Fig 3-18 Interaction of vertical and horizontal subsystem of tube structure TOTAL SYSTEM: SHEAR TRANSFERRED BENDING STRESSES IN BENDING STRESSES IN 4 VERTICAL PLANES BY PLANES WHICH ARE SHEAR RESISTING PLANES TOTAL SYSTEM(TRANSVERSE JOINED AT CORNERS PARALLEL TO (H) PLANES ACT BECAUSE AND ONE HORIZONTAL JOINED TO SHEAR PLANES) PLANE CLOSING TOP (oc TENDENCY TO BUCKLEFig 3-18 Interaction of vertical and horizontal subsystem of tube structure