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Steel structures constructed in seismic zones must meet the following design requirements: 1. For seismic fortification levels of 7 or higher, horizontal bracing should be installed around the perimeter sections of the truss within its support plane. Theoretical calculations indicate that horizontal bracing enhances the truss's lateral seismic performance. For perimeter-supported trusses, three types of chord member configurations exist for the bracing plane: (1) Orthogonal-orthogonal type: Diagonal members are installed within the peripheral grid to form a closed system. (2) Orthogonal-oblique type: Horizontal members are arranged along the boundary to form a closed system. (3) Triaxial type: The support plane itself is composed of geometrically stable triangles, thus requiring no additional bracing. 2. The slenderness ratio of members within the peripheral 2–3 grid zones shall not exceed 180. This is because the chord members along the perimeter of the space frame experience rel...

Introduction In seismically active areas, steel space frames must not only meet load-bearing requirements but also exhibit excellent seismic performance. This article will discuss the seismic design codes, key design points, and their application in practical projects. Seismic Design Codes for Steel Space Frames China's "Code for Seismic Design of Buildings" (GB50011): Applicable to seismic design in mainland my country, it specifies structural seismic resistance levels, design basic earthquake accelerations, and structural categories. USA's "Code for Seismic Design of Steel Structures" (ANSI/AISC 341): Applicable to the United States, it emphasizes the ductility and energy dissipation capacity of structures and provides specific requirements for seismic design. European "Code for Seismic Design of Steel Structures" (EN 1998-1): Applicable to Europe, it incorporates the characteristics of steel structures and provides guiding principles for seism...