The Quasi-Ductile Resistance of Compressed Spun Concrete Beam‐columns

Kliukas, Romualdas; Kudzys, Antanas; Vadlūga, Romualdas

doi:10.3846/jcem.2010.20

Cited by 8 publications

(8 citation statements)

References 7 publications

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“…The circular concrete-filled steel tubular (CFST) columns are characteristic of ductility, strength and a wide range of possibilities enabling incorporation of advanced materials and techniques, like spun concrete, thus making them the go-to solution when the traditional design fails. Centrifugal casting enables decreasing porosity of the concrete, increasing its homogeneity and strength, while minimizing self-weight by forming an annular cross section (Kliukas, Kudzys, & Vadlūga, 2010). The study has shown (Kvedaras & Sapalas, 1999) that, in case of a conventional multistorey building, in a non-seismic area, a mixed framework with hollow core CFST columns could reduce usage of steel and concrete by half in comparison to a regular reinforced concrete frame.…”

Section: Introductionmentioning

confidence: 93%

Experimental study of CFST column to steel beam bolted connection with curved end-plates

Mudrov

Šapalas

Šaučiuvėnas

2019

Modern Building Materials, Structures and Techniques (MBMST)

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This paper presents results of experimental study of a bolted column-beam connection with an extended curved end-plate joining steel beam and a hollow core Concrete-Filled Steel Tube (CFST). Column concrete hollow core was formed by centrifugal casting process that allowed decreasing porosity, increasing homogeneity and strength of the concrete. It was expected that strength and stiffness of the joint would be significantly affected by spalling of the concrete core due to transverse action, which would limit rotation of the joint and bearing capacity of the column. However, the concrete hollow core had no prominent signs of fracture -bending strength of the joint was determined by punching shear of the steel tube wall. Further result analysis has shown that, in reference to Eurocode 3, the joint may be classified as semi-rigid and that non-uniform initial contact between the end-plates and the column can reduce stiffness of the joint. In addition to this, it has been found that the analytical Eurocode component method is in close agreement with the attained test results, but its feasibility should be validated against additional tests with other failure modes.

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Section: Introductionmentioning

confidence: 93%

Experimental study of CFST column to steel beam bolted connection with curved end-plates

Mudrov

Šapalas

Šaučiuvėnas

2019

Modern Building Materials, Structures and Techniques (MBMST)

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“…The subject of shear forces associated with ductility was studied by Jensen and Lapko (2009). Kliukas et al (2010) reported a study on ring beam-columns under bending and compressive forces. They found that high strength reinforcement steel led to higher ductility when compared with normal strength reinforcement steel.…”

Section: Overview and Significance Of Researchmentioning

confidence: 99%

High-Strength Concrete Hollow Beams Strengthened With External Transversal Steel Reinforcement Under Torsion / Suktinės Stipriojo Betono Dėžinio Skerspjūvio Sijos, Sustiprintos Išorine Plienine Skersine Armatūra

