The major disadvantage of wood is the coefficient (modulus) of elasticity. One way to mitigate this disadvantage is hybridisation of some areas from the structural elements through the use of strips, made of composite multi-layers. The effectiveness of this method is measured by the difference between the displacements of the un-hybridised elements and those who are hybridised. Finding the displacements for elements with hybrid zones, elements with by-steps inertia moments, is the subject of this paper. The analysed elements are wood beams belonging to a spatial framework (SF) with continuity in nodes. Three cases are highlighted by the upgrade of beams through hybridisation over large areas with multi-layers made up of composite lamellas with unidirectional reinforcement. For the three cases, we determine the expressions of the displacements at the middle of the opening. Expressions of displacements are a quick pre-dimensioning of elements from a timber spatial framework with continuity in nodes and wood beams with hybrid areas.
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