Specification for Structural Steel Buildings ANSI/AISC 360-22 PDF Download
AISC 360-22 是美国钢结构设计与施工领域最具权威性的国家标准之一，全称为 **ANSI/AISC 360-22《钢结构建筑规范》（Specification for Structural Steel Buildings）**，由美国钢结构协会（AISC）与美国国家标准学会（ANSI）联合发布，2022 年编制，2023 年 1 月 31 日正式实施，替代上一版 AISC 360-16。
### 一、适用范围
规范适用于工业与民用建筑、大跨度空间结构、钢-混凝土组合构件等以钢材为主要承重材料的结构体系，覆盖从设计、构件验算、连接到施工安装的完整技术链条。
### 二、主要内容
1. **设计方法**
– **LRFD（荷载与抗力系数设计法）**
– **ASD（容许应力设计法）**
两种方法并行，工程师可根据业主要求或项目习惯任选。
2. **构件设计**
系统规定轴心/偏心受拉、受压、受弯、受剪、扭转及组合受力构件的强度与稳定性计算；给出紧凑型、非紧凑型与细长型截面分类及相应承载力折减条款。
3. **稳定分析**
提供三种可选路径：
– 有效长度法
– 二阶直接分析法
– 直接分析法（需考虑初始缺陷、几何非线性及刚度折减）。
4. **连接与节点**
给出角焊缝、对接焊缝、普通/高强螺栓以及组合连接的计算公式和构造要求；新增端板、抗滑移、抗震节点等 15 种典型连接型式设计指引。
5. **组合结构**
纳入钢-混凝土组合梁、组合柱、组合剪力墙的强度与挠度验算，以及抗剪栓钉、楼板有效宽度、振动舒适度等专项条款。
6. **板梁与加劲肋**
针对大跨度、高腹板板梁，给出横向/纵向加劲肋布置、局部稳定与抗剪承载力计算细则，可在 RFEM、ETABS 等软件中直接调用。
7. **抗震设计衔接**
与 AISC 341-22、AISC 358-22 等抗震规程无缝衔接，提供特殊抗弯框架、偏心/中心支撑框架的节点预认证与构造要求。
8. **单位制与附录**
采用美制与国际单位（SI）双轨制；附录涵盖火灾设计、疲劳评估、冷弯型钢、厚壁截面、高强材料等专项指引。
### 三、规范特点
– **体系完整**：从材料、构件到连接、施工，全流程覆盖。
– **方法灵活**：LRFD 与 ASD 并存，可配合不同项目风险等级。
– **软件友好**：已被 ETABS、RFEM、SAP2000 等主流结构软件深度嵌入，支持组合梁、板梁、节点、抗震连接等自动验算。
– **技术前沿**：反映近五年稳定理论、高强钢材、抗震连接试验最新成果，支持 SpeedCore 双钢板组合墙等新型体系设计。
AISC 360-22, officially titled **”ANSI/AISC 360-22 Specification for Structural Steel Buildings”**, is the current U.S. national standard for designing structural steel buildings and other structures. Published by the **American Institute of Steel Construction (AISC)** and approved by **ANSI**, it became effective on **January 31, 2023**, superseding AISC 360-16.
### 1. Scope
The specification governs the design, fabrication and erection of structural steel members and connections in buildings, including
– rolled and welded built-up shapes
– composite steel-concrete members
– cold-formed (when used as part of the primary frame) and stainless-steel elements
It is written in **limit-states format** and offers two parallel design routes:
– **Load and Resistance Factor Design (LRFD)**
– **Allowable Strength Design (ASD)**
### 2. Key Sections
– **Materials & General Design Requirements**
Defines steel grades (ASTM A992, A572, A913, A500, etc.), ductility limits and required strength/load combinations drawn from ASCE 7.
– **Tension, Compression, Flexure & Shear**
Provides unified equations for nominal strength of beams, columns, bracing and truss members; classifies cross-sections (compact, non-compact, slender); gives stability-related resistance factors.
– **Stability Analysis & Design**
Recognizes three paths:
– Effective-length (K-factor) approach
– Direct Analysis Method (DM) with notional loads and stiffness reductions
– Second-order elastic analysis option
Explicitly requires consideration of initial out-of-plumbness, residual stresses and P-Δ / P-δ effects.
– **Connections & Joints**
Covers welds (fillet, groove, plug/slot), bolts (pretensioned and slip-critical) and combinations thereof; includes new pre-qualified moment-connection data aligned with AISC 358-22; introduces enhanced block-shear provisions for coped beams and gusset plates.
– **Composite Members**
Supplies strength and stiffness models for composite beams (with formed deck and shear studs), encased and filled composite columns, and composite plate shear walls; gives vibration and deflection limits for floor systems.
– **Plate Girders & Stiffeners**
Presents tension-field action models, transverse/ longitudinal stiffener requirements and interaction equations for moment, shear and axial force in slender-web girders.
– **Fatigue & Serviceability**
Appendix 3 retains hot-spot and nominal-stress S-N curves for cyclic loading; deflection, drift and vibration criteria reference industry guidelines.
### 3. Design Aids & Software Integration
Resistance equations are coded in mainstream programs (ETABS, SAP2000, STAAD.Pro, RFEM, RAM, Tekla, Advance Steel). AISC publishes a companion **”Steel Construction Manual”, 16th edition**, containing numerical tables, design examples and alignment with 360-22 provisions.
### 4. Links to Seismic & Fire Provisions
AISC 360-22 is the **base specification** referenced by:
– AISC 341-22 (Seismic Provisions)
– AISC 358-22 (Pre-qualified Moment Connections)
– AISC 303-22 (Code of Standard Practice)
For fire safety it allows rational engineering analysis or references to ASCE 29 and upcoming AISC fire-design guidelines.
### 5. International Influence
Beyond the U.S., AISC 360-22 is adopted—wholly or in part—for high-rise buildings, industrial plants and infrastructure projects in Latin America, the Middle East and Asia-Pacific. Its dual-unit format (U.S. Customary & SI) facilitates direct use in global contracts.
In short, AISC 360-22 is the **authoritative technical document** for structural steel design in the United States and a de-facto world reference, integrating the latest research on stability, high-strength steels, composite action and connection performance into a single, user-oriented specification.
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