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characteristic of center joint in horizontal x-brace

Syahzada

Structural
Joined
Aug 22, 2024
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6
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in horizontal x-bracing's central joint, what characteristic does it have in terms of its fixity? does it resist moment?
 
Ideally, x-braces are modelled as two independent members with no intersection (no node connecting all 4 'parts'). Having a node at the intersection can create instability due to load sharing among all 4 members.

[EDIT]:
I just realised I didn't answer the question. We typically consider them pinned and avoid having them resist moment to simplify calcs and detailing. Basically, have the behaviour as a truss consider purely axial forces and no bending (EA - stiffness)
 
Last edited:
but then those 4 nodes need to be connected together.

why not a common node ? yes, this would "weld" the joint ... so fully fixed if beams model the cross bracing (or pinned if rods). no?
 

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