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Reinforced Concrete Joint Condition

Reinforced Concrete Joint Condition

Reinforced Concrete Joint Condition

I have encountered some books emphasizing that there is no fully-fixed or hinged joint conditions in reinforced concrete. On the other hand, steel structures may give us better understanding through joint connections (bolting and/or welding).
I am aware that RC joint condition has something to do with assumptions during analysis and detailing of rebars. But may I have more insights to better address this confusion.

Thank you.

RE: Reinforced Concrete Joint Condition

It's more difficult with concrete, but you can develop a better degree of fixity than many take advantage of. It depends to some extent on the manner of construction. If, for example, you have an elevator shaft with right angle walls, with a slab attached to the walls, and the construction sequence is that the slab is cast over the concrete wall and a keyway is not used and the next elevator wall is cast over the concrete slab 'pinching' the slab between the walls, I would treat the slab as being nearly 'perfectly' fixed at the wall. If you have a concrete beam cast into a wall and you can develop the reinforcing, then as long as the beam is shallow compared to the wall, I would normally consider that as being fixed... but, depending on circumstances, may add a little more bottom steel to the beam...


RE: Reinforced Concrete Joint Condition

Thank you Dik for bringing your actual experience to explain this confusion. I definitely agree that slabs and beams cast monotonically with reinforced walls shall be assumed fully fixed to supports (walls).
How about [1] beams/girders cast monotonically with columns (given that they are part of moment resisting frames) and [2] moment resisting columns with their supporting footings?

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