Explainable extreme gradient boosting tree-based prediction of load-carrying capacity of FRP-RC columns

A centrally reinforced column is a new type of RC columns, formed by providing a reinforcement skeleton at the central part of the cross section of an ordinary RC column. Tests have shown that as compared with an ordinary RC column, this type of columns has a higher load carrying capacity and ductility. From the pushover analysis of a frame composed of ordinary RC columns and one consisting of centrally reinforced columns, their seismic performance under seismic load of 9-degree intensity was studied according to Chinese code, including target displacements, story-level displacements, interstory drifts, appearance and development of plastic hinges. The results indicate that although the dimensions of cross sections of columns in the frame with centrally reinforced columns are smaller than those of the ordinary frame, the former still has a higher overall load carrying capacity and seismic performance than the latter.

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Experimental study on the axial compression performance of GFRP-reinforced concrete square columns

Advances in Structural Engineering ◽

10.1177/1369433218817988 ◽

2018 ◽

Vol 22 (7) ◽

pp. 1554-1565 ◽

Cited By ~ 1

Author(s):

Jianwei Tu ◽

Kui Gao ◽

Lang He ◽

Xinping Li

Keyword(s):

Carrying Capacity ◽

Ultimate Load ◽

Fiber Reinforced Polymer ◽

Load Carrying Capacity ◽

Longitudinal Reinforcement ◽

Rc Columns ◽

Compression Performance ◽

Reinforced Polymer ◽

Load Carrying ◽

Ultimate Load Carrying Capacity

At present, extensive studies have been conducted relative to the topic of fiber-reinforced polymer(FRP)- reinforced concrete (RC) flexural members, and many design methods have also been introduced. There have, however, been few studies conducted on the topic of FRP-RC compression members. In light of this, eight glass-fiber-reinforced polymer (GFRP)-RC square columns (200×200×600 mm) were tested in order to investigate their axial compression performance. These columns were reinforced with GFRP longitudinal reinforcement and confined GFRP stirrup. These experiments investigated the effects of the longitudinal reinforcement ratio, stirrup configuration (spirals versus hoops) and spacing on the load-carrying capacity and failure modes of GFRP-RC rectangular columns. The test results indicate that the load-carrying capacity of longitudinal GFRP bars accounted for 3%-7% of the ultimate load-carrying capacity of the columns. The ultimate load-carrying capacity of RC columns confined with GFRP spirals increased by 0.8%-1.6% with higher ductility, compared to GFRP hoops. Reducing the stirrup spacing may prevent the buckling failure of the longitudinal bars and increase the ductility and load-carrying capacity of the GFRP-RC columns. It has been found that setting the GFRP compressive strength to 35% of the GFRP maximum tensile strength yields a reasonable estimate of ultimate load-carrying capacity of GFRP-RC columns.

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Load-Carrying Capacity of Short Concrete Columns Reinforced with Glass Fiber Reinforced Polymer Bars Under Concentric Axial Load

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.b2372.129219 ◽

2019 ◽

Vol 9 (2) ◽

pp. 1712-1719

Keyword(s):

Carrying Capacity ◽

Load Capacity ◽

Plain Concrete ◽

Concrete Columns ◽

Reinforcement Ratio ◽

Load Carrying Capacity ◽

Rc Columns ◽

Gfrp Bars ◽

Glass Fiber Reinforced ◽

Load Carrying

In this paper, 1 group of plain concrete square columns 150×150×600 mm and 11 groups of concrete columns reinforced with glass fiber reinforced polymer (GFRP) were cast and tested, each group contains of 3 specimens. These experiments investigated effect of the main reinforcement ratio, stirrup spacing and contribution of longitudinal GFRP bars on the load carrying capacity of GFRP reinforced concrete (RC) columns. Based on the experiment results, the relationship between load-capacity and reinforcement ratio and the plot of contribution of longitudinal GFRP bars to load-capacity versus the reinforcement ratio were built and analyzed. By increasing the reinforcement ratio from 0.36% to 3.24%, the average ultimate strain in columns at maximum load increases from 2.64% to 75.6% and the load-carrying capacity of GFRP RC columns increases from 3.4% to 25.7% in comparison with the average values of plain concrete columns. Within the investigated range of reinforcement ratio, the longitudinal GFRP bars contributed about 0.72%-6.71% of the ultimate load-carrying capacity of the GFRP RC columns. Meanwhile, with the same configuration of reinforcement, contribution of GFRP bars to load-carrying capacity of GFRP RC columns decreases when increasing the concrete strength. The influence of tie spacing on load-carrying capacity of reinforced columns was also taken into consideration. Additionally, experimental results allow us to propose some modifications on the existing formulas to determine the bearing capacity of the GFRP RC column according to the compressive strength of concrete and GFRP bars.

