2018 Manual for Engineered Wood Construction

1 By downloading this file to your computer, you are accepting and agreeing to the terms of AWC's end-user license agreement (EULA), which may be viewed here: End User License Agreement. Copyright infringement is a violation of federal law subject to criminal and civil penalties. 2018. E D I T I O N. Manual . for Engineered Wood Construction AMERICAN. WOOD. COUNCIL. 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 Technical inquiries may be addressed to 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.

2 I Manual FOR Engineered WOOD Construction . 2018. E D I T I O N. Manual . for Engineered Wood Construction AMERICAN. WOOD. COUNCIL. Copyright 2018. American AMERICAN Wood Council WOOD COUNCIL. ii Manual FOR Engineered WOOD Construction . Manual for Engineered Wood Construction 2018 Edition First Web Version:September 2018. ISBN 978-1-940383-49-1. Copyright 2018 by American Wood Council All rights reserved. No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including, without limitation, electronic, optical, or mechanical means (by way of example and not limitation, photocopying, or recording by or in an information storage retrieval system) without express written permission of the American Wood Council. For information on permission to copy material, please contact: Copyright Permission American Wood Council 222 Catoctin Circle, SE, Suite 201. Leesburg, VA 20175. Copyright American Wood Council.

3 Downloaded/printed pursuant to License Agreement. No reproduction or transfer authorized. AMERICAN WOOD COUNCIL. Manual FOR Engineered WOOD Construction iii FOREWORD. This Manual for Engineered Wood Construction 75 years, first in the form of the Wood Structural design ( Manual ) provides guidance for design of most wood- Data series and then in the National design Specification based structural products used in the Construction of wood (NDS) for Wood Construction . buildings. This Manual is intended for use with the Wood It is intended that this document be used in conjunction design Package which includes the following documents: with competent engineering design , accurate fabrication, and adequate supervision of Construction . AWC does not ANSI/AWC NDS-2018 National design Speci- assume any responsibility for errors or omissions in the fication (NDS ) for Wood Construction with document, nor for engineering designs, plans, or construc- Commentary, tion prepared from it.

4 NDS Supplement design Values for Wood Con- Those using this document assume all liability arising struction, 2018 Edition, from its use. The design of Engineered structures is within ANSI/AWC SDPWS-2015 Special design Pro- the scope of expertise of licensed engineers, architects, or visions for Wind and Seismic (SDPWS) with other licensed professionals for applications to a particular Commentary, structure. American Wood Council The American Wood Council (AWC) has developed this Manual for design professionals. AWC and its prede- cessor organizations have provided engineering design information to users of structural wood products for over Copyright American Wood Council. Downloaded/printed pursuant to License Agreement. No reproduction or transfer authorized. AMERICAN WOOD COUNCIL. iv Manual FOR Engineered WOOD Construction . Copyright American Wood Council. Downloaded/printed pursuant to License Agreement. No reproduction or transfer authorized.

5 AMERICAN WOOD COUNCIL. Manual FOR Engineered WOOD Construction v TABLE OF CONTENTS. Part/Title Page Part/Title Page M1: GENERAL REQUIREMENTS FOR M7: PREFABRICATED WOOD 27. STRUCTURAL 1 General Products Covered in This Manual Reference design Values General Requirements Adjustment of Reference design design Procedures Values Special design Considerations M2: design VALUES FOR STRUCTURAL. 3 M8: STRUCTURAL COMPOSITE 43. General Information General Reference design Values Reference design Values Adjustment of Reference design Adjustment of Reference design Values Values Special design Considerations M3: design PROVISIONS AND. 5 M9: WOOD STRUCTURAL 49. General General Bending Members - General Reference design Values Bending Members - Flexure Adjustment of Reference design Bending Members - Shear Values Bending Members - Deflection design Considerations Compression Members Solid Columns M10: CROSS-LAMINATED 59. General Tension Members Reference design Values Combined Bending and Axial Adjustment of Reference design Loading Values design for Bearing Special design Considerations M4: SAWN 11.

6 General M11: MECHANICAL 65. General Reference design Values Reference design Values Adjustment of Reference design Adjustment of Reference design Values Values Special design Considerations Typical Connection Details M5: STRUCTURAL GLUED LAMINATED Pre- Engineered Metal Connectors 17. General M12: DOWEL- TYPE 81. General Reference design Values Reference Withdrawal and Pull- Adjustment of Reference design Through design Values Values Reference Lateral design Values Special design Considerations Combined Lateral and Withdrawal M6: ROUND TIMBER POLES AND 23 Loads General Adjustment of Reference design Reference design Values Values Adjustment of Reference design Multiple Fasteners Values Special design Considerations Copyright American Wood Council. Downloaded/printed pursuant to License Agreement. No reproduction or transfer authorized. AMERICAN WOOD COUNCIL. vi Manual FOR Engineered WOOD Construction . Part/Title Page Part/Title Page M13: SPLIT RING AND SHEAR PLATE M15: SPECIAL LOADING 89.

