Photo Credit: Alex Mead
What you are looking at is the steel that is in all the reinforced concrete structures around you. The large number of bars that you see are meant to hold the tension force in the foundation of this underground parking structure. One of the main costs in reinforced concrete construction is the labor to place all the resteel where it is needed. As you can see from this photo the number of resteel bars is staggering. Rest assured though, each bar has its proper place calculated by a competent structural engineer!