Revert "feat(rebar): B1–B4와 B5–B8 방향 교환 (B1–B4는 W 방향, B5–B8은 L 방향)"

이 교환은 9,350 방향이 L이라는 가정에서 적용됐으나, 단면 삽도(B5–B8 선, 교각축 직각 단면)와 재료표가 원래 배치(B1–B4 L 방향, B5–B8 W 방향)와 맞는 것으로 확인되어 되돌림.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

src/core/rebar/footing.ts

@@ -23,7 +23,7 @@ export interface GridResult {
 }
 
 /** Grid along one side of the footing (§3.1). side = W for B1–B4, L for B5–B8. */
-export function grid(side: number, f: FootingRebarSettings = DEFAULT_FOOTING_REBAR, key: FootingGridKey = 'sL'): GridResult {
+export function grid(side: number, f: FootingRebarSettings = DEFAULT_FOOTING_REBAR, key: FootingGridKey = 'sAxis'): GridResult {
   const s = f[key];
   const A = side - 2 * f.cSide;
   const n = Math.floor((A - 2 * f.eMin) / s);
@@ -70,13 +70,13 @@ export interface FootingBar {
   length: number;
 }
 
-/** B1–B4 (승인 2026-10-26, 방향 교환): run along W, spaced along L (grid L, sL), with lengths from W. */
+/** B1–B4 (§5): the grid along W, with lengths from L. */
 export function bottomBars(L: number, W: number, H: number, f: FootingRebarSettings = DEFAULT_FOOTING_REBAR): FootingBar[] {
-  const g = grid(L, f, 'sL');
+  const g = grid(W, f);
   const n = g.positions;
   const N4 = Math.ceil(n / 2); // B4 at even i
   const N2 = Math.floor(n / 2); // B2 at odd i
-  const l0 = W - 2 * f.cSide;
+  const l0 = L - 2 * f.cSide;
   const leg2 = legB2(H, f);
   return [
     { name: 'B1', size: 'S25', count: N2, length: l0 + 2 * legLength('S25') },
@@ -86,13 +86,13 @@ export function bottomBars(L: number, W: number, H: number, f: FootingRebarSetti
   ];
 }
 
-/** B5–B8 (승인 2026-10-26, 방향 교환): run along L, spaced along W (grid W, sW), with lengths from L. */
+/** B5–B8 (§6): the grid along L, with lengths from W. */
 export function crossBars(L: number, W: number, H: number, f: FootingRebarSettings = DEFAULT_FOOTING_REBAR): FootingBar[] {
-  const g = grid(W, f, 'sW');
+  const g = grid(L, f, 'sPerp');
   const n = g.positions;
   const N8 = Math.ceil(n / 2); // B8 at even i
   const N6 = Math.floor(n / 2); // B6, B5, B7 at odd i
-  const l0 = L - 2 * f.cSide;
+  const l0 = W - 2 * f.cSide;
   const z = layers(H, f);
   const leg6 = z.B5 - z.B68;
   return [
@@ -172,9 +172,9 @@ export function assemblyGridIndices(n: number, k: number, idx: number): number[]
 
 export function assemblyBars(L: number, W: number, H: number, f: FootingRebarSettings = DEFAULT_FOOTING_REBAR): FootingBar[] {
   const levelsJ = assemblyJs(H, f);
-  // B11 is spread along L (grid L, sL) and B12 along W (grid W, sW), per 확대기초철근 (1).md §8 (after the 방향 교환).
-  const nW = grid(W, f, 'sW').positions - 1;
-  const nL = grid(L, f, 'sL').positions - 1;
+  // B11 is spread along L (교각축 직각 grid) and B12 along W (교각축 grid), per 확대기초철근 (1).md §8.
+  const nW = grid(W, f, 'sAxis').positions - 1;
+  const nL = grid(L, f, 'sPerp').positions - 1;
   const b11 = levelsJ.reduce((a, _, idx) => a + assemblyGridIndices(nL, f.kB11, idx).length, 0);
   const b12 = levelsJ.reduce((a, _, idx) => a + assemblyGridIndices(nW, f.kB12, idx).length, 0);
   const hook = Math.round(hookLength('main90', d('S16'))); // 246 mm, rounded as in the document (§8.3)
@@ -187,7 +187,7 @@ export function assemblyBars(L: number, W: number, H: number, f: FootingRebarSet
 }
 
 /** Plane positions of the grid along one side, mm from the footing centre: x_i = −side/2 + c_s + e + i·s (§3.1). */
-export function gridPositions(side: number, f: FootingRebarSettings = DEFAULT_FOOTING_REBAR, key: FootingGridKey = 'sL'): number[] {
+export function gridPositions(side: number, f: FootingRebarSettings = DEFAULT_FOOTING_REBAR, key: FootingGridKey = 'sAxis'): number[] {
   const g = grid(side, f, key);
   return Array.from({ length: g.positions }, (_, i) => -side / 2 + f.cSide + g.e + i * f[key]);
 }
@@ -204,9 +204,8 @@ export interface B9Bar {
  * than the column radius plus half a bar to a column axis (Q-B20, applied: the 기둥 구역 is removed).
  */
 export function b9Bars(L: number, W: number, columnX: number[], columnD: number = 2000, f: FootingRebarSettings = DEFAULT_FOOTING_REBAR): { rows: number; perRow: number[]; bars: B9Bar[] } {
-  // B9: columns along L use the L grid (sL); rows along W use the W grid (sW) (방향 교환 후 물리적 격자, 승인 2026-10-26).
-  const xs = gridPositions(L, f, 'sL');
-  const ns = gridPositions(W, f, 'sW');
+  const xs = gridPositions(L, f);
+  const ns = gridPositions(W, f);
   const rowIndices: number[] = [];
   for (let i = 1; i < ns.length; i += 4) rowIndices.push(i);
   const halfBar = NOMINAL_DIAMETER.H16 / 2;
@@ -266,8 +265,8 @@ export function assemblyHeights(H: number, f: FootingRebarSettings = DEFAULT_FOO
  * rebar table and the 3D view use, so the panel cannot drift from the calculation. H is the footing height (mm).
  */
 export function footingRuleValues(H: number, f: FootingRebarSettings = DEFAULT_FOOTING_REBAR): {
-  upper2L: number;
-  upper2W: number;
+  upper2sAxis: number;
+  upper2sPerp: number;
   delta2: number;
   b2Leg: number;
   b6Leg: number;
@@ -280,15 +279,15 @@ export function footingRuleValues(H: number, f: FootingRebarSettings = DEFAULT_F
 } {
   const z = layers(H, f);
   return {
-    upper2L: 2 * f.sL,
-    upper2W: 2 * f.sW,
+    upper2sAxis: 2 * f.sAxis,
+    upper2sPerp: 2 * f.sPerp,
     delta2: DELTA2,
     b2Leg: legB2(H, f),
     b6Leg: z.B5 - z.B68,
-    b9Pitch: 4 * f.sL,
-    b9Stagger: 2 * f.sL,
-    b11Pitch: f.kB11 * f.sL,
-    b12Pitch: f.kB12 * f.sW,
+    b9Pitch: 4 * f.sAxis,
+    b9Stagger: 2 * f.sAxis,
+    b11Pitch: f.kB11 * f.sPerp,
+    b12Pitch: f.kB12 * f.sAxis,
     assemblyVertical: f.n * f.sV,
     assemblyLevels: assemblyJs(H, f).length,
   };