scope:

This Specification is intended for the design of round and rectangular hollow structural sections (HSS) that are used as s!ructural members in buildings and the design of connections to HSS. HSS include: (I) prismatic structural shapes and (2) products of a pipe or tubing mill that meet the geometric tolerances, tensile requirements and chemical requirements of a standard specification. Rectangular HSS include square and rectangular cross-sections Ihat have rounded corners within the tolerances of an appropriate product specification. Only unstiffened non-composite HSS in non-fatigue applications are considered in this Specification.

This Specification is a supplement to the AISC Load and Resistance Factor Design Specification for Structural Steel Bui/dings (AISC, 1993), hereinafter referred to as the LRFD Specification. In some cases, criteria taken from the LRFD Specification have been modified to appear in non-dimensional form and to apply directly to rectangular HSS, which have two webs. For situations that are not covered in this Specification, the criteria in the LRFD Specification shall apply. [n seismic applications, HSS shall also be designed to meet the requirements of the AISC Seismic Provisions for Structural Steel Buildings (AISC, 1997).