Bernardo

Lopes

2011

Journal of Civil Engineering and Management

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Some bridges have to withstand high levels of torsion forces. As a consequence, box type beams are often the obvious solution. It could be possible that the balance of transversal to longitudinal torsion reinforcement is not fully reached. If the transversal reinforcement is somehow underestimated, the box beam needs to be transversally strengthened. From the various solutions, external transversal reinforcement is certainly one possibility. The investigation presented here aimed to study such solution. The authors tested four hollow beams under pure torsion. The level of the non balanced ratio between internal longitudinal and transversal torsion reinforcement was one of the parameters that were considered in this investigation. Other parameter was the existence or the no existence of external transversal strengthening reinforcement. The experimental results of the tests have shown the effectiveness of the use of the external transversal strengthening steel reinforcement to compensate the lack of balance of internal transversal to longitudinal torsion reinforcement with respect to various behaviour aspects, such as: increasing of torque strength, increasing of ductility, increasing of cracking torsion moment, and better distribution of cracking. Santrauka Kai kurie tiltai turi atlaikyti dideles sukimo jėgas. Tam tikslui dažnai naudojamos dėžinio skerspjūvio sijos. Gali būti, kad tarp sukimui atlaikyti naudojamos skersinės ir išilginės armatūros ne visada pasiekiamas tinkamas balansas. Jei skersinė sija armuota nepakankamai, dėžinio skerspjūvio sijas gali tekti papildomai stiprinti. Vienas iš įvairių galimų stiprinimo variantų – armavimas išorine skersine armatūra. Šiame straipsnyje pateikiama tokio stiprinimo analizė. Autoriai išbandė keturias grynojo sukimo veikiamas dėžinio skerspjūvio sijas. Vienas iš tyrimo parametrų – skersinės ir išilginės sukimo armatūrų santykio nesubalansuotumo lygis. Kitas parametras – išorinės skersinės stiprinimo armatūros buvimas arba nebuvimas. Eksperimentinių tyrimų rezultatai parodė stiprinti naudojamos išorinės plieninės skersinės armatūros veiksmingumą, kompensuojant vidinės skersinės ir išilginės suktinės armatūrų tarpusavio nesubalansuotumą. Efektyvumas buvo įrodytas tokias aspektais: padidėjusi sukamoji galia ir elastingumas, padidėjęs plyšių atsiradimo sukimo momentas bei geresnis plyšių pasiskirstymas.

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“…Input data is obtained from experimental research (e.g., Amšiejus et al 2009Amšiejus et al , 2010. In the case of steel-concrete structures, stability occurs mainly in concrete columns reinforced by high strength steel bars (Kliukas et al 2010) and composite columns (Guezouli et al 2010;Kala et al 2010). Characteristics of concrete and steel-concrete structures include long-term effects such as creep and shrinkage, which may cause loss of strength (Au, Si 2011).…”

Section: Stability and Reliability Of Structuresmentioning

confidence: 99%

Geometrically Non-Linear Finite Element Reliability Analysis of Steel Plane Frames With Initial Imperfections / Plieninių Rėmų Su Defektais Geometriškai Netiesinė Baigtinių Elementų Patikimumo Analizė

Kala

2012

Journal of Civil Engineering and Management

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Abstract. The random load carrying capacity of steel plane frames with bracing stiffness is studied. The load carrying capacity is evaluated using the geometrically non-linear FEM analysis. The incremental stiffness matrix of a slightly curved element utilized in the non-linear incremental analysis is listed. Initial imperfections are considered as random variables. Statistical analysis and Sobol sensitivity analysis are performed using the Latin Hypercube Sampling method. The effect of initial random imperfections on the load carrying capacity is studied, whilst assuming constant slenderness of the columns. The evaluation parameters are the pair of non-random values of elastic bracing stiffness, and system length of the columns. The paper illustrates that the load carrying capacity is very sensitive to initial crookedness of the columns in the event that the non-sway (symmetric) and sway (anti-symmetric) buckling modes coincide. In this case, the design load carrying capacity obtained from statistical analysis according to the EN 1990the EN (2002 standard is relatively very small (of low safety). Results show that the reliability of design of a steel frame according to EUROCODE 3 (1993) is significantly misaligned. The significance of the first and the second buckling forces as indicators of sensitivity of the load carrying capacity to the imperfections is discussed.

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The Quasi-Ductile Resistance of Compressed Spun Concrete Beam‐columns

Cited by 8 publications

References 7 publications

Experimental study of CFST column to steel beam bolted connection with curved end-plates

Experimental study of CFST column to steel beam bolted connection with curved end-plates

High-Strength Concrete Hollow Beams Strengthened With External Transversal Steel Reinforcement Under Torsion / Suktinės Stipriojo Betono Dėžinio Skerspjūvio Sijos, Sustiprintos Išorine Plienine Skersine Armatūra

Geometrically Non-Linear Finite Element Reliability Analysis of Steel Plane Frames With Initial Imperfections / Plieninių Rėmų Su Defektais Geometriškai Netiesinė Baigtinių Elementų Patikimumo Analizė

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