The Impact of Using Concrete of Various Density on the State of Stresses in Prestressed Concrete Flyovers Over Highways

A significant part of flyovers over highways and express roads in Poland is developed as two-span beam and frame structures. Due to the span length and economic conditions their superstructure are most often constructed as prestressed concrete ones. This paper presents the impact of some of the construction defects and imperfections not considered during the design stage on the stress state in the post-tensioned flyovers structures over highways. The results of the analyses concern three structures that were inspected in detail by the authors.