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Showing 8 articles out of 28
Showing page 1 out of 4
Pages: 1 2, 3, 4,
Effect of an opening in the punching calculation
February , 8th 2021 | Prontubeam | Structures, Punching, Control perimeter
In this article, I would like to discuss the effect of an opening in the slab on the shear distribution and its punching resistance.
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It is also discussed the EC-2 recommendation of reducing the resistant control perimeter due to the presence of this opening and the effect of a moment in the punching calculation (so called beta value). Continue reading...
Surface reinforcement and skin reinforcement
Decembre , 12th 2020 | Prontubeam | Concrete, Calculation, Reinforcement
This article explains when the surface reinforcement should be added and the difference with the skin reinforcement. The Eurocode 2 (EN 1992-1-1: 2004) is used in this article. Particularly, the surface reinforcement is explained in annex J. However, we must emphasize that this annex of Eurocode 2 is informative.
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First of all, we are going to clarify that the surface reinforcement and the skin reinforcement are not the same, although these two names are sometimes used interchangeably. The book "Designers' Guide to EN1992-1-1 and EN1992-1-2" determines the difference. Continue reading...
Contribution of longitudinal reinforcement in punching resistance
Decembre , 22th 2020 | Prontubeam | Structures, Punching, Calculation
On January 14 (2020), a children's playground collapsed over an underground car park in Santander, Spain. Miraculously, no victims are found so far. If we look at the images, it can be seen the parking columns "crossing trough" the playground. This is known as punching failure.
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This type of failure has already been seen in other cases like in the collapse of a swimming pool or a car park. Continue reading...
Part 2: Structures under earthquake. Calculation example using a FEM program
Decembre , 12th 2019 | Prontubeam | Structures, Eartquake, FEM calculation
In our article, “Structures under earthquake effects-Calculation example”, Prontubeam did a hand-made calculation of a simplified two level storey structure under earthquake. At the end of the article we wondered if the simplified model used in that example would lead to the same results as a more accurate one using FEM.
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We decided to do an accurate model and study/compare the results. Continue reading...
Dapped beams and corbels: Corrosion
Decembre , 19th 2020 | Sergio Rodríguez | Concrete, Calculation, Dapped beam
Dapped end beam supported by a short corbel represents a recurrent structural solution for precast systems and those architectural solutions where it is requested to preserve a continuous plane floor, without geometrical irregularities.
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From a structural engineering point of view, the connection represents an interesting problem to be solved, in which it is necessary to gather a good knowledge about Tie & Strut Methodology as well as dedicated geometric study about correct reinforcement placement, mainly in narrow sections like DTS (Double Tee Slabs) o Box girder Sections. Continue reading...
Shear lugs and anchors in anchor plates: Shear distribution
Decembre , 3th 2020 | Prontubeam | Structures, Anchor plate, Shear lug
When the anchor plates are subjected to significant shear forces, an I-shaped, rectangular or tubular profile, also known as a shear lug, is usually welded to their lower part.
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In many calculations, it is assumed that the shear is transmitted entirely through the shear lug, thus working the anchors only in tension. The objective of this article is to study whether this hypothesis is correct. Continue reading...
The analysis of an aggregate loading with the use of coupling of numerical calculations by the discrete element method with the finite element method
November , 19th 2020 | Michał Szulewski | Structures, Calculation, FEM/DEM
The article presents numerical calculations of container loaded with loose material, i.e. mineral aggregate.
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The strength analysis was performed using the finite element method, loading the structure with the pressure field generated in the analysis using the discrete element method Continue reading...
Why is so difficult to accurately design a pavement?
September , 8th 2019 | Felipe Cava | Engineering, Roads, Desing
For a long time, the charts developed through the AASHO Road Test, and something still in force in Brazil through DNER method (1981), led us to a brief and hasty conclusion that pavement structures are easy to design.
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From basic physics we know tire inflation pressure is the ratio between the load carried and the area of load distribution. It is precisely in these small issues that the difficulty of accurately designing a pavement begins. Continue reading...
Showing 8 articles out of 28
Showing page 1 out of 4
Pages: 1 2, 3, 4,
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