# Simply supported beam with a truss

i am trying to find out the best way to approach a design task for a plane wing with a truss support. i am treating the wing as a simply supported beam but i have no idea how to incorporate the truss except as and extra support but i don't know whether this is suitable.

i am assuming it can be done via truss and member methods, this is the layout i am attempting

• So, will that truss be in tension or compression? Mar 22, 2022 at 13:24
• Your wing without the strut, would be a cantilevered beam not a simply supported beam. A simply supported beam, in my books implies a pin connection at one end and a roller connection at the other. What you are showing here and with what little I know about airframes, is more likely to be a fixed connection of the wing to the fuselage. I would guess that the strut to fuselage would also be fixed but could also be pinned. Same goes for your strut to wing connection. I highly suspect your wing would be considered a continuous beam over your strut connection. Mar 22, 2022 at 13:34
• the truss would be in compression, the beam could be cantilever or i could treat it as an overhang, its more whether the truss would effect the suport differently if i just treated the connection from it to the beam as a fixed support, also working out the reactions on the support its self
– Gman
Mar 22, 2022 at 16:56
• This is a simple static problem but it seems you don't know the fundamentals. I suggest hiring an engineer to help you to find the best support scenario, or ask your TA at school if you are a student.
– r13
Mar 22, 2022 at 19:14

$$M_{L2}=-WL_2^2/$$
$$M_{L1}= -WL_1^2/8+1/2M_{L2}$$ And the tensin in strut is
$$T=sec( a )*(1/2 \ W*L1+W*L2)$$