From 773bdd8164dacc9ce9e3bb30470bbb7734dc1983 Mon Sep 17 00:00:00 2001
From: st_func <st_func@outlook.jp>
Date: Mon, 12 Feb 2024 18:07:17 +0900
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---
 src/constant.ts                  |  6 ++++++
 src/sec/build-h-function.test.ts | 11 +++++++++++
 src/sec/build-h-function.ts      |  5 +++++
 src/sec/steel-function.test.ts   |  5 +++++
 src/sec/steel-function.ts        | 14 ++++++++++++++
 5 files changed, 41 insertions(+)
 create mode 100644 src/sec/steel-function.test.ts
 create mode 100644 src/sec/steel-function.ts

diff --git a/src/constant.ts b/src/constant.ts
index 3943702..1daebcc 100644
--- a/src/constant.ts
+++ b/src/constant.ts
@@ -1,8 +1,14 @@
+/**
+ * 鋼材の密度(kg/m^3)
+ */
+export const STEEL_DENSITY: number = 7850.0;
+
 /**
  * 断面性能のタイプ
  */
 export const enum SectionPropertyType {
   Area = "断面積",
+  MassPerMetre = "単位質量",
   SecondMomentOfAreaY = "断面二次モーメントY",
   SecondMomentOfAreaZ = "断面二次モーメントZ",
 }
diff --git a/src/sec/build-h-function.test.ts b/src/sec/build-h-function.test.ts
index 9d88cfb..e9422ed 100644
--- a/src/sec/build-h-function.test.ts
+++ b/src/sec/build-h-function.test.ts
@@ -13,6 +13,17 @@ test("ビルドHのA", () => {
   );
 });
 
+test("ビルドHの単位質量", () => {
+  const H = 1.2;
+  const B = 0.4;
+  const T1 = 0.019;
+  const T2 = 0.025;
+  const M = 328.5225;
+  expect(
+    SecBuildHFunction.buildH(SectionPropertyType.MassPerMetre, H, B, T1, T2)
+  ).toBe(M);
+});
+
 test("ビルドHのIy", () => {
   const H = 1.2;
   const B = 0.4;
diff --git a/src/sec/build-h-function.ts b/src/sec/build-h-function.ts
index 09f5c5b..c798fea 100644
--- a/src/sec/build-h-function.ts
+++ b/src/sec/build-h-function.ts
@@ -1,4 +1,5 @@
 import { SectionPropertyType } from "../constant";
+import { SecSteelFunction } from "./steel-function";
 /**
  * 組立H形鋼の断面性能を計算する関数集
  */
@@ -65,6 +66,10 @@ export class SecBuildHFunction {
     switch (propertyType) {
       case SectionPropertyType.Area:
         return SecBuildHFunction.buildHArea(a, b, t1, t2);
+      case SectionPropertyType.MassPerMetre:
+        return SecSteelFunction.massPerMetre(
+          SecBuildHFunction.buildHArea(a, b, t1, t2)
+        );
       case SectionPropertyType.SecondMomentOfAreaY:
         return SecBuildHFunction.buildHSecondMomentOfAreaY(a, b, t1, t2);
       case SectionPropertyType.SecondMomentOfAreaZ:
diff --git a/src/sec/steel-function.test.ts b/src/sec/steel-function.test.ts
new file mode 100644
index 0000000..a676a65
--- /dev/null
+++ b/src/sec/steel-function.test.ts
@@ -0,0 +1,5 @@
+import { SecSteelFunction } from "./steel-function";
+
+test("鉄骨の単位質量", () => {
+  expect(SecSteelFunction.massPerMetre(10.0)).toBe(78500.0);
+});
diff --git a/src/sec/steel-function.ts b/src/sec/steel-function.ts
new file mode 100644
index 0000000..9e195f1
--- /dev/null
+++ b/src/sec/steel-function.ts
@@ -0,0 +1,14 @@
+import { STEEL_DENSITY } from "../constant";
+/**
+ * 鉄骨断面に関する関数
+ */
+export class SecSteelFunction {
+  /**
+   * 単位質量
+   * @param area 断面積
+   * @returns 単位質量
+   */
+  static massPerMetre(area: number): number {
+    return STEEL_DENSITY * area;
+  }
+}