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The resistance of compressed spun concrete members reinforced by high-strength steel bars

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Abstract

The expediency of using precast spun concrete columns and other members of annular cross sections reinforced by high-strength steel bars is discussed. Test material properties and production, curing and testing procedures, response factors and ultimate compressive stresses of plain and reinforced spun concrete specimens are presented. The strength and strain features of compressed tubular reinforced concrete members are considered. Modeling of a bearing capacity of eccentrically loaded members of annular cross sections is based on the concepts of bending with an concentrical force and compression with a bending moment. The comparison of modeling and test data of concentrically and eccentrically loaded members is analysed.

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Abbreviations

A c and A s :

Cross-sectional areas of concrete and reinforcement sections

E c and E s :

Moduli of elasticity of concrete and reinforcement

M E :

Applied total bending moment

M R :

Resisting bending moment

N E :

Applied total compressive force

N EP :

Quasi-permanent compressive force

N R :

Resisting compressive force

d :

Outer diameter of annular cross sections

e 0 :

First order eccentricity

e = e 0η:

Second order eccentricity

f′ c :

Sustained strength of concrete

f c and f cm :

Cylinder (compressive) strength of concrete and its mean value

f c1 :

Compressive strength of spun concrete hollow cylinders

f c2 :

Compressive strength of spun concrete in reinforced members

f st and f sc :

Conventional strengths of reinforcement in tension and compression

h :

Height of tubular specimens

f cc :

Compressive strength of spun concrete in tubular members

f pr :

Prism strength of concrete

f 0.2 :

0.2% proof-stress of reinforcement

k c and k s :

Efficiency factors for compressive concrete and reinforcement sections

k p :

Factor of a quasi-permanent load effect

k 2 :

Conversion factor of a hollow cylinder effect

r 1 and r 2 :

Radii of annular cross section circles

r s :

Radius of the reinforcement circle

t = r 2−r 1 :

Thickness of annular cross sections

δ:

Coefficient of variation

γ:

Partial safety factor

ɛ c1 :

Compressive strain in the concrete at the peak stress f c1

ɛ c2 and ɛ c3 :

Compressive strains in the concrete at the peak stress f c2 by typical and bi-linear stress-strain relations

ɛ′ cu and ɛ cu :

Ultimate compressive strains in the concrete adjacent with steel bars of concentrically and eccentrically loaded columns

ɛ′ s and ɛ s :

Ultimate compressive steel strains of concentrically and eccentrically loaded columns

η:

Factor of second order moment effect

θ:

Parameter which contains model uncertainties

λ:

Additional angle of the compression zone

ρ = A s /A c :

Reinforcement ratio

σ′ sc and σ sc :

Ultimate compressive steel stresses of concentrically and eccentrically loaded columns

ψ:

Angle of the total compression zone

References

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Author information

Authors and Affiliations

  1. Vilnius Gediminas Technical University, Saulėtekio al. 11, Vilnius, 10223, Lithuania

    Romualdas Kliukas

  2. KTU Institute of Architecture and Construction, Kaunas, Lithuania

    Antanas Kudzys

Authors
  1. Antanas Kudzys
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  2. Romualdas Kliukas
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Corresponding author

Correspondence to Romualdas Kliukas.

Appendix

Appendix

Tables 1 and 2 list essential properties of the reinforced spun concrete specimens. Each specimen has a numeric designation. The second letters A (Aksomitas) and K (Kliukas) relate to the names of researchers.

Table 1 Results of concentrical compression test on reinforced spun concrete members
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Table 2 Results of eccentrically compression test on reinforced spun concrete members
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Kudzys, A., Kliukas, R. The resistance of compressed spun concrete members reinforced by high-strength steel bars. Mater Struct 41, 419–430 (2008). https://doi.org/10.1617/s11527-007-9255-8

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  • DOI: https://doi.org/10.1617/s11527-007-9255-8

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