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freebutterflyx

How was old structure calculated?

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I need to check an existing structure.

The structure is

- 50 years old

- concrete beam/column/slab structure

- reinforcement is known (ferroscan and destructive check)

 

First I want to check the floor slab = continious slab of spans 2.7m.

According a calculation with current EC , the floor is not OK. (taking a variable load of 200kg/m² and EC safety coeff)

When I don't use any safety coeff. and the load of 200kg/m², then the slab is OK. 

 

Would anyone know how a construction at that time was calculated?

 

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That structure was almost certainly calculated with allowable stress design method. You should check in old national code what were allowable stresses for particular concrete class and then check the slab with that parameter. I think you checked the slab with no safety coefficient but used full fcd value that can only be applied for limit state design.

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Check it with limit states design... there is usually an improvement in strength over ASD.  Does the Eurocode allow you to restrict a loading for an area if it's not up to strength?  Does the Eurocode have provision for renovation of existing structures.

 

Dik

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