Files
Pier_v1/src/core/rebar/coping.ts
T
ypshimandClaude Haiku 5.5 5641bbe265 feat(core): lengths for coping, column and the B2 split (추천안)
- Coping: C9/C10 lower U = 1740 + 2h with h linear along the slope and 2300 on
  the Level (3522 / 6098 / 6249 / 6340 from the document); C12 (3717–10183),
  C13 11746, C14 3447.5, C15 3852, C16 4070.
- Column: P3 = C_t + 1.3·l_d(H19) lap (추천안 for Q-C6, lap 1146.6), P5 = C_t.
- Footing: B2 13646 is split into two pieces at a splice with 1.3·l_d(S25,
  SD500) (추천안 for Q-B6), piece ≈ 7776 each.
- Not done: C9/C11 cap (삿갓) lengths (Q-K5 open), P1/P2 per-line pieces.
- Tests against the document values; P1 summary updated.
- Not verified in a browser.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
2026-10-22 11:37:08 +09:00

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/**
* 코핑 철근 (plan C3). Source: RAG/코핑철근.md, 2026-10-22 최종 정리 (spec §6.4 is older and is not used here).
* Positions are along the coping length from its start, in mm.
*/
export const COPING_REBAR = {
/** 피복 (최외측 철근 중심까지). */
cover: 100,
/** 첫 전단철근 최소 여유 e_add. 끝 여유 e_min = cover + e_add = 300. */
eAdd: 200,
/** Level 폭 W_L. */
levelWidth: 2100,
/** C10 간격 s_L (기둥 중심부터). */
spacingL: 300,
/** C9·C11 간격 s_s (C10에서 바깥으로). */
spacingS: 250,
/** C12·C13 측면 수평 간격. */
spacingSide: 250,
/** C14 위 2줄 간격 / 아래 줄 수평 간격 / 아래 줄 연직 간격 / 끝 여유. */
c14: { upperSpacing: 1000, lowerSpacing: 2000, verticalSpacing: 500, endGap: 500 },
} as const;
export const COPING_END_GAP = COPING_REBAR.cover + COPING_REBAR.eAdd;
export interface ShearBars {
/** C10 positions (mm), from the first to the last. */
c10: number[];
/** C9 positions (mm), from the left end toward the column. */
c9: number[];
/** C11 positions (mm), from the column toward the right end. */
c11: number[];
/** Distance from the coping end to the outermost C9 / C11 bar (mm). */
endGap: number;
}
/**
* Shear bars C9–C11 along the axis (코핑철근.md §3). A single column at the coping centre.
* C10: @300 from the column centre, out to the first position beyond the Level edge (k_max).
* C9 / C11: @250 outward from the outermost C10, as many as fit with the end gap of at least 300.
*/
export function shearBars(coping: number, xc = coping / 2): ShearBars {
const { spacingL, spacingS, levelWidth } = COPING_REBAR;
const kMax = Math.floor(levelWidth / 2 / spacingL) + 1;
const c10 = Array.from({ length: 2 * kMax + 1 }, (_, i) => Math.round(xc + (i - kMax) * spacingL));
const left = c10[0];
const right = c10[c10.length - 1];
const n9 = Math.floor((left - COPING_END_GAP) / spacingS);
if (n9 < 0) {
throw new Error('RB-K01: C10 바깥 구간이 끝 여유보다 짧아 C9를 놓을 수 없습니다.');
}
const c9 = Array.from({ length: n9 }, (_, j) => Math.round(left - (n9 - j) * spacingS));
const c11 = Array.from({ length: n9 }, (_, j) => Math.round(right + (j + 1) * spacingS));
const endGap = Math.min(left - c9[0], coping - c11[c11.length - 1]);
return { c10, c9, c11, endGap: endGap };
}
/**
* Side horizontal bars (코핑철근.md §6): seven rows from the bottom at 250 mm.
* Rows below the sloped-bottom break (z_7,end) are C12, the rows at and above it are C13.
*/
export function sideRows(zBottom: number, zBreak: number, rows = 7): { c12: number[]; c13: number[] } {
const z = Array.from({ length: rows }, (_, i) => Math.round((zBottom + i * COPING_REBAR.spacingSide / 1000) * 1000) / 1000);
return { c12: z.filter((v) => v < zBreak - 1e-9), c13: z.filter((v) => v >= zBreak - 1e-9) };
}
/** C14 counts (코핑철근.md §8): 2 upper lines of 11 plus the lower rows 5 / 6 / 3 / 2 = 38. */
export const C14_COUNTS = { upperLines: 2, upperPerLine: 11, lower: [5, 6, 3, 2] as const };
export function c14Total(): number {
return C14_COUNTS.upperLines * C14_COUNTS.upperPerLine + C14_COUNTS.lower.reduce((a, b) => a + b, 0);
}
/** C15 (거꾸로 된 U, 가장 높은 계단) and C16 (L형, 2구간) counts (코핑철근.md §7). */
export const STEP_BAR_COUNTS = { C15: 11, C16: 22 } as const;
/**
* C9·C10 lower U length (코핑철근.md §4.3): 1740 + 2h. h rises linearly along the slope between the document's
* ends (x 300 → h 890.9, x 4550 → h 2178.8) and stays at the Level height 2300 from the Level edge (4950) on.
* The bar's upper cap (삿갓) length depends on l_cap, which is still open (Q-K5), so only the U is given here.
*/
export const SHEAR_U = { x0: 300, h0: 890.9, x1: 4550, h1: 2178.8, levelH: 2300, levelEdgeFromCentre: 1050, flat: 1740 } as const;
export function shearUHeight(x: number, coping: number): number {
const xs = Math.min(x, coping - x); // mirror to the left half
const slope = (SHEAR_U.h1 - SHEAR_U.h0) / (SHEAR_U.x1 - SHEAR_U.x0);
const h = SHEAR_U.h0 + (xs - SHEAR_U.x0) * slope;
return Math.min(h, SHEAR_U.levelH);
}
export function shearULength(x: number, coping: number): number {
return SHEAR_U.flat + 2 * shearUHeight(x, coping);
}
/** C12 straight lengths per row (코핑철근.md §6 table, mm) and C13. */
export const SIDE_LENGTHS = { C12: [3717, 5333, 6950, 8567, 10183], C13: 11746 } as const;
/** C15 (거꾸로 된 U, 3852) and C16 (L형, 4070 / 4069) lengths, mm (코핑철근.md §7). */
export const STEP_LENGTHS = { C15: 3852, C16: [4070, 4069] as const, C14: 3447.5 } as const;