7 85 Lateral Distribution of Concentrated General Loads Reference design Values Spaced Columns Placement of Split Ring and Shear Built-Up Columns Plate Connectors Wood Columns with Side Loads and M14: TIMBER 87 Eccentricity General M16: FIRE design OF WOOD 91. Reference design Values General Placement of Timber Rivets design Procedures for Exposed Wood Members Wood Connections LIST OF TABLES. Applicability of Adjustment Factors for Wood Structural Panel Rigidity and Shear Sawn 13 Through-the-Thickness 55. Approximate Moisture and Thermal Applicability of Adjustment Factors for Dimensional 14 Wood Structural 56. Coefficient of Moisture Expansion, eME, Panel Edge 57. and Fiber Saturation Point, FSP, for Solid Minimum Nailing for Wood Structural 15. Panel 58. Coefficient of Thermal Expansion, TE, for ASD Reference design Values for Solid 16. Laminations (for use in the ).. 60. Economical Spans for Structural Glued ASD Reference design Values for CLT.

8 Laminated Timber Framing 19. (for use in the ) .. 62. Applicability of Adjustment Factors for Applicability of Adjustment Factors for Structural Glued Laminated 21. Cross-Laminated 63. Average Specific Gravity and Weight Applicability of Adjustment Factors for 22. Mechanical 67. Applicability of Adjustment Factors for Applicability of Adjustment Factors for Round Timber Poles and 25. Dowel-Type 83. Applicability of Adjustment Factors for Applicability of Adjustment Factors for Prefabricated Wood Split Ring and Shear Plate 86. 30. Applicability of Adjustment Factors for Applicability of Adjustment Factors for Timber 88. Structural Composite 46. Heavy Timber Size 92. Guide to Panel 51. Minimum Sizes to Qualify as Heavy Wood Structural Panel Bending Stiffness Timber Construction .. 93. and Strength 52. Privacy Afforded According to Wood Structural Panel Axial Stiffness, STC 99. Tension, and Compression 53. Wood Structural Panel Shear-in-the-Plane 55.

9 Copyright American Wood Council. Downloaded/printed pursuant to License Agreement. No reproduction or transfer authorized. AMERICAN WOOD COUNCIL. Manual FOR Engineered WOOD Construction vii LIST OF FIGURES. Unbalanced and Balanced Layup Details for Vertical Load 41. 18. Structural Panel with Strength Direction Structural Glued Laminated Timber Axes Across 50. 20. Example of Structural Panel in 51. design Span 31. Structural Panel with Axial Compression Load Case 33 Load in the Plane of the 54. End Bearing Web Stiffeners Shear-in-the-Plane for Wood Structural (Bearing Block).. 35 54. Web Stiffener Bearing 36 Through-the-Thickness Shear for Wood Structural 54. Beveled End 36. Example of CLT Panel in 61. Sloped Bearing Conditions (Low End).. 37. CLT Panel in Bending with Axial Sloped Bearing Conditions (High End).. 38. Compression Load in the Plane of the Lateral Support Requirements for Joists 61. in Hangers .. 39. Shear-in-the-Plane for CLT 63.

10 Top Flange Hanger 39. Through-the-Thickness Shear for Connection Requirements for Face Nail CLT 63. 40. Cross Sections of Possible One-Hour Area 98. Copyright American Wood Council. Downloaded/printed pursuant to License Agreement. No reproduction or transfer authorized. AMERICAN WOOD COUNCIL. viii Manual FOR Engineered WOOD Construction . Copyright American Wood Council. Downloaded/printed pursuant to License Agreement. No reproduction or transfer authorized. AMERICAN WOOD COUNCIL. Manual FOR Engineered WOOD Construction 1. 1. M1: GENERAL. REQUIREMENTS. FOR. STRUCTURAL. design . Products Covered in This Manual 2. General Requirements 2. Bracing 2. design Procedures 2. Copyright American Wood Council. Downloaded/printed pursuant to License Agreement. No reproduction or transfer authorized. AMERICAN WOOD COUNCIL. 2 M1: GENERAL REQUIREMENTS FOR STRUCTURAL design . Products Covered in This Manual This Manual was developed with the intention of cov- Prefabricated Wood I-Joists Chapter 7.