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

2020 ◽  
Vol 208 ◽  
pp. 109515
Author(s):  
Alessandro Lipari
Keyword(s):  
Comparative Study ◽  
Design Methods ◽  
Concrete Slabs ◽  
Shear Design

scholarly journals A comparative study in flexure and shear design of spread footings

2019 ◽  
Vol 16 (1) ◽  
pp. 23-29
Author(s):  
Iago Freitas de Almeida ◽  
Maurício Castelo Branco de Noronha Campos ◽  
Romilde Almeida de Oliveira
Keyword(s):  
Comparative Study ◽  
Structural Engineering ◽  
Reinforcement Rate ◽  
The Other ◽  
Shear Effect ◽  
Analytical Analysis ◽  
Spread Footing ◽  
Shear Design ◽  
Spread Footings

The design of spread footings is a field widely explored in structural engineering being the flexure and shear design verified by the use of codes. The objective of this paper consists in a comparative study of spread footing design between the Brazilian’s code, Eurocode and American’s code. The methodology considered an analytical analysis with three different examples in the flexure and shear design of the spread footings with different loads and footing height. The results show that the American’s code presented the minimum required value of reinforcement rates ​​in all examples and also was the only code that verified the punching and shear effect for all studied cases. In Eurocode flexure design, the results show that in the most examples, the reinforcement rate is higher than that considered by the other codes. The Brazilian code presented an inconsistency in the verification of the punching effect for one of the studied examples, requiring, therefore, a review and a modification of the code.

Comparative Study of Rebound Hammer, Nitto Hammer, and Pullout Tests to Estimate Concrete In-Place Strength by Using Random Sampling Analysis

2017 ◽  
Vol 2629 (1) ◽  
pp. 104-111 ◽  
Author(s):  
Agustin Spalvier ◽  
Kerry Hall ◽  
John S. Popovics
Keyword(s):  
Nondestructive Testing ◽  
Comparative Study ◽  
Random Sampling ◽  
Pullout Test ◽  
Concrete Slabs ◽  
Destructive Testing ◽  
Rebound Hammer ◽  
Pullout Tests ◽  
Combine Uncertainty

The use of nondestructive testing (NDT) techniques to estimate concrete in-place strength has been broadly studied, with proof of their usefulness in complementing destructive testing (DT). However, the use of DT techniques still dominates. The main objective of this investigation was to compare the performance of three NDT techniques—the rebound hammer, Nitto hammer, and pullout tests—to determine in-place strength. NDT-versus-strength correlation curves were fit to data measured from thick concrete slabs. Strength was measured from cast-in-place cylinders. Analyses of NDT sensitivity, uncertainty, and variability are presented. A new parameter to quantify the performance of the NDT techniques is proposed. This parameter is the limit error between the measured and estimated strengths, which combine uncertainty and variability analyses. The analysis shows that the least limit error for predicting in-place strength was achieved by the rebound hammer test when one testing location was considered or by the pullout test for two or more testing locations.

The Effective Width in Shear Design of Wide-shallow Beams: A Comparative Study

2019 ◽  
Vol 23 (4) ◽  
pp. 1670-1681 ◽  
Author(s):  
Abd El-Hakim Khalil ◽  
Emad Etman ◽  
Ahmed Atta ◽  
Ahmed Baraghith ◽  
Reda Behiry
Keyword(s):  
Comparative Study ◽  
Effective Width ◽  
Shear Design

scholarly journals Laboratory Characterization of The Load Transfer-Crack Width Relation for Innovative Short Concrete Slabs Pavements

2020 ◽  
Vol 15 (1) ◽  
pp. 232-250 ◽  
Author(s):  
Mauricio Pradena ◽  
Lambert Houben ◽  
Andrés César
Keyword(s):  
Structural Design ◽  
Crack Width ◽  
Load Transfer ◽  
Plain Concrete ◽  
Design Methods ◽  
Transfer Efficiency ◽  
Concrete Slabs ◽  
Concrete Pavements ◽  
Load Transfer Efficiency ◽  
Reduced Scale

Aggregate interlock is the dominant load transfer mechanism in non-dowelled Jointed Plain Concrete Pavements, as the innovative short concrete slabs. Although the Load Transfer Efficiency of this pavement innovation is based on that mechanism, the structural design methods do not relate the Load Transfer Efficiency by aggregate interlock with its direct cause, which is the Crack Width under the joints. The objective of the present article is to characterise in the laboratory the Load Transfer Efficiency−Crack Width relation for innovative short slabs Jointed Plain Concrete Pavements. Additionally, as an alternative to large-scale laboratory tests to study the Load Transfer Efficiency, a practical test on a reduced scale is proposed. The results confirmed that short slabs Jointed Plain Concrete Pavements with high-quality aggregates are able to provide adequate Load Transfer Efficiency (above 70%) without dowels bars. Based on the laboratory results, complemented with previous field data, a Load Transfer Efficiency−Crack Width curve is proposed and made available for structural design methods of short slabs Jointed Plain Concrete Pavements. Finally, the laboratory test on a reduced scale is useful to develop specific Load Transfer Efficiency−Crack Width relations using standard equipment available in traditional concrete laboratories.

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