Displacement and plastic hinge length of FRP-confined circular reinforced concrete columns

Youssf, Osama; ElGawady, Mohamed A.; Mills, Julie E.

doi:10.1016/j.engstruct.2015.07.026

Cited by 73 publications

(11 citation statements)

References 41 publications

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“…Second, the Karagozian & Case (K&C) concrete model was adopted for modeling the concrete without consideration of strain rate effect. This material model was used by researchers to simulate the behavior of concrete under quasi-static loading with consideration of the confining effect under hydrostatic pressures [26,27]. Figure 13a illustrates the stress-strain relationship of the grout under uniaxial loading in the first and second test groups.…”

Section: Fem Modelsmentioning

confidence: 99%

Behavior of Grouted Sleeve Splice for Steel Profile under Tensile Loadings

Zhao

2020

Materials

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Two groups of grouted sleeve splices for steel profile were tested to investigate their tensile behavior, serving as pilot studies for novel prefabricated reinforced concrete shear wall structures. In the first group, four splice specimens with different embedded lengths of steel profile were monotonic tensile loaded to determine an appropriate anchorage length. In the second group, three splice specimens with a conservative anchorage length of steel profile were tested under repeated tensile loading, cyclic loading at high stress, and cyclic loading at large strain, respectively. Parametric studies were then conducted on sleeve thickness, grout strength, offset of steel profile, and misalignment of steel profile using finite element method (FEM)-based models. The results show that the splices in the second group behaved well with minor residential deformation and almost no pinching effect. The optimized sleeve thickness could be appropriately determined using FEM models. The compressive strengths of the grout exceeding a threshold value and the offset of steel profile had minor influence on splice behavior, while the misalignment of steel profile had a pronounced effect.

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Section: Fem Modelsmentioning

confidence: 99%

Behavior of Grouted Sleeve Splice for Steel Profile under Tensile Loadings

Zhao

2020

Materials

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“…The predication of the lateral load-deformation behaviour of a concrete column involves an important step, modelling the plastic hinge region (PHR) of the column (e.g. Inel and Ozmen 2006, Youssf et al 2015, Yuan et al 2017. The region is defined as the deformation and damage region of elements, which experience inelastic demands.…”

Section: Plastic Hinge Region (Phr) Heightmentioning

confidence: 99%

Behavior of Circular Fiber-Reinforced Polymer–Steel-Confined Concrete Columns Subjected to Reversed Cyclic Loads: Experimental Studies and Finite-Element Analysis

et al. 2019

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This paper studies experimentally the behaviour of circular FRP-steel confined concrete columns subjected to reversed cyclic loads. The influence of main structural factors on the cyclic behaviour of the columns is discussed. Test results show the outstanding seismic performance of FRP-steel confined reinforced concrete (RC) and steel-reinforced concrete (SRC) columns. The lateral confinement effectiveness of GFRP tube and GFRP-steel tube was verified and a simplified OpenSees-based finite element method (FEM) model was developed to simulate the experimental results of the test columns. Based on the proposed FEM model, a parametric analysis was conducted for investigating the effects of main factors on the reversed cyclic behaviour of GFRP-steel confined RC columns. Based on the test and numerical analyses, the study discussed the influence of variables such as the lateral confinement on the plastic hinge region (PHR) height and peak drift ratio of the columns under reversed cyclic loads. Results indicate that the lateral confinement significantly affects the PHR height of the circular confined RC columns. Based on the analyses of the data from this study and literature, a simple model was suggested to predict the peak drift ratio of the confined RC columns.

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“…The high porosity of mix and weak bonding between concrete and rubber content results in reduced concrete compressive strength due to addition or replacement of rubber [15,16]. A lot of researches have been conducted in recent years for fiber reinforced polymer (FRP) confinement of structures [17][18][19][20][21][22]. FRP jacketing of columns has become increasingly common in the construction industry.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Statistical Modeling of FRP Confined RuC Using Response Surface Methodology

2019

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Scrap tires that are dumped to landfill is a serious problem in China and rest of the world. The use of rubber in concrete is an effective environmental approach to reduce the amount of scrap tires around the world. However, the loss in compressive strength of concrete is a major drawback of rubberized concrete. In this paper, the fiber reinforced polymer (FRP) confinement technique is used to overcome the drawbacks of rubberized concrete (RuC). A total of sixty six RuC cylinders were tested in axial compression. The cylinders were cast using recycled rubber to replace, a) 0-50 percent fine aggregate volume, b) 0-50 percent coarse aggregate volume, and c) 40-50 percent fine and coarse aggregate volume. Twenty seven cylinders of the latter mix were then confined with one, two and three layers of CFRP jackets. Concrete suffered a substantial reduction in compressive strength up to 80 percent by fine and coarse aggregate replacement with rubber content. However, CFRP jackets recovered and further enhanced the axial compressive strength of RuC up to 600% over unconfined RuC. SEM was performed to investigate the microstructural properties of RuC. Statistical models were developed on the basis of experimental tests for FRP confined RuC cylinders using response surface method. The effect of variable factors; unconfined concrete strength, rubber replacement type and number of FRP layers on confined compressive concrete strength was investigated. The regression analysis was performed to develop the response equations based on quadratic models. The predicted and experimental test results were found in good agreement as the variation between experimental and predicted values were less than 5%. Furthermore, the difference between predicted and adjusted R2 was found to be less than 0.2 which shows the significance of the statistical models. These proposed statistical models can provide a better understanding to design the experiments and the parameters affecting FRP-confined RuC cylinders.

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Displacement and plastic hinge length of FRP-confined circular reinforced concrete columns

Cited by 73 publications

References 41 publications

Behavior of Grouted Sleeve Splice for Steel Profile under Tensile Loadings

Behavior of Grouted Sleeve Splice for Steel Profile under Tensile Loadings

Behavior of Circular Fiber-Reinforced Polymer–Steel-Confined Concrete Columns Subjected to Reversed Cyclic Loads: Experimental Studies and Finite-Element Analysis

Experimental Investigation and Statistical Modeling of FRP Confined RuC Using Response Surface Methodology

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