A modified constitutive model for FRP confined concrete in circular sections and its implementation with OpenSees programming

Liu, Hui; He, Ming; Luan, Yu; Guo, Jiqing; Liu, Lu Lu

doi:10.1631/jzus.a1300185

Cited by 8 publications

(5 citation statements)

References 18 publications

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“…The OpenSees platform comes with a complete secondary development interface for user-defined material based on the C++ language. The inherent UniaxialMaterial model in the OpenSees abstract category was selected for the proposed modified model of FRP-confined concrete [39]. Moreover, the envelope curves of compression and tension are constructed by the C_envelope and T_envelope functions, respectively.…”

Section: Opensees Program Realization Of the Modified Modelmentioning

confidence: 99%

Variability Analysis of the Hysteretic Behavior of Fiber-Reinforced Polymer (FRP)-Confined Concrete Columns Based on a Secondary Development Model

Wang,

Pan,

Niu

et al. 2023

Buildings

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A reasonable material hysteretic constitutive model has a significant influence on the seismic simulation results of structures. To better describe the hysteresis seismic performance of fiber-reinforced polymer (FRP)-constrained concrete, a new modified hysteresis constitutive model is proposed based on the existing model and with sufficient consideration of the drop section of the skeleton curve. The validity of the proposed model is verified by comparing with quasi-static experimental data of FRP-confined reinforced concrete (FRP-C RC) columns in the literature. Subsequently, the compressive strength of concrete is selected as a major variable, and a quasi-Monte Carlo method is utilized to generate random samples, which are substituted into the proposed modified model and some comparison models. Finally, the hysteretic behavior of FRP-C RC columns is analyzed from the perspective of the material strength variability. The results demonstrate that (1) The proposed hysteretic constitutive model is able to provide rational predictions of the hysteretic behavior of FRP-C RC columns, and the mean relative error of each specimen is less than 6%. It can be applied to carbon FRPs (CFRPs) and glass FRPs (GFRPs), as well as different cross-sectional forms such as cylindrical and square columns. (2) A large number of hysteretic behavior cases of FRP-C RC columns can be successfully analyzed from the perspective of concrete material variability combined with finite element software. The average and variation coefficient of the maximum horizontal force of FRP-C reinforced C30 concrete columns are 76.77 kN and 0.0488, respectively, while the average and variation coefficient of the maximum horizontal force of FRP-C reinforced C50 concrete columns are 91.14 kN and 0.0454, respectively. (3) The average value and variation coefficient of the maximum horizontal force and equivalent damping ratio of FRP-C RC columns are affected by the compressive strength, axial compression ratio and reinforcement ratio, which show a certain regularity.

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Section: Opensees Program Realization Of the Modified Modelmentioning

confidence: 99%

Variability Analysis of the Hysteretic Behavior of Fiber-Reinforced Polymer (FRP)-Confined Concrete Columns Based on a Secondary Development Model

Wang,

Pan,

Niu

et al. 2023

Buildings

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“…OpenSees system was adopted in the analysis of the FRP-RC beams under both static and cyclic loading because the OpenSees system contains static and cyclic analysis features with both load and displacement control schemes. 13 Diagram of the fiber section 14 of FRP-RC concrete beams based on OpenSees is shown in Figure 9. The ''NonlinearBeamColumn'' element was adopted in the analysis based on the ''Fiber Section'' model of OpenSees software.…”

Section: Analysis Based On the Opensees Softwarementioning

confidence: 99%

Flexural performance of U-shape fiber-reinforced polymers profile-concrete composite beams under static and cyclic loads

