Dear Mr Massabie:

I am TOTALLY AGREE with you, in everything you have mentioned.

Although I am still thinking that the strict calculation must be done with the correspondant
Sh, any engineer would be quiet if he is on behalf of safety. But referring to Mr Liang-Chuan Peng, at what point can go the safety factor against what economically can mean the excedent of such safety?

A teacher at my university said "If an engineer takes too much factors of safety in his calculations, perhaps, this factor of safety is due to his own unsafety".
I say that safety is a very important factor but the economical to assure you such safety it is also important.

Thank you very much for your comments.
Best Regards.