Axial stress–strain model developed for rectangular RC columns confined with FRP wraps and anchors

Isleem, Haytham F.; Tahir, Muhammad Faheem Mohd; Wang, Zhenyu

doi:10.1016/j.istruc.2019.12.020

Cited by 26 publications

(14 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This means the f cc is greater than f c , and, as a result, the confined specimen experienced enhancement in axial strength and ultimately exhibited an ascending stress-strain response. In contrast, when the MC R is less than 0.02, a second post-peak softening component occurs in the stress-strain response, as reported in several tests conducted on large-scale columns lightly confined with CFRP in some of the recent studies, e.g., [16][17][18][20][21][22].…”

Section: Amount Of Frp For Sufficiently Confined Concretementioning

confidence: 99%

“…Tests on FRP-confined RC columns under compressive axial loads revealed that the internal reinforcement bars contribute to the increase of their strength and ductility [16][17][18][20][21][22]42,[44][45][46][47][48][49][50]. In most cases, the lateral confining pressure was derived from the confinement provided by the FRP wraps and the internal steel hoops.…”

Section: Amount Of Frp For Sufficiently Confined Concretementioning

confidence: 99%

“…It was concluded that the FRP jackets are not able to effectively improve the compressive behavior of square and rectangular columns exhibiting softening behavior. Recently, it has been confirmed by Isleem et al [16][17][18][20][21][22] for rectangular columns of larger-sized cross-sections that the confinement provided by the FRP wraps resulted in a significant improvement in axial strains but only a small improvement in axial strengths. In their study, the results of tests showed that only the sufficiently confined specimens with an aspect ratio of 1.5 reached higher strengths than that of the unconfined concrete cylinder, while no strength enhancement was achieved for larger-sized specimens with an aspect ratio of 2.0.…”

Section: Introductionmentioning

confidence: 97%

“…Over the last 25 years, a large number of experimental tests and analytical models were focused on the axial compressive behavior of FRP-confined concrete, e.g., . The majority of the existing studies have focused on modeling the stress-strain behavior of FRP-confined concrete in circular cross-sections under axial compression, while only limited studies have considered FRP-confined concrete in rectangular cross-sections [11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Axial Compressive Stress-Strain Model Developed for FRP-Confined Concrete Columns with Elliptical Cross Sections

Isleem

Wang

2018

J. Compos. Sci.

Self Cite

View full text Add to dashboard Cite

Most existing studies conducted on fiber-reinforced polymer (FRP)-confined concrete have considered circular and square concrete columns, while limited studies have considered columns with rectangular sections. Studies have confirmed that the circular cross-sections exhibited higher confinement effectiveness, whereas in the case of non-circular cross-sections the efficiency of FRP confinement decreases with an increase of the sectional aspect ratio and there is no significant increase, particularly for columns with the aspect ratio of 2.0. As recently suggested by researchers, to significantly increase the effectiveness of FRP-confinement for these columns involves changing a rectangular section into an elliptical or oval section. According to the literature, most of the existing confinement models for FRP-confined concrete under axial compression have been proposed for columns with circular and rectangular cross-sections. However, modeling of the axial strength and strain of concrete confined with FRP in elliptical cross-sections under compression is limited. Therefore, this paper provides new expressions based on limited experimental data available in the literature. For a sufficient amount of FRP-confinement, the threshold value was proposed to be 0.02. Finally, the accuracy of the proposed model was verified by comparing its predictions with the same test database, together with those from the existing models.

show abstract

Section: Amount Of Frp For Sufficiently Confined Concretementioning

confidence: 99%

Section: Amount Of Frp For Sufficiently Confined Concretementioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Axial Compressive Stress-Strain Model Developed for FRP-Confined Concrete Columns with Elliptical Cross Sections

