I know there are a lot of questions on here questioning the weight bearing capabilities of dimensional lumber but this seems like such a specific scenario since the load is static and completely even.
This is a stand made entirely of 2x6 SPF lumber to support two 55 gallon aquariums right next to each other. The span from leg to leg is 10ft. There is are 4 through bolts connecting the horizontal beams to the legs. The spans are connected in the middle by short sections of 2x6 which are also there to support the short edge of the tank.
Each tank when fully loaded is 500lbs or more. From what I have been seeing this shelf is not strong enough but nothing quite matches the scenario. Here are 2 photos of the shelf:
Will this be able to support another 55g across the ten foot beam? Of not, would adding a middle support to cut the beam length in half help?
If there are 2 beams and the aquarium sits on both, does that mean each beam takes half the weight of the aquarium. For example in this case there are 2 beams supporting the bottom of the tank, does that mean, if the tank were 500lbs, that each beam is supporting 250lbs?