A historical vindication of the abrogation of the plan of union by the Presbyterian Church in the United States of America

The differences are quite telling. Figure 2-2-A Structural system for typical floor. The numbers in the figure denote: 13 — Perimeter frame 14 — Bar joists 900 mm deep 15 — Secondary joists 16 — Horizontal floor bracing 17 — Core box columns That the second floor plan is more accurate than the first, is plain from the above photo where the diagonal brace members (the V-shaped features in the diagrams) are clearly visible in the concrete along the north wall, but not along the west wall (as in the second diagram but not the first). Pairs of flat bars extended diagonally from the exterior wall to the top chord of adjacent trusses (this is puzzling, as the top chords of the trusses are set in the concrete slab, yet one can clearly see these bars on the concrete surface in the above mentioned photo). These diagonal flat bars, which were typically provided with shear studs, provided horizontal shear transfer between the floor slab and exterior wall, as well as out-of-plane bracing for perimeter columns not directly supporting floor trusses (Figure 2-2) ...»