1 September 1999
STEEL STRUCTURE DESIGN REQUIREMENTS
7-1. INTRODUCTION. This chapter prescribes criteria for the design of structural steel, open-
web joists, and cold-formed steel structural members in buildings.
7-2. GENERAL. Structural framing systems and elements of buildings will be designed in
accordance with the accepted industry standards described below. The type of steel and unit
dimension, (bay size, story, height, etc.), the system for structural framing, and the design
method used will be based on a comparative economic study and will be those that result in
the least cost for the required structure.
7-3. BASIS FOR DESIGN.
a. Structural Steel Construction. The design, fabrication and erection of structural steel
for buildings and structures will be in accordance with either the AISC Load and Resistance
Factor Design (AISC-LRFD) or AISC Specification for Structural Steel Buildings-Allowable
Stress Design (AISC-ASD). The seismic design of steel structures will be in accordance with
the additional provisions of TI 809-04, "Seismic Design for Buildings". Guidance on cold-
formed steel can be found in TI 809-07, "Design of Load Bearing Cold-Formed Steel Systems
and Masonry Veneer / Steel Stud Walls".
b. Cold-Formed Steel. The design of cold-formed carbon and low alloy steel structures
will be in accordance with the TI 809-07. The design of cold-formed stainless steel members
will be in accordance with ASCE 8, "Specifications for the Design of Cold-Formed Stainless
Steel Structural members. Composite slabs of concrete on steel deck will be designed and
constructed in accordance with ANSI/ASCE 9, "Standard for the Structural Design of
Composite Slabs". The seismic design of cold-formed steel structures will be in accordance
with the additional provisions of TI 809-04.
c. Steel Joists. The design, manufacture, and use of open web steel joists and joist
girders will be in accordance with one of the following Steel Joist Institute (SJI) specifications:
Standard Specifications for Open Web Steel Joists, K Series
Standard Specifications for Longspan Steel Joists, LH Series, and Deep Longspan
Steel Joists, DLH Series, or
Standard Specifications for Joist Girders.
d. Steel Cables Structures. The design, fabrication, and erection, including related
connections, and protective coatings of steel cables for buildings will be in accordance with
ASCE 19, "Structural Applications of Steel Cables for Buildings" except as modified as follows
for seismic design: