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For multi-story concrete civil structures, the weight of the floors usually represents approximately 60% of the weight of the superstructure. For this reason, reducing the weight of the floors becomes important both for reducing the inertial mass of the structure and for reducing the reactive pressure of the ground on which the infrastructure rests. To optimize the thickness of the slabs, this article proposes a method based on modal analysis that allows establishing the thickness of the slabs by limiting the eigenvalue (period) in mode 1 at T = 0.2 s. [ABSTRACT FROM AUTHOR]

Both the literature and all the historical vestiges that we find today in the world, highlight the fact that over the centuries there has been a continuous transfer of knowledge from the Romans to the other peoples occupied by them. Roman culture was advanced at that time; we can remember that they loved music, theatre, architecture, construction, politics, astronomy, etc. This process also occurred in Dacia (part of today's Romania) marked by military conquest campaigns. The Danube River was and still is a natural obstacle that requires large-scale engineering works for its crossing. His crossing on the territory of our country was made through two bridges (the bridge of Trajan and the bridge of Constantine the Great). Of the two bridges, today we find only parts of the abutment, both on the Romanian and Bulgarian shores. Of course, the materials found in these sites have long been unknown in terms of durability over time. This river has always been a navigable communication route for an important part of Europe. But in order to connect the river and the fortresses / forts, roads have been built that we still find today. For example, in the Danube Boilers area we find parts of a mixed profile road, one part excavated in the rock and the other is made in the console. [ABSTRACT FROM AUTHOR]