Strong building

A building that satisfies the latest California building code (the strictest in the world).

Also, a nuclear blast resistant building (that's real strong).

Most related terms would be from military applications:

Fortification, fortress, citadel, or (also used metaphorically) bastion (from the invincible Bastille in France).

If the building is underground, then it would be a bunker.

Adjectives: fortified or hardened buildings.

I think I couldent explain what I had in mind.
Actually the word I mean is something which is usually used by architects and can be used for anything which is build by them like buildings, bridges, towers, or etc.
The thing I am talking about is something that is forified and is made of cement, steel beams, ...
I don't know if i am clear or not

OK, there is not any specific name for a general-purpose finished building except the military type terms in my prior post.

You can use words that pertain to either the material being used ( reinforced concrete, hardened structural steel), or, refer to specific building standards and codes that were used in its design and construction. Here are the American standards for steel constructi

thank you so much both for your answers and the links

Maybe, redundant design, or over-design.

That is a strong building