Subject: how much can concrete bend before it breaks

hello, can you work out how far concrete will bend before it cracks? is there a 

formula? eg. if I had a bridge across a creak 1m wide and 5m long (150mm thk)



how many people (100kg) can it take before it break (don't worry I'm not 

building a bridge ;) just thought that would b e a good example).  Then what 

would be the formula if I had reinforcement bars in the concrete. thanks it is 

very hard to get simple answer to this question. thanks roger.

Re: how much can concrete bend before it breaks