Full-Scale Bending Test Study for PC Hollow Slab Girder Using UHPFRC and Composite Reinforcement Techniques
Publication: Journal of Bridge Engineering
Volume 25, Issue 12
Abstract
Ultra-high performance fiber reinforced cementitious (UHPFRC) and composite reinforcement techniques have great potential in achieving efficient structural resistance recovery and overall performance enhancement. The goal of this study is to confirm the reinforcement effectiveness by conducting test and analytical studies for three full-scale prestressed concrete hollow slab girders with insufficient bending capacity and stiffness. In this full-scale test study, four-point loading was adopted for one of the test girders before reinforcement to acquire the residual bending performance. Reinforcement measures were then carried out for all three test girders, including a composite concrete (or UHPFRC) layer for the top flange and a steel plate–concrete (or UHPFRC) composite reinforcement for the bottom flange, and bending tests were conducted after reinforcement. Based on the test results, simplified analytical models were developed and empirical equations were proposed for test girders after reinforcement. The present study has proved the effectiveness of UHPFRC and composited reinforcement measures in improving capacity, stiffness, and guarantee of durability comprehensively.
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Acknowledgments
The authors acknowledge the financial support provided by Scientific Research Project of Department of Transportation in Shaanxi Province (16–31 K), the Special Fund for Basic Scientific Research of Central Colleges of the People's Republic of China, Chang’an University (Grants 300102219309), China National Ten-Thousand People Program Technology Innovation Leading Talents Support Project (W03020659), and Bridge Damage Resistance Design and Safety Maintenance Technology Innovation Team in Ministry of Transport of the People's Republic of China.
Notation
The following symbols are used in this paper:
- Ap
- area of prestressed reinforcement in tensile part;
- As
- area of reinforcements in bottom flange (tensile part);
- area of reinforcements in top flange (compressive part);
- Asp
- area of strengthening steel plate in tensile part;
- ap
- distance from resultant point of tensile prestressed reinforcements to the bottom edge of tensile zone;
- as
- distance from resultant point of tensile reinforcements to the bottom edge of tensile zone;
- distance from resultant point of compressive reinforcements to the top edge of compressive zone;
- at
- thickness of concrete or UHPFRC layer above top flange;
- aU
- distance from resultant point of UHPFRC under bottom flange to the bottom edge of tensile zone;
- b
- width of bottom flange;
- width of top flange;
- bw1
- thickness of one web;
- bw2
- thickness of the other web;
- b(x)
- net width of girder at calculating location;
- Cc
- internal axial force of compressive UHPFRC and concrete;
- internal axial force of compressive reinforcement;
- Es
- elastic modulus of reinforcement and steel plate;
- EUt
- elastic modulus of UHPFRC in tensile zone;
- fcr1
- deformation at midspan section corresponding to Pcr1;
- fcr2
- deformation at midspan section corresponding to Pcr2;
- fu
- deformation at midspan section corresponding to Pu;
- fy
- deformation at midspan section corresponding to Py;
- h
- distance from the centroid of strengthening steel plate to the top of the strengthened girder;
- thickness of top flange;
- hr
- distance from the centroid of tensile steel reinforcements to the top edge of the strengthened girder;
- M
- bending moment at midspan section;
- calculated moment at cracking state for reinforcement part;
- Mcr2,t
- tested moment at cracking state for reinforcement part;
- calculated moment at ultimate state;
- tested moment at ultimate state;
- calculated moment at yielding state;
- tested moment at yielding state;
- Pcr1
- load as concrete crack start developing in PC girder;
- Pcr2
- load of incipient cracking in reinforcement part;
- Pu
- ultimate capacity;
- Py
- yield load of the strengthening steel plate;
- Tp
- internal force of prestressed reinforcements;
- Ts
- internal force of steel reinforcements in bottom flange;
- Tsp
- internal force of steel plate in composite strengthening part for bottom flange;
- TU
- internal force of UHPFRC in composite strengthening part for bottom flange;
- x
- distance from calculation position in the compression zone to neutral axis;
- xc
- depth of the compressive zone;
- Δσp
- tensile stress increment of prestressed reinforcement;
- Δɛp
- tensile strain increasement of prestressed reinforcement;
- ɛc
- compressive strain of concrete in PC girder;
- compressive strain of concrete at position of x;
- ɛhc
- compressive strain of concrete or UHPFRC above the top flange;
- compressive strain of UHPFRC or concrete at position of x;
- ɛs
- tensile strain of reinforcement in bottom flange;
- compressive strain of reinforcements in top flange;
- ɛsp
- tensile strain of steel plate;
- ɛspy
- yielding strain of steel plate;
- ɛsy
- yielding strain of reinforcement in bottom flange;
- ɛUt
- tensile strain of UHPFRC;
- ɛUtu
- ultimate tensile strain of UHPFRC;
- compressive stress of concrete corresponding to ;
- compressive stress corresponding to ;
- σs
- tensile stress of reinforcement in bottom flange;
- compressive stress of reinforcement in top flange;
- σsp
- tensile stress of steel plate;
- σspy
- yielding stress of steel plate;
- σsy
- yielding stress of reinforcement in bottom flange;
- σUt
- tensile stress of UHPFRC;
- σUte
- velastic stress of tensile UHPFRC; and
- σUtu
- ultimate tensile stress of UHPFRC.
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© 2020 American Society of Civil Engineers.
History
Received: Nov 17, 2019
Accepted: Jun 16, 2020
Published online: Sep 22, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 22, 2021
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