drop wall concrete below beam

[lejam]

In a beam with vertical dawel at the bottom spaced every 1 foot to attach concrete 0.1 width by 0.3 depth or drop wall to put windows, can the concrete attachment or addition affect the shear or moment behavior of the beam? But this is commonly done to accomodate windows or doors undeneath beams which are too high.

 

[hokie66]

Not sure how you would cast a 100 wide drop below an already cast beam. 100 wide concrete sections are not in my vocabulary. Why isn't this done in the facade framing?

 

[dhengr]

lejam:
It seems to me that some of you guys should take a few basic college courses in engineering, and then a course or two in concrete design and construction. That does seem to be your construction material of choice. But, at the moment, a number of you guys know just enough about concrete to be really dangerous. If the shoe fits, wear it, and get it fixed.

 

[lejam]

Please check file attachment, I saw this in a construction across the street. It's in a second floor, the temperered glass window is about 2.4 meter in height. The beam is 2.7 meter high. So they put concrete between it with existing dawel in the beams supporting the concrete. Is this not done elsewhere? Why? What would you put between the beam and windows then?

 

[hokie66]

If the beam is only 200 wide, why wouldn't you cast it to the depth required rather than try to come back and retrofit something later? I don't know how you would "put concrete between". The normal course of events would be to use braced steel framing for the head, or else carry the window mullions up, with infill panels for the 300 high head section.

 

[lejam]

Please see the attached actual picture of how the concrete is put between or underneath the front store second floor 0.2x0.4m beam. Would it affect beam behavior? How?

What do you mean by braced steel framing to carry the "window mullions up", with "infill panels" for the 300 high head section? Any illustratin of this "infill panels"? But the braced steel would add weight similar to the concrete. You didn't want concrete put underneath beam maybe because it adds weight. Now you want to add steel brace which is as heavy? What is commonly done to frame windows that are 2.4 meter height versus the beam 2.7 meter height.

 

[hokie66]

Nothing to do with weight, and the steel and infill material would not be nearly so heavy as the concrete.

Ways of dealing with the head section would vary from location to location around the world. I was just giving you a description of what I would do, in Australia. Where are you located?