Abstract
A new type of prestressed composite recycled aggregate floor slab was developed and its flexural performance was studied. The composite floor comprises a top cast-in-place slab made of recycled coarse aggregate concrete and a bottom precast concrete slab with grouted steel tube trusses. The cracking load, ultimate load, deflection, steel tube strain, concrete strain and failure process are studied for different contents of recycled coarse aggregates. Results show that the mechanical performance of the prestressed composite recycled aggregate slab has two distinctive stages. And the load bearing capacity decreases with the increase in the amount of recycled coarse aggregates. When the composite slab fails, the prestressed steel wires in the tension zone yield and concrete in the compression zone is crushed. This failure characteristic reflects that the reinforcement ratio of the component is appropriate. The cracking moment and ultimate moment calculation formulas of the composite slab are established and could predict the cracking and failure points. In the formulas, the influence of the amount of recycled coarse aggregates on the flexural capacity is considered. By controlling the content of recycled aggregates, the composite slabs with steel tube trusses can be sued in practical applications.
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Abbreviations
- A 0 :
-
Converted section area
- A p :
-
Area of prestressed steel wires
- A′c :
-
Grouting material section area
- A′s :
-
Steel tube section area
- a′s :
-
Distance from the upper edge of the specimen section to the centroid of the steel tubes
- b :
-
Specimen section width
- f c :
-
Design axial compressive strength of upper layer concrete
- f′c :
-
Design axial compressive strength of steel tube grouting material
- f tk :
-
Standard value of axial compressive strength of concrete of the bottom precast slabs
- h :
-
Thickness of bottom precast slabs
- h 0 :
-
Effective height of the specimen section
- I 0 :
-
Moment of inertia of the converted section
- M cr :
-
Cracking moments according to formulas given in this paper
- M′cr :
-
Experimental cracking moments
- M cr1 :
-
Cracking moments according to specification
- M u :
-
Ultimate moments according to formulas given in this paper
- M u1 :
-
Ultimate moments according to specification
- M′u :
-
Experimental ultimate moments
- N :
-
Content of recycled aggregates
- u cr :
-
Deflection when cracking appeared in concrete
- u u :
-
Deflection when the composite slabs reached the ultimate load
- P cr :
-
Load when cracking appeared in concrete
- P u :
-
Load when the composite slabs reached the ultimate load
- W 0 :
-
Tension edge resistance moment of the converted section
- x :
-
Height of concrete compression zone
- y 0 :
-
Height of section centroid
- α 1 :
-
Coefficient equal to 1 when the strength of the upper concrete does not exceed 50 MPa
- γ :
-
Plastic influence coefficient of concrete member section resistance moment
- γ m :
-
Basic value of plastic influence coefficient of concrete member section resistance moment
- σ 1 :
-
Prestress loss value
- σ con :
-
Tension control stress of prestressed wires
- σ pc :
-
Tensile stress in concrete due to prestress after deducting prestress losses
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Acknowledgments
This study was supported by open fund project of West China Green State Key Laboratory (LSKF201705), Shandong Province Key Research and Development Project (2017GSF216006) and Shandong Province Housing Urban and Rural Construction Science and Technology Project (2017-K5-002). The authors would like to express their gratitude to EditSprings (https://www.editsprings.cn) for the expert linguistic services provided.
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Liu, E., Lin, M., Xie, Q. et al. Flexural Performance of Prestressed Composite Recycled Aggregate Slabs with Steel Tube Trusses. KSCE J Civ Eng 26, 5253–5263 (2022). https://doi.org/10.1007/s12205-022-0563-x
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DOI: https://doi.org/10.1007/s12205-022-0563-x