Behavior of large-scale FRP-confined rectangular RC columns under axial compression

Zeng, Jun-Jie; Lin, Guan; Teng, Jinguang; Li, L.J.

doi:10.1016/j.engstruct.2018.07.086

Cited by 156 publications

(48 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent experimental data collected by large-scale tests on FRP-confined rectangular RC columns [11] were used for the simulation of monotonic loading. Zeng et al [11] presented the test results of an experimental study consisting of nine large-scale rectangular RC columns with a cross-section of 435mm in depth and 290mm in width, including eight FRP-confined RC columns and one RC column without FRP jacketing as the control specimen, tested under axial compression. The experimental program examined the sectional corner radius and the FRP jacket thickness as the key test variables.…”

Section: Assessment Against Experimental Resultsmentioning

confidence: 99%

“…5 shows the correlation of the proposed material model with these experimental results and overall the numerical response can be characterized as satisfactory. It should be noted that for this comparison the iterative procedure was terminated for FRP rupture strain equal to 50% of that of the experimentally tested tensile FRP coupons [11]. A further evaluation of the model's performance under cyclic lateral loading which simulates earthquake loads and simultaneous constant axial compression was performed.…”

Section: Assessment Against Experimental Resultsmentioning

confidence: 99%

“…Correlation of the proposed material model with experimental results of large-scale CFRP-confined rectangular RC columns under axial compression[11].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Modeling of FRP-Confinement of Large-Scale Rectangular Rc Columns

Papavasileiou

Megalooikonomou²

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

View full text Add to dashboard Cite

One of the main applications of Fiber Reinforced Polymers (FRPs) in construction is in the confinement of reinforced concrete (RC) columns. The performance of FRP-confined concrete in circular columns has been extensively investigated and the efficiency of models available in literature is nowadays considered to be satisfactory. However, the case of FRP-confinement of rectangular RC sections is a more complex problem, the mechanism of which has not yet been adequately described. The aim of this work is to try and simplify the problem by proposing an iterative procedure based on the outcome of 3D FEM analysis run by the authors. An interesting outcome is that the so-called arching effect is never observed: indeed, the unconfined regions are partially confined and provide a certain contribution to the overall strength of the rectangular RC sections. Based on a system of "generalized springs", well-known stress-strain laws and a failure criterion, a simplified mechanical model that gives the stress-strain behaviour of a rectangular RC section confined by FRPs under concentric load is proposed. The algorithm takes into account all parameters available to designers, such as corner rounding radius, stiffness of the FRP and concrete strength, while it can be easily understood and implemented. Its results are found to correlate adequately to recent experimental data yielded by large-scale tests on FRP-confined rectangular RC columns. Finally, in order to further evaluate the performance of this material model, it was implemented in the simulation of a series of experimental tests of FRP-retrofitted square RC columns under cyclic lateral loading simulating earthquake loads and simultaneous constant axial compression, performed by Memon and Sheikh [1]. In particular, all specimens were simulated using nonlinear fiber elements, in which the FRP-confined concrete was modelled using the aforementioned material model. Comparison between the numerical and experimental hysteresis of the column is indicative of the effectiveness of the implemented modelling.

show abstract

Section: Assessment Against Experimental Resultsmentioning

confidence: 99%

Section: Assessment Against Experimental Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Modeling of FRP-Confinement of Large-Scale Rectangular Rc Columns

Papavasileiou

Megalooikonomou²

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

View full text Add to dashboard Cite

show abstract

“…The studies on FRP-confined RC columns under compressive axial loads revealed that the internal reinforcement bars contribute to the increase of their strength and ductility [42][43][44][45][46][47][48][49]. In the studies, the confinement pressure was the sum of the confinement provided by the FRP wraps and that of the internal hoops.…”

Section: Amount Of Frp For Sufficiently Confined Concretementioning

confidence: 99%

Axial Compression Model for FRP Confined Concrete in Elliptical Cross Sections

Z¹,

Isleem²

2018

Preprint

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

“…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%

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

Isleem

Wang

2018

J. Compos. Sci.

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

Behavior of large-scale FRP-confined rectangular RC columns under axial compression

Cited by 156 publications

References 50 publications

Modeling of FRP-Confinement of Large-Scale Rectangular Rc Columns

Modeling of FRP-Confinement of Large-Scale Rectangular Rc Columns

Axial Compression Model for FRP Confined Concrete in Elliptical Cross Sections

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

Contact Info

Product

Resources

About