TIA-222-I §4.9 (LRFD). Leg splice: "flange" for a pipe / solid-round
leg (plate by the Annex Q yield-line method — no EN T-stub),
"leg_splice" for an angle/double-angle leg. Plus "diag_bracing" /
"horiz_bracing", "redundant_bracing" (a {"tag": {…}} map or one
flat spec), and "ubolt" (§4.9.11). Give bolts a
"bolt_grade" (A325 / A490 / F1554-…) — it resolves Fub at the
bolt's diameter per §4.9.1 — or a raw "bolt_fu"; one of the two is required.
"edge_type" is required with no default (sheared = 1.5 × bolt dia; everything
else follows AISC Table J3.4). A flange also needs "nc" or
"nc_basis" (Table Q-1 has no value below 8 bolts). Unknown keys are rejected
rather than ignored. Scaffold-grade — see the Connections tab notes in the report.
Two keys here also change MEMBER capacity, not just the joint.
"gc_mm" on a bracing block is §4.4.4.2's heel-to-bolt-group-centroid
distance: past the connected leg's centreline it multiplies that member's
compression resistance by b/(2·gc). Omit it and you get 1.0 —
the clause's own normal-framing default, not a guess — and the report says
"normal framing assumed". Waived anyway for a connected leg ≤ 76 mm [3 in.]
or L/r > 120. "both_legs_connected" on "leg_splice" raises the
§4.6.3.2(5) shear-lag factor from U = 0.80 to 1.00 — declare it only if the
splice really grips both angle legs.
It lives here rather than on the member because gc is a property of the
bolt group: two declarations of one detail is how the member and connection
layers once reported different numbers for the same splice.
Leg splice: "flange" for a pipe (CHS) leg (ring-flange + bolt prying),
"leg_splice" for an angle/double-angle leg (bolted cover-plate splice,
"n_shear_planes" 1 or 2, default 2 — use the one matching this section's leg
type, not both). With "both_legs_connected": true, "n_bolts_line" is
the bolts in EACH leg (two bolt lines).
"edge_type" (sheared / rolled …) is required for the end distance; an optional
"side_edge_type" sets the edge the edge distance is measured to, when it is
made differently (an angle's toe is a rolled edge).
Plus bolted shear connections for diagonals/struts, and
"redundant_bracing" for the redundant members — either a
{"tag": {…}} map giving each redundant tag (r1, r2, …) its own bolt
detailing, or a single flat spec shared by every tag. Scaffold-grade — see
Connections tab notes in the report. Edit as raw JSON; leave a sub-key out to
skip that connection, or leave a tag out of the map to leave it undetailed.
Bolt strength: give each entry a "bolt_grade" — the IS 800 Table 1
property class, e.g. "8.8" — and the bolt's ultimate and yield strengths are
read at its diameter (class 8.8 is 800 / 640 MPa up to 16 mm and 830 / 660 MPa
above). Classes 4.6 to 12.9 are accepted. You may give "fub_bolt" (and
"fyb_bolt") instead, but not both ways at once. With neither, 800 MPa is
assumed and the report says so.
These entries also drive the MEMBER tension check (IS 17740 Cl. 11.1): the bolt
line of a bracing or leg-splice entry — "d_hole", "n_bolts_line",
"pitch", "end_dist", "edge_dist" — is read as the holes in the
member for net-section rupture and block shear (IS 800 Cl. 6.3, 6.4). For a welded
end write {"welded": true}. An angle "leg_splice" must state
"both_legs_connected": true or false. A member with no entry is checked on
gross yield only and the report says its net section and block shear were not checked.
One key here also changes MEMBER compression capacity. "gc_mm" on a bracing
block is IS 17740 Cl. 10.4.4.2's g — the distance in mm from the heel of a
single angle to the centroid of its bolt or weld group. Past the centreline of
the connected leg it multiplies that member's compression resistance by
b/2g. Leave the key out for normal framing (factor 1.0); do not enter 0. A block holding only "gc_mm" is accepted and gets no connection check.
Not applied when the connected leg is 75 mm or less or L/r > 120.
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