Experimental study of shear transfer in slim floor systems using precast concrete hollow core slabs and steel beam with web circular opening

Coldebella, Gustavo; Pereira Junior, Sineval Esteves; De Nardin, Silvana

doi:10.1590/S1983-41952022000300006

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ORIGINAL ARTICLE • Rev. IBRACON Estrut. Mater. 15 (3) • 2022 • https://doi.org/10.1590/S1983-41952022000300006 copy

Experimental study of shear transfer in slim floor systems using precast concrete hollow core slabs and steel beam with web circular opening

Estudo experimental da transferência de forças de cisalhamento em pisos mistos de pequena altura com lajes pré-fabricadas de concreto e viga em aço com abertura circular na alma

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Steel-concrete slim flooring system using precast concrete hollow core slabs and steel beam with web openings is an innovative construction system designed to combine the high bending resistance of both precast prestressed hollow core slabs and steel beam with web openings. This system can provide floor systems with a minimum constructional depth in comparison with ordinary composite floors. The aim of this study was to evaluate in an exploratory way the shear transferring mechanism between the steel beam with circular web opening and the precast hollow-concrete slab. The shear connection is formed by in-situ concrete passes through the web openings and infill the voids of the precast slabs. One push-out test was conducted to investigate the shear transferring mechanism of shear connection and the experimental results were compared to analytical methods. The shear resistance of the shear connection was predicted with good accurate by analytical methods.

Keywords:
slim floor; push-out test; concrete hollow core slabs; beam with web opening; shear connection

Huo and D’Mello [⁹9 B. Y. Huo and C. A. D’Mello, "Push-out tests and analytical study of shear transfer mechanisms in composite shallow cellular floor beams," J. Construct. Steel Res., vol. 88, pp. 191–205, 2013.]	Chen et al. [¹⁰10 S. Chen, T. Limazie, and J. Tan, "Flexural behavior of shallow cellular composite floor beams with innovative shear connections," J. Construct. Steel Res., vol. 106, pp. 329–346, 2015.]
Resistance force for one concrete dowel
$R_{c} = 1.68 \cdot (f_{c u} \cdot A_{c}) + 1.44 \cdot (f_{c t m} \cdot A_{t})$	$R_{c} = 1.30 \cdot (f_{c u} \cdot A_{c}) + 1.15 \cdot (f_{c t m} \cdot A_{t})$

Steel beam
Component	Modulus of elasticity [GPa]	Yield strength [MPa]	Ultimate strength [MPa]
Top and bottom flange	200⁽¹⁾	298.85⁽²⁾	421.52⁽²⁾
web	200⁽¹⁾	309.25⁽²⁾	428.99⁽²⁾

Concrete slab
Type	Modulus of elasticity [GPa]	Cylinder compressive strength [MPa]	Tensile strength [MPa]
Hollow core slab	35.42⁽³⁾	40⁽³⁾	3.51⁽³⁾
Infill concrete	27.41⁽²⁾	34.06⁽²⁾	2.28⁽²⁾

Load [kN]		Slip [mm]
Load [kN]		TD1-SE	TD1-SD	TD2-SE	TD2-SD*	TD1-CE	TD1-CD	TD3-CE
I	73.63	0.05	0.01	0.12	0.00	0.03	0.03	0.03
I	60.80	0.10	0.02	0.16	0.02	0.07	0.05	0.06
II	76.09	2.44	0.65	2.61	0.68	2.39	0.65	2.34
II	67.16	6.33	4.46	6.49	4.51	6.32	4.30	6.25
III	80.44	12.23	10.36	12.36	10.45	12.25	9.95	12.17

Shear resistance of one shear connection R_c (kN)
Experimental	Theoretical values
	Huo and D’Mello [⁹9 B. Y. Huo and C. A. D’Mello, "Push-out tests and analytical study of shear transfer mechanisms in composite shallow cellular floor beams," J. Construct. Steel Res., vol. 88, pp. 191–205, 2013.]	Chen et al. [¹⁰10 S. Chen, T. Limazie, and J. Tan, "Flexural behavior of shallow cellular composite floor beams with innovative shear connections," J. Construct. Steel Res., vol. 106, pp. 329–346, 2015.]
80.44	114.42 (+42.2%)	89.62 (+11.4%)

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E-mail: arlene@ibracon.org.br

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[1] Corresponding author: Sineval E. Pereira Junior. E-mail: sineval@estudante.ufscar.br