Reinforced Concrete Beam Hinge 6

[Myo Maung]

Hi All,

I am new to this web page, I have some questions regarding reinforcement, refer the link. I want to know the reinforcement can be done as per photo from the link. what kind of action will be inside this beam and in the reinforcement?

https://instahaha.com/p/B8HMnAbFpJ-.html

 

[hokie66]

That does appear to be an attempt to create a concrete hinge, probably in the mistaken belief that it is necessary to prevent torsion on the supporting beam. It is more likely that that curious arrangement will cause beam shear failure.

 

[HTURKAK]

Apparently the hinge is provided to avoid torsional moment to the supporting beam. If the concrete is cast with EJ, (with inserting polystren board ), the reinforcement bars shall be designed to carry the full shear load and neglecting the concrete, in this case, the eccentric loading will again develop torsion..If the concrete s cast without PE board, the top portion will crack and the bottom portion and cross rebar will carry the shear and torsion will develop again..In order to reduce the torsional effect, the hinge shall be provided at the side face of the supporting beam.
I remember, in past, bridge piers were constructed with concrete hinges (Freysinnet hinge, Mesnager hinge...). Old , left technology .
The following links are useful to see the concept.

https://www.researchgate.net/publication/276089627_Concrete_hinges_in_bridge_engineering

https://www.ideals.illinois.edu/bit...9/engineeringexperv00000i00322.pdf?sequence=3

 

[molibden]

Wow, this does look wrong.

 

[r13]

It is a hinge. The problem is, it is potentially in the 3-hinge situation, as the transvers support beams rotate.

 

[molibden]

Well, I see a bit of a cantilever out of the main beam, so there is extra eccentricity. Why would you want that if you want a hinge? Probably constructability issue.

Also three bars at 45 deg. angle will transfer whole shear force there?

 

[bridgebuster]

If someone here reads Arabic it would shed light on the situation.

Definitely a hinge; perhaps there is a seismic reason?

 

[Myo Maung]

Can check with google translate. The link below is useful to translate any language to english.

https://www.google.com/search?q=tra...1.69i57j0l7.8895j0j8&sourceid=chrome&ie=UTF-8

 

[MIStructE_IRE]

Man that looks wrong. If anything, it almost looks like it would actually induce torsion into the primary beam since its effectively a stub cantilever off the primary which picks up the secondary at the hinge location thus resulting in a P-delta type situation....assuming of course it doesn’t fail in shear first!

Shudder!