Adittional and Importantl Information:

[Francisco Fernando Quintanilha]

Friends,

 

I need some rest but I must inform it. Remember about the rates weight of reinforcemt/m³ of concrete I gave to you?

 

 Well, I warned that it should be checked. Now reading more carefully the text about N’kossa barge, I found it 3 times what I had given to you. !!!!

 

It is for sure a total, full, prestressed structure, for avoiding cracking and to assure durability and extra strength.

 

See:

 

“The especially high density of the non-stressed and prestressed reinforcements respectively (200 kg/m³ and 100 kg/m³) made the positioning and installation of the PT ducts an especially delicate operation.”

 

I had told you:

 

         Reinforcement rate: in kgf or Kn per cubic meter of concrete

 

-         Prestressing cables fyk = 1900 Mpa; 20 kgf/ m³; 0.20 KN/m

 

-         Rebar fyk= 450 Mpa; 80kgf/m³; 0.78 KN/m³

 

But it fits just for buildings and bridges in Brazil, which have no earthquake assumptions, and not so large temperature gaps and mainly cause, even in bridges, an economical design approach is used, and thus allowing some cracking.

 

So, in fact we have more information than sometimes we think.

 

Regards

 

Fernando

 

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