wood frame construction manual wood frame construction manual

352 Pages·2011·10.23 MB·English

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Updates and Errata
While every precaution has been taken to
ensure the accuracy of this document, errors
may have occurred during development.
Updates or Errata are posted to the American
Wood Council website at www.awc.org.
Technical inquiries may be addressed to
[email protected].
On behalf of the industry it represents, AWC is committed to ensuring a resilient, safe, and sustainable
built environment. To achieve these objectives, AWC contributes to the development of sound public
policies, codes, and regulations which allow for the appropriate and responsible manufacture and use of
wood products. We support the utilization of wood products by developing and disseminating consensus
standards, comprehensive technical guidelines, and tools for wood design and construction, as well as
providing education regarding their application.
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WFCM
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for One- and Two-Family Dwellings
AMERICAN
WOOD
COUNCIL
A P P R O V E D
ii WOOD FRAME CONSTRUCTION MANUAL
Wood Frame Construction Manual (WFCM) for One- and Two-Family Dwellings 2018 Edition
First Web Version: November 2017
ISBN 978-1-940383-44-6
Copyright © 2017 by American Wood Council
All rights reserved. No part of this publication may be reproduced, distributed, or transmitted in any form or by any
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AMERICAN WOOD COUNCIL
WOOD FRAME CONSTRUCTION MANUAL iii
Foreword
The Wood Frame Construction Manual for One- and often results in tables that are based on the worst case.
Two-Family Dwellings (WFCM) provides engineered For specific design cases, the user may find advantages to
and prescriptive design requirements for wood frame computing design requirements directly from ASCE 7-16
construction used in one and two-family dwellings. The load requirements using the actual building geometry.
provisions of the WFCM are based on dead, live, snow, This will usually result in some added economy in design.
seismic and wind loads derived from provisions of the Since the first edition of the WFCM in 1995, the As-
ASCE 7-16 Minimum Design Loads and Associated Cri- sociation’s Technical Committee has continued to study
teria for Buildings and Other Structures. In general, the and evaluate new data and developments in wood design.
framing systems described in the WFCM utilize repetitive Subsequent editions of the WFCM have included appropri-
member wood assemblies. ate revisions to provide for use of such new information.
The WFCM includes general information on loads and This edition incorporates numerous changes considered
resistances. The limitations of applicability are provided by AWC’s ANSI-accredited Wood Design Standards
in Chapters 2 and 3. Chapter 2 provides minimum loads Committee. The contributions of the members of this
for buildings within the scope of this document for the Committee to improvement of the WFCM as a national
purpose of establishing specific resistance requirements. design standard for wood construction are especially
Note that Chapter 2 also contains some necessary con- recognized.
struction details. These details have been derived from In developing the provisions of the WFCM, the
typical code provisions and are included in Chapter 2 most reliable data available from laboratory tests and
for the convenience of the designer. Chapter 3 provides experience with structures in-service have been carefully
several prescriptive solutions derived from Chapter 2 load analyzed and evaluated for the purpose of providing a
requirements. Therefore, it is perfectly acceptable to use consistent standard of practice. It is intended that this doc-
Chapter 3 provisions for parts of a design and Chapter 2 ument be used in conjunction with competent engineering
for other parts. design, accurate fabrication, and adequate supervision
The user should be aware that tables often include of construction. Therefore, AWC does not assume any
condensed information that covers more than one design responsibility for errors or omissions in the WFCM nor
condition. In keeping with good engineering practice, this for engineering designs or plans prepared from it.
American Wood Council
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No reproduction or transfer authorized.
AMERICAN WOOD COUNCIL
iv WOOD FRAME CONSTRUCTION MANUAL
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No reproduction or transfer authorized.
AMERICAN WOOD COUNCIL
WOOD FRAME CONSTRUCTION MANUAL v
Table of Contents
Chapter/Title Page Chapter/Title Page
1 General Information 1 3 Prescriptive Design 113
................................................................... .............................................................
1.1 Scope 3 3.1 General Provisions 115
....................................................................................................... ........................................................
1.2 Materials Standards 4 3.2 Connections 116
.............................................................. ...........................................................................
1.3 Definitions 5 3.3 Floor Systems 119
........................................................................................ ......................................................................
1.4 Symbols 9 3.4 Wall Systems 121
............................................................................................... ........................................................................
Figures 11 3.5 Roof Systems 123
............................................................................................................ .......................................................................
List of Figures 125
.................................................................................
2 Engineered Design 13 List of Tables 146
..................................................................... ....................................................................................
2.1 General Provisions 15 Appendix A 331
........................................................... .........................................................................................
2.2 Connections 17
..............................................................................
2.3 Floor Systems 19 Supplement 337
......................................................................... .........................................................................................
2.4 Wall Systems 21
...........................................................................
2.5 Roof Systems 23 References 341
.......................................................................... ...........................................................................................
List of Figures 26
....................................................................................
List of Tables 61
.......................................................................................
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AMERICAN WOOD COUNCIL
vi WOOD FRAME CONSTRUCTION MANUAL
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No reproduction or transfer authorized.
AMERICAN WOOD COUNCIL
WOOD FRAME CONSTRUCTION MANUAL 1
1
GENERAL
INFORMATION
1.1 Scope 3
1.2 Materials Standards 4
1.3 Definitions 5
1.4 Symbols 9
Figure 1.1 Basic Wind Speeds for One- and Two-Family
Dwellings Based on 3-second Gust Basic Wind
Speeds for Risk Category II Buildings .................11
Figure 1.2 Mean Roof Height (MRH) ....................................12
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AMERICAN WOOD COUNCIL
2 GENERAL INFORMATION
Table 1 Applicability Limitations
Reference
Attribute Limitation Section Figures
BUILDING DIMENSIONS
Mean Roof Height (MRH) 33' 1.1.3.1a 1.2
Number of Stories 3 1.1.3.1a -
Building Length and Width 80' 1.1.3.1b -
LOAD ASSUMPTIONS
(See Chapter 2 or Chapter 3 tables for load assumptions
applicable to the specific tabulated requirement)
Load Type Load Assumption
Partition Dead Load 0-8 psf of floor area
Wall Assembly Dead Load 11-18 psf
Floor Dead Load 10-20 psf
Roof/Ceiling Assembly Dead Load 0-25 psf
Floor Live Load 30-40 psf
Roof Live Load 20 psf
Ceiling Live Load 10-20 psf
Ground Snow Load 0-70 psf
90-195 mph wind speed
Wind Load (3-second gust)
Exposure B, C, and D (See Figure 1.1)
Seismic Design Category (SDC)
Seismic Load
SDC A, B, C, D , D , and D
0 1 2
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AMERICAN WOOD COUNCIL