scope:

OBJECTIVE AND SCOPE

The objective of this Design Guide is to assist the practicing engineer in determining the appropriate layout, loading and serviceability requirements for steel-framed stairways based on the applicable code requirements. Typical types of stairways and guards are presented along with member types and framing options. The Design Guide presents standard design methodologies for the design of steel elements for stairways, handrail, guards and associated connections. Additionally, information regarding delegated design and recommended standard practices related to stairways is provided.

When referring to the structural engineer responsible for the design of the steel structure, this Design Guide uses the term "structural engineer of record (SER)" as it is used in the AISC Code of Standard Practice for Steel Buildings and Bridges, hereafter referred to as the AISC Code of Standard Practice (AISC, 2016a). This Design Guide also makes reference to the architect, who acts as the entity that provides architectural design for stairways. When referring to the engineer responsible for the structural design of steelframed stairways, this Design Guide uses the term "specialty structural engineer (SSE)." On some projects the SER may serve as both the structural engineer for the building steel structure and as the SSE for steel-framed stairway design.

This Design Guide illustrates methods for the layout and design of common stairway, handrail, guards and associated connections based on structural principles and presents the design basis and examples for:

(1) Load determination for gravity and seismic forces

(2) Tread and riser section

(3) Stringer design as a simple span

(4) Stringer design with integrated landing

(5) Guard and handrail assembly

(6) Typical connections

Although this Design Guide is primarily intended to assist the practicing engineer, it may also be a reference for architects, steel fabricators, steel detailers and steel erectors.

Complex and custom stairway systems, independent stairways, nonsteel elements (e.g., structural concrete, glazing, aluminum, etc.), unique architectural requirements, and other nonstandard designs are beyond the scope of this Design Guide. A valuable resource for additional information related to stairs and railings can be found in the National Association of Architectural Metal Manufacturers (NAAMM) Metal Stairs Manual, AMP510 (NAAMM, 1992), and Pipe Railing Systems Manual Including Round Tube, AMP521, hereafter referred to as the NAAMM Railing Manual (NAAMM, 2001).