Heavy duty shelves are usually metal shelving that is used in storage rooms to hold heavier items such as boxes of books, tool chests, or equipment. These shelves need to be reinforced in order to hold the weight of the items without collapsing.nnThis can be done by adding braces to the shelves, which is usually done by welding or bolting the braces onto the shelves. The braces will add support to the shelves and help distribute the weight more evenly, preventing the shelves from sagging or collapsing. In some cases, the whole shelf may need to be replaced if it is not possible to reinforce it.