Size effect tests of stocky reinforced concrete columns confined by stirrups

Du, Mingyuan; Jin, Liu; Du, Xiuli; Li, Dong

doi:10.1002/suco.201600074

Cited by 24 publications

(6 citation statements)

References 29 publications

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“…For this reason, Braga et al [40] investigated the problem by evaluating cyclic compression tests on RC columns confined with stirrups or retrofitted with FRP jackets. In the axial compression test, the size effect of the column with circular and square cross-sections assumes a fundamental role in structural behavior, as investigated by Du et al [41].…”

Section: Cyclic Axial Compression Testmentioning

confidence: 99%

The Structural Diagnosis of Existing RC Buildings: The Role of Nondestructive Tests in the Case of Low Concrete Strength

2020

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In the structural safety assessment process of existing structures, knowledge of the mechanical properties of the materials is key. Different experimental activities carried out on materials extracted from existing reinforced concrete buildings show a high strength variability, especially concrete. In the past, the lack of standardized quality control for materials and workmanship caused nonuniform and homogeneous properties within the same structure. The most accurate and reliable experimental technique consists of performing direct tests on the materials, but these are considerably expensive and invasive. In this paper, alternative indirect methods that estimate material properties by correlating different physical measures were proved to reduce invasive inspections on existing buildings and infrastructures, especially in built heritage. A complete experimental activity concerning destructive and nondestructive tests was conducted on elements (four portions of a column and a beam portion) removed from an Italian school building built in 1940. Destructive and nondestructive methods were compared and appropriate correlation laws developed to predict the main mechanical properties of the studied material. Reliable correlations were identified considering the pull-out test, Sonic–Rebound (SonReb) combined method and ultrasonic pulse velocities (UPVs). The latter were mapped by tomography, which highlighted the compression properties of concrete in the different structural sections.

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Section: Cyclic Axial Compression Testmentioning

confidence: 99%

The Structural Diagnosis of Existing RC Buildings: The Role of Nondestructive Tests in the Case of Low Concrete Strength

2020

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“…This configuration adds both more ductility and more dissipation energy capacity under seismic lateral loads (Cai, Su, Tsavdaridis, & Degée, 2018). Recent investigations have focused on the influence of the ties in the structural behavior of Revista de la Construcción 2022, 21(3) 657-668; https://doi.org/10.7764/RDLC.21.3.657 www.revistadelaconstruccion.uc.cl isolated structural elements (Du, Jin, Du, & Li, 2017;Grgić, Radnić, Matešan, & Banović, 2017;Gribniak, Rimkus, Torres, & Jakstaite, 2017;Hong, Han, & Yi, 2006;Li, Sun, Zhao, Lu, & Yang, 2018;Salah-Eldin, Mohamed, & Benmokrane, 2019;Sun & Li, 2019;Tan et al, 2018) of reinforced concrete (RC), but not in ties for tie-columns and bond beams.…”

Section: Introductionmentioning

confidence: 99%

Axial compressive behavior of short tie-columns with strapping spiral ties

Mesa-Lavista

Álvarez-Pérez²,

Chávez-Gómez³

et al. 2022

rdlc

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Spiral ties with rectangular cross sections have been developed as a new technology in construction, reducing the workforce in the reinforcement production series, because the worker does not have to place the tie reinforcement for the columns on the construction site. In this paper, a new type of tie was evaluated in short tie-columns subjected to axial compression to be applied in confined masonry. A comparison was made in this paper among spiral ties, with circular and rectangular cross sections, and traditional closed ties. The main aim of this research is to prove that these rectangular cross-section spiral ties can be used in tie columns for confined masonry structures. Twenty-one specimens were tested to investigate their structural behavior. As a part of the results, maximum loads, strains, load-displacement curves, and stress-strain relationships, were obtained based on testing standards, for both specimens and component materials. In addition, the fracture energy in compression and the ductility index were assessed. These results demonstrate that spiral ties with rectangular cross sections have an efficient structural response compared to traditional and circular spiral ties.

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“…The majority of the existing experimental and analytical investigations have been carried out to examine the stress–strain response of rectangular concrete columns with or without internal steel reinforcement confined with FRP, subjected to monotonic axial loading. Most of them have examined the experimental behavior and the analytical modeling of small‐scale concrete columns 2–10 and others have been focused on large‐scale specimens 4,11–15 …”

Section: Introductionmentioning

confidence: 99%

Assessment of analytical stress and strain at peak and at ultimate conditions for fiber‐reinforcement polymer‐confined reinforced concrete columns of rectangular sections under axial cyclic loading

Fanaradelli

Rousakis²

2020

Structural Concrete

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Confinement with fiber‐reinforcement polymer (FRP) materials is a technique, which can increase adequately the axial strain ductility of concrete. Plain and reinforced concrete columns, with circular, square and rectangular cross sections, confined with FRP materials, subjected to monotonic or cyclic compressive load, have been extensively studied over the last 35 years. Also, a lot of predictive expressions for peak and ultimate axial strength and strain, suitable for the available concrete sections, have been proposed. However, it is proven that it is difficult to accurately model and predict the behavior of the noncircular confined concrete columns, especially in the presence of internal longitudinal and transverse steel reinforcement, which is the real case for the majority of existing reinforced concrete structures. The presented study gathers all the available test results on square and rectangular reinforced or plain concrete columns confined with FRP materials and other novel techniques, subjected only to cyclic axial loading. It also assesses the performance of four significant expressions published in literature for the prediction of column load and deformation, proposed for the peak and ultimate conditions.

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Size effect tests of stocky reinforced concrete columns confined by stirrups

Cited by 24 publications

References 29 publications

The Structural Diagnosis of Existing RC Buildings: The Role of Nondestructive Tests in the Case of Low Concrete Strength

The Structural Diagnosis of Existing RC Buildings: The Role of Nondestructive Tests in the Case of Low Concrete Strength

Axial compressive behavior of short tie-columns with strapping spiral ties

Assessment of analytical stress and strain at peak and at ultimate conditions for fiber‐reinforcement polymer‐confined reinforced concrete columns of rectangular sections under axial cyclic loading

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