Code of Massachusetts Regulations
780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS
Chapter 23 - Wood
Section 2306 - ALLOWABLE STRESS DESIGN
Subsection 2306.1 - Allowable stress design

Universal Citation: 780 CMR MA Code of Regs 2306.1

Current through Register 1531, September 27, 2024

The structural analysis and construction of wood elements in structures using allowable stress design shall be in accordance with the following applicable standards:

American Forest & Paper Association.

NDS National Design Specification for Wood Construction

SDPWS Special Design Provisions for Wind and Seismic

American Institute of Timber Construction.

AITC 104 Typical Construction Details

AITC 110 Standard Appearance Grades for Structural Glued Laminated Timber

AITC 113 Standard for Dimensions of Structural Glued Laminated Timber

AITC 117 Standard Specifications for Structural Glued Laminated Timber of Softwood Species

AITC 119 Standard Specifications for Structural Glued Laminated Timber of Hardwood Species

ANSI/AITC A190.1 Structural Glued Laminated Timber

AITC 200 Inspection Manual

American Society of Agricultural and Biological Engineers.

ASABE EP 484.2 Diaphragm Design of Metal-clad, Post- Frame Rectangular Buildings

ASABE EP 486.1 Shallow Post Foundation Design

ASABE 559 Design Requirements and Bending Properties for Mechanically Laminated Columns

APA-The Engineered Wood Association.

Panel Design Specification

Plywood Design Specification Supplement 1 - Design & Fabrication of Plywood Curved Panel

Plywood Design Specification Supplement 2 - Design & Fabrication of Glued Plywood-lumber Beams

Plywood Design Specification Supplement 3 - Design & Fabrication of Plywood Stressed-skin Panels

Plywood Design Specification Supplement 4 - Design & Fabrication of Plywood Sandwich Panels

Plywood Design Specification Supplement 5 - Design & Fabrication of All-plywood Beams

EWS T300 Glulam Connection Details

EWS S560 Field Notching and Drilling of Glued Laminated Timber Beams

EWS S475 Glued Laminated Beam Design Tables

EWS X450 Glulam in Residential Construction

EWS X440 Product and Application Guide: Glulam

EWS R540 Builders Tips: Proper Storage and Handling of Glulam Beams

Truss Plate Institute, Inc.

TPI 1 National Design Standard for Metal Plate Connected Wood Truss Construction

2306.1.1 Joists and rafters. The design of rafter spans is permitted to be in accordance with the AF & PA Span Tables for Joists and Rafters.

2306.1.2 Plank and beam flooring. The design of plank and beam flooring is permitted to be in accordance with the AF & PA Wood Construction Data No. 4.

2306.1.3 Treated wood stress adjustments. The allowable unit stresses for preservative-treated wood need no adjustment for treatment, but are subject to other adjustments.

The allowable unit stresses for fire-retardant-treated wood, including fastener values, shall be developed from an approved method of investigation that considers the effects of anticipated temperature and humidity to which the fire-retardant-treated wood will be subjected, the type of treatment and the redrying process. Other adjustments are applicable except that the impact load duration shall not apply.

2306.1.4 Lumber decking. The capacity of lumber decking arranged according to the patterns described in Section 2304.8.2 shall be the lesser of the capacities determined for flexure and deflection according to the formulas in Table 2306.1.4.

TABLE 2306.1.4 ALLOWABLE LOADS FOR LUMBER DECKING

PATTERN ALLOWABLE AREA LOADa, b
Flexure Deflection
Simple span Click to view image Click to view image
Two-span continuous Click to view image Click to view image
Combination simple- and two-span continuous Click to view image Click to view image
Cantilevered pieces intermixed Click to view image Click to view image
Controlled random layup
Mechanically laminated decking Click to view image Click to view image
2-inch decking Click to view image Click to view image
3-inch and 4-inch decking Click to view image Click to view image

For SI: 1 inch = 25.4 mm.
a. [sigma]b = Allowable total uniform load limited by bending.
[sigma]DELTA = Allowable total uniform load limited by deflection.
b. d = Actual decking thickness.
l = Span of decking.

Click to view image
= Allowable bending stress adjusted by applicable factors.

Click to view image
= Modulus of elasticity adjusted by applicable factors.

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