Truss Top Chord Lateral Support 1

[hoshang]

Hi all,
For a Pratt truss, lateral support is provided by a transverse U-frame consisting of the floor beam and truss verticals. What about a Warren truss? It doesn't have verticals.

 

[hoshang]

Hi BA,
I meant can points A and B in this image be considered as support points?

or these points (my A and B) can be assumed as one point so that there would be 3 points of support: one at each end and one at the middle so it can mimic the analysis model (a two-span truss supported by three points)?

 

[BAretired]

Your points A and B are necessary supports. So there are four supports in total.

The middle truss acts like a doubly cantilevered beam with a truss reaction R at the end of each cantilever. See below.

 

[hoshang]

Hi BA,
My thought is this

analytically maybe represented by this for simplicity (i.e., two hinges and two rollers):

Am I right?
My query is what would mimic this (i.e., two rollers and one hinge):