fiber reinforced polymer (CFRP) confinement on the axial compressive strength of plain and reinforced concrete square columns. For this purpose eight concrete square columns were experimented under axial compression load. The tested specimens were divided into two groups. The first group contained four plain concrete square columns while the second group comprised four reinforced concrete square columns. In each group two columns were tested as control specimens without CFRP wrapping and the remaining two columns of each group were tested after wrapping with a single layer of CFRP jacketing. The results of the CFRP wrapped specimens for each group were compared with their control un-wrapped specimens in terms of gain in axial load strength. The results showed that the CFRP confinement is more effective for enhancing the axial load carrying capacity of the un-reinforced concrete square columns compa...
This paper presents the results of the experimental study for the un-heated and fire damaged rein... more This paper presents the results of the experimental study for the un-heated and fire damaged reinforced concrete square columns confined with a single layer of Carbon Fiber Reinforced Polymer (CFRP) jacket. A total of four un-heated reinforced concrete square columns, two unconfined control specimens and two CFRP confined square columns were tested under axial compression. The experimental data of the four fire damaged reinforced concrete square columns, two unconfined fire damaged control specimens and two CFRP confined fire damaged square columns tested under axial compression were selected from the already published research study. The results of the experimental tested data of un-heated reinforced concrete square columns were compared with the published data of the fire damaged reinforced concrete square columns in terms of confined compressive strength and the gain in axial load bearing capacity. The results showed that a single layer of CFRP jacket is more effective for enhanc...
The paper deals with the application of fiber reinforced polymer (FRP) laminates or fabrics as sh... more The paper deals with the application of fiber reinforced polymer (FRP) laminates or fabrics as shear strengthening materials for reinforced concrete beams. The study aims at increasing the experimental database on shear strengthening of concrete using composites and, most importantly, developing an analytical model for the design of such members within the framework of modern code formats, based on ultimate limit states. The experimental part of the study involved testing of eleven concrete beams, strengthened in shear with carbon FRP at various area fractions and fiber configurations, while the analytical part resulted in a model for the contribution of FRP to shear capacity in analogy with steel stirrups, with an effective FRP strain that decreases with increasing FRP axial rigidity. It is shown that the effectiveness of the technique increases almost linearly with the FRP axial rigidity and reaches a maximum, beyond which it varies very little.
... [16], Roller and Russel [17], Ahmad and Lue [18], Barrington[19], Shin et al. [20], Kim and W... more ... [16], Roller and Russel [17], Ahmad and Lue [18], Barrington[19], Shin et al. [20], Kim and White [21], Tompos and Frosh [22], Ahmad et al. [23], Reineck et al. [24], and many more. Despite the extensive research work, shear behavior of high-strength reinforced concrete beams ...
... [16], Roller and Russel [17], Ahmad and Lue [18], Barrington[19], Shin et al. [20], Kim and W... more ... [16], Roller and Russel [17], Ahmad and Lue [18], Barrington[19], Shin et al. [20], Kim and White [21], Tompos and Frosh [22], Ahmad et al. [23], Reineck et al. [24], and many more. Despite the extensive research work, shear behavior of high-strength reinforced concrete beams ...
Mehran University Research Journal of Engineering and Technology, 2013
The experience shows that fire-damaged concrete structures both technically and economically can ... more The experience shows that fire-damaged concrete structures both technically and economically can be reinstated after fire due to high fire resistance and high residual strength. The residual strength of fire-damaged concrete structural member depends on the peak temperature reached during fire, fire duration and the distribution of temperature within the structural member. The assessment of the residual strength of post-heated concrete structural members in a professional way is a prime factor to take a decision about the reinstatement or demolition of fire-damaged structure. This paper provides an easy and efficient approach to predict the residual strength of reinforced concrete columns based on the estimated temperature which may have occurred within the concrete cross-section during a fire. A finite element model was developed to evaluate the distribution of temperature within the cross-section of the reinforced concrete columns. Twelve reinforced concrete square columns were he...
This paper describes an experimental study that evaluates the effectiveness of carbon fiber reinf... more This paper describes an experimental study that evaluates the effectiveness of carbon fiber reinforced polymer (CFRP) confinement on the axial compressive strength of plain and reinforced concrete square columns. For this purpose eight concrete square columns were experimented under axial compression load. The tested specimens were divided into two groups. The first group contained four plain concrete square columns while the second group comprised four reinforced concrete square columns. In each group two columns were tested as control specimens without CFRP wrapping and the remaining two columns of each group were tested after wrapping with a single layer of CFRP jacketing. The results of the CFRP wrapped specimens for each group were compared with their control un-wrapped specimens in terms of gain in axial load strength. The results showed that the CFRP confinement is more effective for enhancing the axial load carrying capacity of the un-reinforced concrete square columns compa...
This paper presents the results of the experimental study for the un-heated and fire damaged rein... more This paper presents the results of the experimental study for the un-heated and fire damaged reinforced concrete square columns confined with a single layer of Carbon Fiber Reinforced Polymer (CFRP) jacket. A total of four un-heated reinforced concrete square columns, two unconfined control specimens and two CFRP confined square columns were tested under axial compression. The experimental data of the four fire damaged reinforced concrete square columns, two unconfined fire damaged control specimens and two CFRP confined fire damaged square columns tested under axial compression were selected from the already published research study. The results of the experimental tested data of un-heated reinforced concrete square columns were compared with the published data of the fire damaged reinforced concrete square columns in terms of confined compressive strength and the gain in axial load bearing capacity. The results showed that a single layer of CFRP jacket is more effective for enhanc...
The paper deals with the application of fiber reinforced polymer (FRP) laminates or fabrics as sh... more The paper deals with the application of fiber reinforced polymer (FRP) laminates or fabrics as shear strengthening materials for reinforced concrete beams. The study aims at increasing the experimental database on shear strengthening of concrete using composites and, most importantly, developing an analytical model for the design of such members within the framework of modern code formats, based on ultimate limit states. The experimental part of the study involved testing of eleven concrete beams, strengthened in shear with carbon FRP at various area fractions and fiber configurations, while the analytical part resulted in a model for the contribution of FRP to shear capacity in analogy with steel stirrups, with an effective FRP strain that decreases with increasing FRP axial rigidity. It is shown that the effectiveness of the technique increases almost linearly with the FRP axial rigidity and reaches a maximum, beyond which it varies very little.
... [16], Roller and Russel [17], Ahmad and Lue [18], Barrington[19], Shin et al. [20], Kim and W... more ... [16], Roller and Russel [17], Ahmad and Lue [18], Barrington[19], Shin et al. [20], Kim and White [21], Tompos and Frosh [22], Ahmad et al. [23], Reineck et al. [24], and many more. Despite the extensive research work, shear behavior of high-strength reinforced concrete beams ...
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