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Dapped beams and corbels: Corrosion

Decembre , 19th 2020 | Author: Sergio Rodríguez (@) Read: 1799 times

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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.

 

Figure 1. Example of dapped beam 

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.

Figure 2. Dapped beams – S&T model

 

 

Spanish Concrete Code EHE-08, section 64.2

The following picture shows the section of the Spanish concrete code EHE for the dapped beam supported on short corbels. The main points, highlighted in yellow, are translated into English:

§Section 64.2 – These are conflictive points where problems are found such as cracking and concrete degradation, therefore, their use should be avoided if possible.

    

Figure 3. Spanish code EHE – Section §64.2

 

Therefore, this solution should be avoided as much as possible. Reinforcement congestion, poor access for maintenance, low ductility behaviour due to mainly shear demand or hidden reinforcement potential corrosion are some of the reasons against using this solution.

 

Obviously, outdoor structural solutions are more affected by environmental conditions and therefore potential corrosion issues. Some examples are presented below:

Figure 4. Advanced corrosion stage for dapped end +RC corbel connection in a Bridge deck over M-30, Madrid(*) 

 (*)For further information please refer to the following link:

https://tecyrsa.com/detalle-las-actuaciones-la-rehabilitacion-del-puente-la-avenida-del-mediterraneo-calle-30/

 

Figure 2. Advanced corrosion stage for dapped end +RC corbel in Bridge over Guadalfeo River, Granada (Spain)(**)

(**)Please refer to the following link, for further clarifications by Repairing Project authors:

http://www.ideam.es/wp-content/uploads/2017/03/Puente-sobre-el-r%C3%ADo-Guadalfeo.pdf

 

As it can be seen, this type of support is present in many bridges and it presents the same common problem: corrosion.

Figure 3. Highly corroded stage for bridge dapped end connection (Italy), Public and anonymous reaction after Marandi’s Bridge Collapse

Figure 4. M-40 Bridge over A-2 Barcelona Highway, close to Alcala Street in Madrid. Damaged waterproofing over Dapped End joint. Pictures taken by author. It is unknown if bridge structure is under inspection or pending to be repaired

 

Figure 5. M-40 Bridge close to Avenida de Logroño (Madrid). Cracked concrete phenomena is visible, the most probable reason is reinforcement expansion due to corrosion issue. Pictures taken by author. It is unknown if bridge structure is under inspection or pending to be repaired

 

Figure 6. Bridge Connection M-40 and Barajas Airport. Cracked concrete phenomena is visible, the most probable reason is reinforcement expansion due to corrosion issue. Pictures taken by author. It is unknown if bridge structure is under inspection or pending to be repaired

References

[1] EHE 08 – Spanish version

[2] Tecyrsa – Detalle de las actuaciones – Rehabilitacion del Puente de la avenida del mediterraneo – Calle 30

[3] Ideam – pdf – Puente sobre el rio Guadalfeo

 

Article written by Sergio RODRIGUEZ MORALES. Madrid 19th December.

| Download article | Times downloaded: 406

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About the author
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Sergio Rodríguez. Head of Engineering Area at TECNICAS REUNIDAS , S.A. - INITEC PLANTAS INDUSTRIALES.
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