Shear Capacity of Clamped Deck Slabs Subjected to a Concentrated Load
Publication: Journal of Bridge Engineering
Volume 25, Issue 7
Abstract
Reinforced concrete (RC) deck slabs without transverse reinforcement are commonly used in bridge structures. The ability of RC slabs to distribute concentrated loads due to the pressure of wheels in a transverse direction is an important property for their verification. The main goal of this paper is to investigate the effect of the redistribution of shear forces on the load-carrying capacity of RC slabs subjected to a concentrated load. Several methods and design models for the assessment of one-way shear capacity were tested and statistically evaluated according to the results of 43 experiments carried out in the last two decades. The analyses showed that the effective shear width method provides unsafe results for higher values of the clear shear span to effective depth ratio unless the same limits are not imposed. Limiting the distance of the critical section from the inner edge of the loaded area significantly improved the accuracy of the method. The best results were obtained for the ACI 318-14 and AASHTO LRFD models in combination with a French approach when the CoV reached values of 0.091 and 0.097, respectively. A comparable degree of accuracy was provided also by a method that is based on a combination of a linear FEM analysis and Critical Shear Crack Theory with a CoV equal to 0.102.
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Acknowledgments
This work was supported by the Slovak Research and Development Agency under Contract No. APVV-17-0204 and by the Scientific Grant Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic and the Slovak Academy of Sciences Contract No. VEGA 1/0254/19.
Notation
The following symbols are used in this paper:
- a
- distance of the load from the face of a support;
- as
- unitary area of longitudinal reinforcement;
- av
- free shear span;
- b
- width;
- bw
- effective width for shear;
- CRk,c
- empirical factor;
- cflex
- depth of the compression zone;
- d
- effective depth of the longitudinal reinforcement;
- dg,max
- maximum aggregate size;
- Ec
- Young's modulus for concrete;
- Es
- Young's modulus for steel;
- fcm
- mean value of the cylinder concrete strength (50% fractile);
- fck
- characteristic cylinder concrete strength (5% fractile);
- specified compressive strength of concrete use in design;
- fr
- modulus of rupture;
- Mcre
- moment causing flexural cracking at a section due to an externally applied load;
- Mmax
- factored bending moment at a section due to an externally applied load;
- m
- unitary bending moment;
- Vd
- shear force due to an unfactored dead load;
- Vi
- factored shear force at a section due to an externally applied load;
- VRd,c
- shear capacity without shear reinforcement;
- v
- unitary shear force;
- z
- lever arm;
- β
- factor accounting for an arching action;
- γC
- partial safety factor for concrete;
- ɛ
- longitudinal strain;
- ɛx
- longitudinal strain at the mid-depth; and
- ρ
- reinforcement ratio.
References
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Published In
Journal of Bridge Engineering
Volume 25 • Issue 7 • July 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jul 16, 2019
Accepted: Dec 31, 2019
Published online: Apr 24, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 24, 2020
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