Isleem

Wang

2018

J. Compos. Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…. The majority of the existing studies have focused on modeling the stress-strain behavior of FRP-confined concrete in circular cross-sections under axial compression, while only limited studies considered FRP-confined concrete in rectangular cross-sections [11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Axial Compression Model for FRP Confined Concrete in Elliptical Cross Sections

Z¹,

Isleem²

2018

Preprint

Self Cite

View full text Add to dashboard Cite

Most of the existing studies conducted on FRP-confined concrete considered circular and square concrete columns, while limited studies were on columns with rectangular sections. The studies have confirmed that the circular cross-sections exhibited higher confinement effectiveness, whereas in the case of non-circular cross-sections the efficiency of FRP confinement decreases with an increase of the sectional aspect ratio and there is no significant increase, particularly for columns with the aspect ratio of 2.0. As recently suggested by the researchers, to significantly increase the effectiveness of FRP-confinement for these columns is by modifying a rectangular section to an elliptical or oval section. According to the literature, most of the existing confinement models for FRP-confined concrete under axial compression have been proposed for columns with circular and rectangular cross-sections. However, modeling the axial strength and strain of concrete confined with FRP in elliptical cross-sections under compression is most limited. Therefore, this paper provides new expressions based on limited experimental data available in the literature. For a sufficient amount of FRP-confinement, the threshold value was proposed to be 0.02. Finally, the accuracy of the proposed model was verified by comparing its predictions with the same test database, together with those from the existing models.

show abstract

Effectiveness of FRP confinement for low strength recycled aggregate concrete compressive members having optimized combination of fibers

Raza,

Elhag,

Ouni

et al. 2023

Structural Concrete

View full text Add to dashboard Cite

The quantity of recycled concrete aggregates is increasing day by day due to the enhanced demolition rate of old infrastructures, which is dangerous to the environment's sustainability. Therefore, it is essential to handle these recycled aggregates for sustainable development. Furthermore, due to the low compressive strength (COS) of recycled aggregate concrete (RAC), it has always remained an active research area to ameliorate the mechanical performance of such concrete by either adding fibers and/or laterally confining with carbon fiber reinforced polymer (carbon‐FRP) wraps. The main objective of the current investigation is to improve the strength of hybrid fiber‐reinforced recycled aggregate concrete (HFRAC) transversely wrapped with carbon‐FRP wraps. The axial COS, axial strain, and compressive stress–strain graphs of the tested samples were assessed by manufacturing a total sum of 18 cylindrical samples wrapped with either one or two carbon‐FRP wraps. Two different grades of HFRAC were fabricated that is, 15 and 20 MPa containing hybrid fibers (steel and polypropylene fibers). The results showed that the transverse wrapping effectively ameliorated the axial strain, COS, and axial stiffness of HFRAC samples. By using a single layer of carbon‐FRP wraps, an enhancement of 115.7% was observed while using two layers of carbon‐FRP wraps, an enhancement of 130.7% was observed in the COS of 15 MPa group HFRAC samples. Similarly, by using a single layer of carbon‐FRP wraps, an enhancement of 37.4% occurred while using two layers of carbon‐FRP wraps, an enhancement of 112.6% occurred in the COS of 20 MPa group HFRAC samples. Hence, the lateral wrapping of low‐strength HFRAC is more efficient than the high‐strength HFRAC. A theoretical investigation based on the analysis of 11 different models was also performed to predict the COS of carbon‐FRP‐wrapped HFRAC samples.

show abstract

Axial stress–strain model developed for rectangular RC columns confined with FRP wraps and anchors

Cited by 26 publications

References 25 publications

Axial Compressive Stress-Strain Model Developed for FRP-Confined Concrete Columns with Elliptical Cross Sections

Axial Compressive Stress-Strain Model Developed for FRP-Confined Concrete Columns with Elliptical Cross Sections

Axial Compression Model for FRP Confined Concrete in Elliptical Cross Sections

Effectiveness of FRP confinement for low strength recycled aggregate concrete compressive members having optimized combination of fibers

Contact Info

Product

Resources

About