Bridge Collapse

[yesman065]

I understand that - I was wildly speculating along with you. As a total aside - hat brought me to these train of thought was an old boat trailer I bought - I completely disassembled, had all the parts sandblasted and then reassembled. Err, tried to reassemble. There was so much damage to the steel that during the disassembly and sandblsting the pieces did not go back together properly. There were up to 1/4" gaps in some spots where there was supposed to be none. In fact, I had the whole thing galvanized and still had to insert some shims after that!