Section 2212A — [DSA-SS]

LIGHT MODULAR STEEL MOMENT FRAMES FOR

PUBLIC ELEMENTARY AND SECONDARY

SCHOOLS, AND COMMUNITY COLLEGES

2212A.1.1 Configuration. Light modular steel moment frame buildings shall be constructed of factory-assem- bled modules comprising a single-story moment-resisting space frame supporting a floor and roof. Individual mod- ules shall not exceed a width of 14 feet (4.25 m) nor a length of 72 feet (22 m). All connections of beams to cor- ner columns shall be designed as moment-resisting in accordance with the criteria of Section 2212A.2. Mod- ules may be stacked to form multistory structures not exceeding 35 feet or two stories in height. When stacked modules are evaluated separately, seismic forces on each module shall be distributed in accordance with Section 12.8.3 of ASCE 7, considering the modules in the stacked condition. See Section 2212A.2.5 of this code.

2212A.1.2 Design, fabrication and erection. The design, fabrication and erection of light modular steel moment-

Fybi = The specified yield stress of beam “i.”

Fycj = The specified yield stress of column “j.”

Sbi = The flexural section modulus of each beam “i” that

is moment connected to the column “j” at the connection.

Scj = The flexural section modulus of each column “j” that

is moment connected to the beam “i” at the connection.

Exceptions:

1. Beam-to-column connections at the floor level beams of first or second-story modules need not comply with this requirement.

2. Beam-to-column strength ratios less than 1.4 are allowed if proven to be acceptable by analysis or testing.

2212A.2.3 Welding. Weld filler metals shall be capable of producing weld metal with a minimum Charpy V-Notch toughness of 20 ft-lb at 0°F. Where beam bottom flanges attach to columns with complete joint penetration groove welds and weld backing is used at the bottom surface of the beam flange, such backing shall be removed and the root pass back-gouged, repaired and reinforced with a minimum ³ /16 inch (5 mm) fillet weld.

2212A.2.4 Connection design. Connections of beams to columns shall have the design strength to resist the maxi- mum seismic load effect, Em , calculated in accordance with Section 12.4.3 of ASCE 7.

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STEEL

2212A.2.5 Multistory assemblies. Analysis of multistory assemblies shall be permitted to consider the stacked mod- ules as a single assembly, with restraint conditions between the stacked units that represent the actual method of attachment. Alternatively, it shall be permitted to ana- lyze the individual modules of stacked assemblies inde- pendently, with lateral and vertical reactions from modules above applied as concentrated loads at the top of the supporting module.