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

Current through Register 1525, July 5, 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
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Two-span continuous
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Combination simple- and two-span continuous
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Cantilevered pieces intermixed
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Controlled random layup
Mechanically laminated decking
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2-inch decking
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3-inch and 4-inch decking
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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.
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=
Allowable bending stress adjusted by
							 applicable factors.
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=
Modulus of elasticity adjusted by
							 applicable factors.