Buckling behavior analysis of prestressed CFRP-reinforced steel columns via FEM and ANN

Hu, Lili; Feng, Peng; Meng, Yanran; Yang, Jian

doi:10.1016/j.engstruct.2021.112853

Cited by 34 publications

(18 citation statements)

References 30 publications

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“…The typical axial load-axial shortening curves of square steel tube columns and PCWST columns are shown in Figure 6(d) and (e). The typical curve of square steel tube columns could be approximately divided into four segments, namely elastic, post-buckling, failed and post-failed stages, as shown in Figure 6(d), which was consistent with existing literature (Hu et al, 2021;Karimian et al, 2017;Liu et al, 2021;Nassirnia et al, 2015;Teng et al, 2012). Whilst the typical curve of PCWST columns approximately had six segments, namely elastic, post-buckling, descending, secondary ascending, failed and post-failed stages, as shown in Figure 6(e).…”

Section: Axial Load-axial Shortening Responsessupporting

confidence: 89%

“…On account of continuous stiffening provided by corrugated steel plates, the use of thinner steel plates was permitted (Nassirnia et al, 2015). Besides, fiber reinforced polymer composites (FRP), which is characterized by superior corrosion resistance, excellent environment degradation properties and ease of handing, also has become an attractive alternative material in a wide range of strengthening and retrofitting steel structures (Abu-Sena et al, 2019; Hu et al, 2021; Karimian et al, 2017; MacEachern and Sadeghian, 2020; Teng et al, 2012). Generally, FRP sheets and strips are usually bonded externally to column surfaces, resulting in the outward buckling being effectively postponed or eliminated.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, FRP sheets and strips are usually bonded externally to column surfaces, resulting in the outward buckling being effectively postponed or eliminated. Nevertheless, significant degeneration in local buckling strength due to the inward buckling is inevitable, and the strengthening effect has an indivisible relation with the number, the fiber orientation and the adhesives property (Hu et al, 2021; Karimian et al, 2017). For CFRP composites, the galvanic corrosion may induce the durability performance degeneration of steel tubes.…”

Section: Introductionmentioning

confidence: 99%

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Development and axial behavior of precast concrete wrapped square steel tube columns

Huang

et al. 2022

Advances in Structural Engineering

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Conventional thin-walled square steel tube columns are vulnerable to local buckling, carbon steel is susceptible to corrosion, and complicated fireproof measures increase the maintenance expenditures. As a result, a novel composite component, namely precast concrete wrapped square steel tube (PCWST) column is developed in this study. Seven PCWST columns subjected to axial compression load were investigated experimentally with different width-to-thickness ratios, specimen sizes, types and configurations of shear connectors in comparison to three square steel tube columns. The distinctive behavior of PCWST columns and square steel tube columns included failure modes, axial load-axial shortening responses, stiffness, buckling respond, load-carrying capacity and ductility were compared. Based on experimental results, nonlinear finite element (FE) models with full detailing were established and validated. Meanwhile, a simplified formula for predicting the load-carrying capacity of PCWST columns was proposed. Tested and simulated results show that steel tube and reinforced concrete (RC) encasement worked together for PCWST columns, and the head studs and the developed kinked rebars can enhance their interaction. The existing of RC encasement dramatically improves stiffness and load-carrying capacity, and it also delays the occurrence of local buckling of steel tubes.

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Section: Axial Load-axial Shortening Responsessupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development and axial behavior of precast concrete wrapped square steel tube columns

Huang

et al. 2022

Advances in Structural Engineering

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“…Two groups of tests are designed, as shown in Table 3 and Figure 2. The prestress level is defined as the ratio of T i / A P to the CFRP strength f P , and its range is based on real applications (Hu et al, 2021a).…”

Section: Cfrp Controlled By Displacement Constraintsmentioning

confidence: 99%

“…The good short-term performances of CFRPs in the two loading conditions have been proved. For example, many studies show that prestressed CFRP can efficiently improve the bending/lateral buckling behavior (Ghafoori and Motavalli, 2015a, 2015b; Kianmofrad et al, 2017; Zhu et al, 2016) and fatigue behavior (Colombi et al, 2003; Täljsten et al, 2009; Thanasis and Deskovic, 1991; Vatandoost, 2010) of beams and the overall buckling of columns (Feng and Hu, 2019; Hu and Feng, 2021; Hu et al, 2021a, 2021b). However, CFRPs controlled by displacement constraints and force constraints have potential problems of prestress loss and permanent deformation caused by creep in a long term, respectively.…”

Section: Introductionmentioning

confidence: 99%

Long-term behavior of CFRP plates under sustained loads

Feng

2022

Advances in Structural Engineering

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This paper studies the long-term behavior of carbon fiber–reinforced polymer (CFRP) plates under sustained loads. Two typical loading conditions, CFRP plate loading controlled by displacement constraints and force constraints, are studied. The first section investigates the prestress loss of the CFRP plate when it is loaded via displacement constraints, which serves as a prestressed system applied for prestressed structures. Short- and long-term measurements show that the prestress loss of CFRP is caused by material creep, temperature change, and CFRP and anchorage slippage. When the CFRP prestress level is 5.0%–12.3%, the average prestress loss after 42 days is 5.1%. The second section investigates the permanent deformation of the CFRP plate with curved anchorages caused by creep under a certain sustained load (i.e., controlled by force constraints), which serves as a suspension bar or cable applied for determinate structures. The creep strain-to-time relationship, creep rate, and residual strength were obtained. The creep strain-to-time relationship strongly depends on the stress level applied; the creep coefficient is less than 10.94% and the residual strength is greater than 80% of the initial tensile strength after 1000 h. The findings show the effectiveness and reliability of these two typical cases of CFRP plates under long-term sustained loads.

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A novel machine learning framework informed by the fractional calculus dynamic model of hybrid glass/jute woven composite

Wang,

Petrů

2024

J of Applied Polymer Sci

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This study investigates the influence of glass‐jute fiber hybridization on the dynamic viscoelastic performance of woven natural fiber composites. Experiments elucidated the effects of low‐frequency vibration and glass/jute ratio on the storage modulus and loss factor. Results exhibited nonlinear escalations in storage modulus and loss factor with increasing frequency and glass fiber content. The loss factor also demonstrated nonlinear rises with frequency and jute content. A fractional calculus‐based two‐branch model successfully captured these behaviors by incorporating frequency and hybrid ratio as key variables, showing excellent agreement with measurements. To further improve predictive accuracy, an artificial neural network informed by the fractional calculus dynamic model is implemented by enforcing physical constraints during training. The physics‐informed artificial neural network achieved higher correlation to experiments than unconstrained models, affirming the value of fusing physics knowledge into data‐driven models. This study highlights the promise of physics‐guided machine learning for predicting the intricate dynamics of sustainable natural fiber hybrid composites. The integrated analytical and data‐driven techniques provide a pathway to comprehensively model the mechanical performance of advanced multiphase materials over diverse conditions.

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Buckling behavior analysis of prestressed CFRP-reinforced steel columns via FEM and ANN

Cited by 34 publications

References 30 publications

Development and axial behavior of precast concrete wrapped square steel tube columns

Development and axial behavior of precast concrete wrapped square steel tube columns

Long-term behavior of CFRP plates under sustained loads

A novel machine learning framework informed by the fractional calculus dynamic model of hybrid glass/jute woven composite

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