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GB 50017 轴心受压构件稳定Axially Compressed Steel Member

附录 D 稳定系数 φ（a/b/c/d 类）· 式 7.2.1 N/(φAf) ≤ 1.0 · 长细比限值 / Appendix D buckling coefficient, member check, slenderness limit

⚠ 测试版 —— 使用前必须核对 / BETA — verify before use

附录 D 公式与 a、b、c 类系数已与 Bentley STAAD.Pro 验证算例及已发表的表 D.0.2 数据核对；d 类系数仅经连续性内部校核（置信度 B）；除 Q235（t ≤ 16 mm）外的强度设计值为置信度 B，可直接输入 f。
Formula and the a/b/c coefficients are checked against Bentley STAAD.Pro verification examples and a published row of Table D.0.2; curve d rests on internal consistency only. Design strengths other than Q235 (t ≤ 16 mm) are confidence B — you may enter f directly. Not checked against the official GB text.

输入参数 / Inputs

钢材 / Steel

最大板厚 t (mm)

f (MPa, 空 = 查表)

A (mm²)

i_x (mm)

i_y (mm)

l_0x (mm)

l_0y (mm)

λ_yz 换算长细比 (§7.2.2) — 单轴对称截面必填 / required for angles, T, channels

截面类型 / Section type (表 7.2.1-1)

b/h（轧制 H）

截面类别 x / class x

截面类别 y / class y

N (kN)

容许长细比 / λ limit

φ 取值 / φ from

结果 / Results

来源 / Sources

GB 50017-2017 §7.2.1、§7.4.6、附录 D（D.0.1–D.0.5）、表 4.4.1 —— 仅引用条文号。截面类别按表 7.2.1-1（t < 40 mm）/ 表 7.2.1-2（t ≥ 40 mm）由用户选择。Findings while verifying: the published tables reproduce exactly when π is taken as 3.14 (one full row of Table D.0.2 checked, 10/10); Bentley's H-section verification example prints α₂ = 1.126 for curve c — a misprint (the curve would jump by 0.028 at λ_n = 1.05; the correct 1.216 is continuous). Defaults: Bentley's single-angle verification example — λ_x = 76.93 → φ = 0.708, and the flexural-torsional λ_yz = 130.7 → φ = 0.384 governs. For singly symmetric or asymmetric sections (angles, T, channels) the flexural slenderness alone is unconservative: compute λ_yz per §7.2.2 and enter it; this tool does not compute λ_yz itself.