Abstract
According to most of current design standards, the need for high strength and ductility of reinforced concrete frame structures is accomplished utilizing a high amount of transverse reinforcement in beam–column joints. Reinforcement congestion can be overcome by means of Fiber Reinforced Concrete and High Performance Fiber Reinforced Concrete, which are known to improve the structural performance of single structural members or beam–column joints. Through an extended numerical simulation, this paper elaborates the overall benefits of using fiber reinforced concrete materials in critical regions to the seismic behaviour of regular reinforced concrete frame structures. An extensive number of non-linear static and dynamic analyses with distributed plasticity and fibre sections are performed to compare the behaviour of simple reinforced concrete and mixed reinforced concrete/fiber reinforced concrete frames in terms of total base shear and fragility curves and failure mechanisms. Even if execution and technological aspects are beyond the scope of the present work, the use of fiber reinforced concretes in critical regions of mixed frames seems to improve the structural performance of reinforced concrete frames at a global level.
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Abbreviations
- ρ :
-
Reinforcement ratio
- d c :
-
Lateral displacement of the control point (centroid of the top floor)
- f y :
-
Steel strength at yielding
- E s, E cm :
-
Moduli of elasticity of the steel and of the concrete
- b :
-
Strain-hardening ratio (ratio between post-yield and initial moduli)
- w u :
-
Maximum crack opening accepted in structural design
- CMOD 1, CMOD 3 :
-
Crack mouth opening displacements at the SLS and ULS
- l cs :
-
Characteristic length of the element
- εSLS :
-
CMOD1/lcs
- εtu :
-
Ultimate tensile strain in uniaxial tension
- R ck , f ck :
-
Characteristic values of concrete compressive strength on cubes and cylinders
- f cd, f ctd :
-
Design values of concrete strength in compression and in tension (on cylinders)
- εcu, εtu :
-
Design values of concrete ultimate strains in compression and in tension
- f yk , f yd :
-
Characteristic and design values of steel strength in tension
- εsd :
-
Design value of steel ultimate strain in tension
- K :
-
Strength amplification factor for concrete
- εc0 :
-
Design value of concrete compressive strain at the peak stress
- Z :
-
Strength reduction factor for confined concrete after the peak stress
- σc1, εc1 :
-
Design values at the first point in concrete trilinear model
- σc2, εc2 :
-
Design values at the second point in concrete trilinear model
- σc3, εc3 :
-
Design values at the third point in concrete trilinear model
- εt1, εt2 :
-
Tensile strain at zero stress, and ultimate strain in concrete trilinear model
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Candido, L., Micelli, F. Seismic behaviour of regular reinforced concrete plane frames with fiber reinforced concrete in joints. Bull Earthquake Eng 16, 4107–4132 (2018). https://doi.org/10.1007/s10518-018-0325-9
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DOI: https://doi.org/10.1007/s10518-018-0325-9