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Effect of Rib Geometry in Steel–Concrete Composite Beams with Deep Profiled Sheeting

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Abstract

Presented are the results from a finite element model of steel–concrete composite beams with deep decks and a comparison with various analytical/design methods. Using a deck deeper than 80 mm are becoming popular with a desire for longer spanning capability and lower concrete volume. However, there are no design rules in either American or European design codes for using a deck deeper than 80 mm, as both codes limit the deck rib height to 75 and 85 mm, respectively for using the stud’s capacity formula. Therefore, research is needed to establish the design stud capacity in beams with decks deeper than 80 mm. After extensive validation, the 3-D FE model is used for a parametric study with tests having decks deeper than 80 mm. The parameters include rib geometries, studs’ layout and concrete slab reinforcements. The FE results showed that stud capacity with narrow and deep decks (100–150 mm) is about 70% of the conventional decking (60–80 mm deep). The stud capacities from the numerical results were compared to the predicted strengths from the design/theoretical models. While the equations from the concrete pull-out failure mode by Johnson and Yuan (Proc Inst Civ Eng Struct Build 128(3):252–263, 1998) gave reasonable predictions with a coefficient of variation as 11%, both EC4 and ANSI/AISC rules provided inaccurate and inconsistent predicted strengths. A generalised stud capacity formula should be developed in the design codes for decks deeper than 80 mm.

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Abbreviations

A s :

Cross-sectional area of shear connector stud

A Wulst,eff :

Effective area of weld collar

b o :

Average rib width of profiled steel deck

C:

Central position of stud

c1, c2 :

Material constants equal to 3.0 and 6.93, respectively

d :

Diameter of shear connector stud

d c :

Compressive damage variable

d t :

Tensile damage variable

d Wulst :

Diameter of weld collar

e :

Distance from centre of stud to nearer wall of rib

E c :

Young’s modulus of concrete

E cm :

Secant modulus of elasticity of concrete

E s :

Young’s modulus of steel

F:

Favourable position of stud

f c :

Compressive cylinder strength of concrete

f cm :

Mean value of concrete cylinder compressive strength

f cu :

Compressive cube strength of concrete

f t :

Tensile strength of concrete

f u :

Minimum ultimate tensile strength of shear connector stud

f uk :

Characteristic tensile strength of shear connector stud

f y :

Yield stress of steel

f yp :

Yield strength of sheeting

G f :

Fracture energy of concrete

G fo :

Initial fracture energy of concrete

h p :

Rib height of profiled steel deck

HPS:

High Performance Steel

h sc :

Total height of shear stud connector

h Wulst :

Height of weld collar

kcpt, kcpt, ηcpt, ηcpt :

Non-dimensional group for concrete pull-out failure mode

krp, kcp, ηrp, ηcp :

Non-dimensional group for punching and concrete pull-out failure mode

k t :

Reduction factor

N r :

Number of studs per rib

P AISC :

Nominal unfactored design strength calculated from American code

P CPT :

Shear connector resistance per stud obtained from concrete pull-out failure mode

P EC4 :

Nominal unfactored design strength calculated from European code

PFE :

Shear connector resistance per stud obtained from the finite element analysis

P m,c :

Shear connector resistance per stud obtained from concrete failure

P m,s :

Shear connector resistance per stud obtained from stud failure

P Rm :

Mean shear resistance of stud

P RPCP :

Shear connector resistance per stud obtained from rib punching and concrete pull-out failure mode

PTest :

Shear connector resistance per stud obtained from experiments

Rg, Rp :

Reduction factors specified in the American Code

s t :

Transverse centre to centre spacing between studs

t s :

Thickness of profiled steel decking

T y :

Resistance of shear stud to uniaxial tension

U:

Unfavourable position of stud

v tu :

Shear strength of concrete

w :

Crack opening displacement

w c :

Ultimate crack opening displacement

w o :

Density of concrete

ε c ~in :

Compressive inelastic strain of concrete

ε c ~ pl :

Compressive plastic strain of concrete

ε y :

Plastic strain of steel

σ c :

Compressive stress of concrete

σ c0 :

Initial yield stress of concrete

σ cu :

Ultimate compressive stress of concrete

σ t :

Tensile stress of concrete

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Acknowledgements

The authors would like to acknowledge the University of East London for their facilities. Also, the first author is sincerely grateful to the Higher Committee for Education Development in Iraq for his PhD study.

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Correspondence to Jawed Qureshi.

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Albarram, A., Qureshi, J. & Abbas, A. Effect of Rib Geometry in Steel–Concrete Composite Beams with Deep Profiled Sheeting. Int J Steel Struct 20, 931–953 (2020). https://doi.org/10.1007/s13296-020-00333-5

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  • DOI: https://doi.org/10.1007/s13296-020-00333-5

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