The rigid arm CC is simply a statement that the "plane sections" hypothesis may be applied to the shear wall.

刚臂CC只是说明了在剪力墙中可以应用“平截面”假设。

youdao

The design of the roof is inspired by a Wellington aircraft and incorporates sections of aluminum recovered from a plane that was shot down over Belgium on May 12, 1944, killing its crew of eight.

WSJ: Bomber Command Memorial | They Were the Means of Victory | By Richard Holledge