Zhang

Zhu²,

Wu³

et al. 2016

Journal of Reinforced Plastics and Composites

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This paper mainly focuses on flexural behavior of U-shape HFRP profile-concrete composite beams under static and cyclic loading. Four-point-bending experiments of eight pieces of HFRP-RC composite T-shaped beams with shear keys combined with wet-bond interface under both static and cyclic loads were conducted. The fiber-reinforced polymers profiles were produced by using vacuum infusion molding process. Experiment phenomena were detailed, and flexural performance such as failure mode, capacity, stiffness and load–displacement curves was also analyzed. Result shows that the shear keys combined with wet-bond interface is effective. Meanwhile, the flexural performance of the fiber-reinforced polymers-reinforced concrete beams under cyclic load was simulated based on the OpenSees software, in which special constitutive models of different materials were chosen to consider the cyclic loading. The simulation results and the experimental results such as the load–displacement curves, unloading stiffness, residual displacements, etc. were compared. The results show that OpenSees system can simulate the flexural performance of the fiber-reinforced polymers-reinforced concrete beams under both monotonic loads and cyclic loads very well. And then parameters study was conducted by using simulation method, and the influence factors such as concrete strength, steel bar ratio, fiber-reinforced polymers types, tensile stiffness of the longitudinal fiber-reinforced polymers, etc. were analyzed. Meanwhile, the recoverability of the fiber-reinforced polymers-reinforced concrete composite beams was evaluated, and a modified formula for the residual deformation was put forward. Finally, an idealized type of fiber-reinforced polymers-reinforced concrete beams with a medium reinforcement ratio and high post-yield stiffness was proposed, and reasonable values of the secondary stiffness ratio (defined as post-yield tangent stiffness divided by post-crack tangent stiffness) are recommended.

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“…Here the short-term exponential stress-strain constitutive model proposed by Liu et al (2013) for FRP-confined concrete core is used to calculate the axial strain in concrete ε c1 (t 0 ) with initial σ c1 (t 0 ). The hoop strain in FRP laminates ε f3 (t 0 ) = ε c3 (t 0 ) = μ c ε c1 (t 0 ) and its corresponding hoop stress σ f3 (t 0 ) = μ c ε c1 (t 0 )E f can be obtained, where E f is the elastic modulus of FRP.…”

Section: Interaction Of Wrapped Frp and Concretementioning

confidence: 99%

“…As mentioned above, the FRP-confined concrete model proposed by Liu et al (2013) was adopted in determining the short-term stress-strain relationship here. It is a modified model based on the prevalent Lam-Teng's model (Lam and Teng, 2003), and the envelope curve can be expressed as a combination of a parabola first branch and a linear second branch as shown in Fig.…”

Section: Stress-strain Envelopementioning

confidence: 99%

Design-oriented modeling of circular FRP-wrapped concrete columns after sustained axial compression

Liu

Guo

et al. 2015

J. Zhejiang Univ. Sci. A

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Fiber-reinforced plastic-wrapped concrete columns (FRP-C) have been extensively used in building structures and transportation infrastructures around the world during the past two decades. These members are actually subjected to a long-term sustained axial compression before they experience the designated ultimate loading. However, little attention has been given to the performance of FRP-C after sustained axial compression compared with that of its short-term instant performance. This study aims to establish a design-oriented numerical model for the long-term deformation of circular FRP-C after sustained load. A modified constitutive model of FRP-wrapped concrete is proposed for numerical analysis of FRP-C considering two dominant effects of sustained axially compressive loading. Numerical verifications against existing tests indicates that the ultimate strength will be slightly enhanced while the ultimate strain will be conspicuously reduced in most cases of normal strength FRP-C after a long-term sustained load.

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A modified constitutive model for FRP confined concrete in circular sections and its implementation with OpenSees programming

Cited by 8 publications

References 18 publications

Variability Analysis of the Hysteretic Behavior of Fiber-Reinforced Polymer (FRP)-Confined Concrete Columns Based on a Secondary Development Model

Variability Analysis of the Hysteretic Behavior of Fiber-Reinforced Polymer (FRP)-Confined Concrete Columns Based on a Secondary Development Model

Flexural performance of U-shape fiber-reinforced polymers profile-concrete composite beams under static and cyclic loads

Design-oriented modeling of circular FRP-wrapped concrete columns after sustained axial compression

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