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A structure is analyzed compliant with respective building standards. These standards were developed from research and development and contain the knowledge at the time of its implementation. Standards are not carved in stone. They develope over the years as the knowledge about in this case concrete gets better. During my career I learned to work with 4 generations of concrete standards. All steps allowed a better utilization of concrete. Sometimes innovative developments like high performance concrete get standardized. And if you find weak points, mostly durabilty, you have to correct the standard. The influence of road de-icing salt on concrete in parking garages was underestimited till the end of the 1980s. But I can't remember a change necessary because of a reduced safety. And then there is the human factor. So yes, if done correctly a structure is safe and that isn't an opinion. Regards, Volker
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