Q... had all the permit papers? Hmmmm... it will get sorted and, hopefully, the error won't be repeated.

And, just for interest sake re the comment that the steel looked "light". Sand will bear a lot of weight but a child can scoop it up with it's fingers. You are looking at a truss which was not designed to bear a compression with one member but a truss that was designed to engage and bear the load by the members in tension within the truss.

If we could build the tension members of a truss with spider silk, we could build a stairway to heaven. As it is, we have to be satisfied with 80,000 psi tension stength steel.

Here is the ultimate demonstration of the simplest engineering observation made by humans to date (and employed in simple truss design, among many designs). What is easier?... push a piece of string or pull a piece of string? In either case, if you drive over the string with a truck... yer trucked.