long span concrete beams
long span concrete beams
(OP)
Hello
I was looking for some tips on designing large, long span concrete beams. ie 1000mm deep x 17m long.
Is the design process as simple as scaling up the design for 300mm deep x 6m long beams for example or is there additional items i need to consider?
I was looking for some tips on designing large, long span concrete beams. ie 1000mm deep x 17m long.
Is the design process as simple as scaling up the design for 300mm deep x 6m long beams for example or is there additional items i need to consider?






RE: long span concrete beams
The behavior only changes when you have a span to depth of about 4 or less (code definitions vary), it is then called a 'deep beam' and behaves quit differently (more like a strut and tie models). I dont know why they call it a deep beam as it is the span to depth that is important.
If it is an upstand beam then you may need to check the slenderness limit (yes there is usually on in the concrete codes).
RE: long span concrete beams
In the beams, you have to check for flexure and shear (both can be high) as well as deflection, cracking, vibration wasn't an issue. You also have to check for rebar placing because of congestion of bars at the columns. Beam to column fixity assumed to be monolythic and spread footing assumed to be rigid at base (good granular material). Effective EI for columns calculated taking into effect of crackingas well as stress level of concrete. Maximum reinforcing occurred at upper most column due to lack of vertical load.
Other than that, nothing out of the ordinary.
Dik
RE: long span concrete beams
RE: long span concrete beams