STRUCTURAL STANDARDS

Laws:

United States Code (USC):

• Compliance with Nationally Recognized Codes USC Title 40, Chapter 12, Section 619

Executive Orders (EOs)

• Executive Order 12699 Seismic Safety of Federal and Federally Assisted or Regulated New Building Construction (PDF)
• Executive Order 12941 Seismic Safety of Existing Federally Owned or Leased Buildings (PDF)

Building Codes and Standards

• IBC 2003 (All buildings with an assembly occupancy and a total occupancy greater than 300 shall be designed as a Category III structure in accordance with Table 1604.5)
• IBC-06 (for all projects in which Predesign begins after September 30, 2006)
• IEBC 2003
• IEBC-06 (for all projects in which Predesign begins after September 30, 2006)
• ASCE 7-02
• ASCE 7-05 (for all projects in which Predesign begins after
  September 30, 2006)
• ACI 318-05
• ACI 301-05
• ACI 530-05
• AISC ASD 9th edition, LRFD 3rd edition, or AISC 13th edition
• NDS-2005
• AITC Timber Construction Manual, 5th edition

Directives, Standards, and NPS Guidelines

Load Requirements

• Floor live Load: IBC 2003 or IBC 2006, as applicable
• Roof Live Load: IBC 2003 or IBC 2006, as applicable
• Snow Load: IBC 2003 or IBC 2006 as applicable, as required for building location, with consideration of:
• Unbalanced snow load
• Snow drifting at lower roofs and projections
• Roof valley snow drifting
• Sliding snow
• Wind Load: IBC 2003 or IBC 2006, as applicable, as required for building location
• Seismic: IBC 2003 or IBC 2006, as applicable, as required for building location
• Vehicle Bridges: HS20
• Pedestrian Bridges and Boardwalks: 85 psf

Foundations

• Frost Depth: As required for building location

Concrete

• Minimum slab-on-grade thickness 4" at thinnest point
• Minimum compressive strength at 28 days: as required by design, but not less than 3000psi
• Minimum 15% flyash content
• Reinforcing steel: ASTM A615 Grade 60

Masonry

• Concrete masonry minimum f'm: 1500 psi
• Reinforcing Steel: ASTM A615 Grade 60
• Below grade walls and retaining walls grouted solid

Steel

• W Shapes: ASTM A992, 50 ksi
• S, M, HP and Channels: ASTM A36 or A572 Grade 50
• Angles and Plates: ASTM A36
• TS or HSS: ASTM A500, Grade B, 46 ksi
• Minimum Fillet Weld Size: 3/16"

Wood

• Minimum roof sheathing thickness, 5/8"
• Minimum wall sheathing thickness 1/2"
• Framing Lumber (depending on location and availability)
• Southern Pine No. 2 or better
• Hem Fir No.2 or better
• Douglas Fir Larch No.2 or better
• Provide blocking between roof framing members at
  bearing locations
• Provide plywood or OSB sheathing over heavy timber decking to create a diaphragm
• Whenever possible, engineered lumber (Glulams, LVL’s) shall be substituted for solid sawn members larger than 8x8.

Professional Guidance

Coastal/Marine Construction

• Coastal Construction Manual
• Coastal Engineering Manual EM 1110-2-1100

Tornado Shelters

• FEMA 361

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