diff --git a/src/main.ts b/src/main.ts
index bd67b13..f801ae0 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -118,8 +118,8 @@ const state = {
   stage: 'shape' as Stage,
   /** ③ 공통 설정 (fck · fy). */
   material: { ...DEFAULT_MATERIAL } as Material,
-  /** ② 부재별 fck. A member without an entry uses the 공통 fck (③). */
-  fckByMember: {} as FckByMember,
+  /** ② 부재별 fck. A member without an entry uses the 공통 fck (③). Initial values from 교각도 (025·026, 승인 2026-10-27): 기둥·코핑 40, 기초 27. */
+  fckByMember: { column: 40, coping: 40, footing: 27 } as FckByMember,
   /** Bar highlighted on ③ after [보기] (시안 ③ 알림). */
   /** Bars selected on ③ (철근표 checkboxes, 3D click, [보기]). */
   rebarSelection: new Set<string>(),