A comparative study of shear design methods for straight and skew concrete slabs

Lipari, Alessandro

doi:10.1016/j.engstruct.2019.109515

Cited by 3 publications

(10 citation statements)

References 29 publications

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“…Additionally, since there is no clear consensus on how to evaluate the shear capacity of slab bridges [14], the application of a new approach is presented herein. The selected procedure comes from Lipari, who proposed variations to extend shear design code provisions for straight geometries to skewed geometries [32]. These procedures will be elaborated in Section 3.2.2.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Then, the direction of the principal shear force, which is expected to be comparable to the skew angle, is given by [32]:…”

Section: Number Of Loaded Lanesmentioning

confidence: 99%

“…Finally, the moment in the direction of the principal shear force is calculated as [32]: A section cut parallel to the longitudinal direction is used to determine the design moments for transverse flexural reinforcement. This cut is made at the location of the maximum secondary transverse bending moment (see Figure 6).…”

Section: Number Of Loaded Lanesmentioning

confidence: 99%

“…Finally, the moment in the direction of the principal shear force is calculated as [32]: The design moments and shear forces for shear design are taken at the location of the critical shear section. They are resolved in the direction of the principal shear force, which is calculated as follows [32]:…”

Section: Number Of Loaded Lanesmentioning

confidence: 99%

“…Finally, the need for minimum shear reinforcement is determined. To do so, the area of the main longitudinal reinforcement is resolved in the direction of the principal shear force as follows [32]:…”

Section: Number Of Loaded Lanesmentioning

confidence: 99%

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Parametric Study on the Applicability of AASHTO LRFD for Simply Supported Reinforced Concrete Skewed Slab Bridges

Moya

Lantsoght

2021

Infrastructures

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Simplified code provisions can be used for the analysis and design of straight slab bridges. However, several studies question the appropriateness of simplified procedures for skewed geometries. This paper provides practical insights to the designer regarding the effects of skewness in reinforced concrete slab bridges by evaluating how simplified and more refined analysis procedures impact the design magnitudes and resulting reinforcement layouts. The methods used for this study are analytical and numerical case studies. Eighty case study slab bridges with varying lengths, widths, and skew angles are subjected to the AASHTO HL-93 loading. Then, the governing moments and shear forces are determined using the AASHTO LRFD simplified procedures with hand calculations, and using linear finite element analysis (LFEA). Afterwards, the reinforcement is designed according to the AASHTO LRFD design provisions. From these case studies, it is found through the LFEA that increasing skew angles result in decreasing amounts of longitudinal reinforcement and increasing amounts of transverse flexural reinforcement. Comparing the reinforcement layouts using AASHTO LRFD-based hand calculations and LFEA, we find that using LFEA reduces the total weight of steel reinforcement needed. Moreover, as the skew increases, LFEA captures increased shear forces at the obtuse corner that AASHTO LRFD does not. In conclusion, it is preferable to design the reinforcement of skewed reinforced concrete slab bridges using LFEA instead of hand calculations based on AASHTO LRFD for cost reduction and safety in terms of shear resistance in the obtuse corners.

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Section: Literature Reviewmentioning

confidence: 99%

“…Then, the direction of the principal shear force, which is expected to be comparable to the skew angle, is given by [32]:…”

Section: Number Of Loaded Lanesmentioning

confidence: 99%

Section: Number Of Loaded Lanesmentioning

confidence: 99%

Section: Number Of Loaded Lanesmentioning

confidence: 99%

Section: Number Of Loaded Lanesmentioning

confidence: 99%