I have no idea how you could reinforce this, other than using similar wide metal pieces, placing one over and the other under the main rod and screwing them together by means of nuts and bolts. If this is the place where the joints bend, than it will be difficult to fix it in such a manner that it can still open and close properly.
I would measure the piece and make a template. With that I would go to the hard ware store and see what options there are.
I am sorry that I can't be of more help.
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