Dear Francisco,

I found all the explanations you mentioned. However ,i need more elaborations regarding the takeover process of an off-shore wind farm.

Molla K

]]>Should we immediately change the material of the wind turbine pad and compact the new one with a smooth roller before a new test? ]]>

Thanks

]]>Dear Alejo

First of all, thanks for your feedback.

What you mention in your email is basically what the article is about. As under ULS (extreme factored loads) there is always uplift, Petersen approach assumes that all the load goes to the bolt, as you said, M/W-P/A, without any pretension stress previously applied to bolts. This assumption is a simplification and is not physically correct, the problem as I explain in the article is that to calculate the real tension force in the bolts when the uplift occurs you need to consider the overall equilibrium of the section and the variable stiffness of the system, something that is not so simple....

Best regards.

Jose

Interesting, I have started design of this anchor cages and I follow a method of the stiffness ratio between bolt and concrete, that is usually between 7 and 12 % meaning that I give, lets round in 10% of stiffnes ratio, of loads to the bolts and the rest to concrete in the compression side. What called my attention is that in tension side they say that were there is no uplift the force in the bolt will be (Stress in bolts due to pretension + (+M/W-P/A)*Stiffnes factor) that make sense because 90% of the load is working to de-compress the concrete previously compressed but for ULS moment there is always uplift and the max tension stress in bolts is M/W-P/A, without any pretension stress previosly applied to bolts. That is something that I cannot figure it out yet, do you think it the same way?. Great content by the way

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