bridge, beam
樑 centers on a horizontal structural support: a beam in a building or a bridge spanning a gap. Both senses share the idea of a sturdy wooden member that bears weight across an opening.
樑 is a phono-semantic compound: 木 (tree/wood) provides the meaning of a wooden beam or bridge, while 梁 (リョウ) supplies the sound and also carries the core meaning of a beam or bridge. The character is essentially a reinforced variant of 梁.
The left side 木 (tree/wood) and the right side 梁 (beam/bridge) together picture a heavy wooden beam. Imagine a thick log laid across two supports to form a simple bridge.
For リョウ, picture a long wooden beam stretching across a river like a bridge, and think of the English word 'long' — the 'lo' sound is close to リョウ, and the beam is long enough to span the gap.