Axial Compressive Strength Models of Eccentrically-Loaded Rectangular Reinforced Concrete Columns Confined with FRP

Abstract

The majority of experimental and analytical studies on fiber-reinforced polymer (FRP) confined concrete has largely concentrated on plain (unreinforced) small-scale concrete columns, on which the efficiency of strengthening is much higher compared with large-scale columns. Although reinforced concrete (RC) columns subjected to combined axial compression and flexural loads (i.e., eccentric compression) are the most common structural elements used in practice, research on eccentrically-loaded FRP-confined rectangular RC columns has been much more limited. More specifically, the limited research has generally been concerned with small-scale RC columns, and hence, the proposed eccentric-loading stress-strain models were mainly based on the existing concentric-loading models of FRP-confined concrete columns of small scale. In the light of such demand to date, this paper is aimed at developing a mathematical model to better predict the strength of FRP-confined rectangular RC columns. The strain distribution of FRP around the circumference of the rectangular sections was investigated to propose equations for the actual rupture strain of FRP wrapped in the horizontal and vertical directions. The model was accomplished using 230 results of 155 tested specimens compiled from 19 studies available in the technical literature. The test database covers an unconfined concrete strength ranging between 9.9 and 73.1 MPa, and section’s dimension ranging from 100–300 mm and 125–435 mm for the short and long sides, respectively. Other test parameters, such as aspect ratio, corner radius, internal hoop steel reinforcement, FRP wrapping layout, and number of FRP wraps were all considered in the model. The performance of the model shows a very good correlation with the test results.

Finite element, analytical, artificial neural network models for carbon fibre reinforced polymer confined concrete filled steel columns with elliptical cross sections

“…Solution for the above problem is to pour the concrete in confining jackets, which control the exposure of concrete to an aggressive environment. Numerous studies have investigated concrete columns enclosed by different materials (Guo et al, 2009;Isleem et al, 2021) . These jackets are Poly Vinyl Chloride (PVC), Fiber Reinforced Polymer (FRP), steel tubes, and different fibers, among others.…”

Reliable machine learning for the shear strength of beams strengthened using externally bonded FRP jackets

“…Several design guidelines and codes exist worldwide (fib Task group 5.1, 2019; ACI Committee 440, 2017; Construction C-AC on TR for. CNR-DT 200 R1/2013, 2013TR-55 CSTR, 2012;JSCE Japanese Society of Civil Engineers, 2000;Abuodeh et al, 2020;Ly et al, 2020;Chalioris et al, 2020;Benzeguir and Chaallal, 2021;Kim, 2021;Isleem et al, 2021). The lack of consensus is due to the following reasons:…”

Predicting the Lateral Load Carrying Capacity of Reinforced Concrete Rectangular Columns: Gene Expression Programming

“…Columns are the primary structural elements intended to transfer the load of the overlying structure to the foundations underneath through axial compression [ 1 ]. Based on the material, they can be classified into several types.…”

“…However, the determination of shear capacity is relatively complicated because of multiple influencing factors and complex shear transfer mechanisms. Many experimental and finite element studies have predicted both these capacities of RC columns with higher accuracy [ 1 , 11 , 14 ], but these traditional capacity determination techniques are costly, time-consuming, and laborious. The solution to the problem lies in the development of analytical models [ 13 , 15 , 16 , 17 , 18 , 19 , 20 ].…”