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Evaluation of the Load Carrying Capacity of Short RC Columns Strengthened with a Novel Cementitious Material by Using FEA

Advanced Engineering Forum ◽

10.4028/www.scientific.net/aef.8-9.343 ◽

2013 ◽

Vol 8-9 ◽

pp. 343-352

Author(s):

Ionut Ovidiu Toma ◽

Daniel Covatariu ◽

Irina Lungu ◽

Mihai Budescu

Keyword(s):

Finite Element ◽

Carrying Capacity ◽

Civil Engineering ◽

Cementitious Material ◽

Material Behavior ◽

Load Carrying Capacity ◽

Dead Weight ◽

Element Analysis ◽

Rc Columns ◽

Load Carrying

Numerical simulations based on the Finite Element Method (FEM) have become an important tool in studying various phenomena of interest to both researchers and practitioners alike. The recent advances in computational power coupled with accurate mathematical models have made FEM an indispensable tool for investigating complex loading states and material behavior that are frequently met in civil engineering. Strengthening of existing RC columns is becoming a pressing issue in the field of civil engineering due to the necessity of meeting new safety requirements for the buildings located in active seismic areas. Jacketing is a widely used method for strengthening of reinforced concrete columns showing good results in terms of increased strength and stiffness but with the addition of some unwanted effects amongst which the added dead weight is of primary importance in case of an earthquake. The paper presents the results obtained by means of Finite Element Analysis (FEA) on the load carrying capacity of short RC columns strengthened with a novel Cementitious material that may be the solution to lighter structures and lower added costs compared to other existing methods.

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Evaluating Method of Deformation at Losing Point of Axial Load Carrying Capacity of RC Columns

Journal of Asian Architecture and Building Engineering ◽

10.3130/jaabe.8.501 ◽

2009 ◽

Vol 8 (2) ◽

pp. 501-508 ◽

Cited By ~ 4

Author(s):

Daisuke Kato ◽

Yudai Miyajima ◽

Yukiko Nakamura

Keyword(s):

Carrying Capacity ◽

Axial Load ◽

Load Carrying Capacity ◽

Rc Columns ◽

Load Carrying ◽

Evaluating Method

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Structural Behavior of RC Column Confined by FRP Sheet under Uniaxial and Biaxial Load

Polymers ◽

10.3390/polym14010075 ◽

2021 ◽

Vol 14 (1) ◽

pp. 75

Author(s):

Huynh-Xuan Tin ◽

Ngo-Thanh Thuy ◽

Soo-Yeon Seo

Keyword(s):

Carrying Capacity ◽

Biaxial Loading ◽

Compressive Load ◽

Load Carrying Capacity ◽

Reinforced Concrete Column ◽

Eccentric Load ◽

Rc Columns ◽

Rc Column ◽

Load Carrying ◽

Frp Sheet

Various researches have been performed to find an effective confining method using FRP sheet in order to improve the structural capacity of reinforced concrete column. However, most of these researches were undertaken for the columns subjected to concentric compressive load or fully confined RC columns. To date, it remains hard to find studies on partially FRP-confined RC columns under eccentric load. In this manner, an experimental investigation was carried out to assess the performance of rectangular RC column with different patterns of CFRP-wrap subject to eccentric loads in this paper. The experiment consists of fourteen mid-scale rectangular RC columns of 200 mm × 200 mm × 800 mm, including five controlled columns and nine CFRP-strengthened ones. All CFRP-strengthened columns were reinforced with one layer of vertical CFRP sheet with the main fiber along the axial axis at four sides, then divided into three groups according to confinement purpose, namely unconfined, partially CFRP-confined, and fully CFRP-confined group. Two loading conditions, namely uniaxially and biaxially eccentric loads, are considered as one of the test parameters. From the test of uniaxial eccentric load, partial and full CFRP-wraps provided 19% and 33% increased load-carrying capacity at an eccentricity-to-column thickness ratio (e/h) of 0.125, respectively, compared to controlled columns, and 8% and 11% at e/h = 0.25, respectively. For the partially CFRP-confined columns subjected to biaxial eccentric load with e/h = 0.125 and 0.25, the load-carrying capacities were improved by 19% and 31%, respectively. This means that the partial confinement with CFRP effectively improves the load-carrying capacity at larger biaxial eccentric load. It was found that the load-carrying capacity could be properly predicted by using code equations of ACI 440.2R-17 and Fib Bulletin 14 Guideline for the full CFRP-confined or partially CFRP-confined columns under uniaxial load. For partially CFRP-confined columns under biaxial loading, however, the safety factors using the Fib calculation process were 20% to 31% lower than that of uniaxially loaded columns.

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