کتاب طراحی سازه های چوبی
Structural Wood Design
مولف یا نویسنده:
Abi Aghayere – Jason Vigil
چاپ و انتشار:
The primary audience for this book are students of civil and architectural engineering, civil and
construction engineering technology, and architecture in a typical undergraduate course in wood
or timber design. The book can be used for a one-semester course in structural wood or timber
design and should prepare students to apply the fundamentals of structural wood design to typical
projects that might occur in practice. The practice-oriented and easy-to-follow but thorough
approach to design that is adopted, and the many practical examples applicable to typical everyday
projects that are presented, should also make the book a good resource for practicing engineers,
architects, and builders and those preparing for professional licensure exams.
The book conforms to the 2005 National Design Speciﬁcation for Wood Construction, and is
intended to provide the essentials of structural design in wood from a practical perspective and
to bridge the gap between the design of individual wood structural members and the complete
design of a wood structure, thus providing a holistic approach to structural wood design. Other
unique features of this book include a discussion and description of common wood structural
elements and systems that introduce the reader to wood building structures, a complete wood
building design case study, the design of wood ﬂoors for vibrations, the general analysis of shear
walls for overturning, including all applicable loads, the many three- and two-dimensional draw-
ings and illustrations to assist readers’ understanding of the concepts, and the easy-to-use design
aids for the quick design of common structural members, such as ﬂoor joists, columns, and wall
Chapter 1 The reader is introduced to wood design through a discussion and description of
the various wood structural elements and systems that occur in wood structures as well as the
properties of wood that affect its structural strength.
Chapter 2 The various structural loads—dead, live, snow, wind, and seismic—are discussed
and several examples are presented. This succinct treatment of structural loads gives the reader
adequate information to calculate the loads acting on typical wood building structures.
Chapter 3 Calculation of the allowable stresses for both sawn lumber and glulam in accordance
with the 2005 National Design Speciﬁcation as well as a discussion of the various stress adjustment
factors are presented in this chapter. Glued laminated timber (glulam), the various grades of
glulam, and determination of the controlling load combination in a wood building using the
normalized load method are also discussed.
Chapter 4 The design and analysis of joists, beams, and girders are discussed and several ex-
amples are presented. The design of wood ﬂoors for vibrations, miscellaneous stresses in wood
members, the selection of preengineered wood ﬂexural members, and the design of sawn-lumber
decking are also discussed.xii P R E F A C E
Chapter 5 The design of wood members subjected to axial and bending loads, such as truss
web and chord members, solid and built-up columns, and wall studs, is discussed.
Chapter 6 The design of roof and ﬂoor sheathing for gravity loads and the design of roof and
ﬂoor diaphragms for lateral loads are discussed. Calculation of the forces in diaphragm chords
and drag struts is also discussed, as well as the design of these axially loaded elements.
Chapter 7 The design of exterior wall sheathing for wind load perpendicular to the face of a
wall and the design of wood shear walls or vertical diaphragms parallel to the lateral loads are
discussed. A general analysis of shear walls for overturning that takes into account all applicable
lateral and gravity loads is presented. The topic of combined shear and uplift in wall sheathing
is also discussed, and an example presented.
Chapter 8 The design of connections is covered in this chapter in a simpliﬁed manner. Design
examples are presented to show how the connection capacity tables in the NDS code are used.
Several practical connections and practical connection considerations are discussed.
Chapter 9 A complete building design case study is presented to help readers tie together the
pieces of wood structural element design presented in earlier chapters to create a total building
system design, and a realistic set of structural plans and details are also presented. This holistic
and practice-oriented approach to structural wood design is the hallmark of the book. The design
aids presented in Appendix B for the quick design of ﬂoor joists, columns, and wall studs
subjected to axial and lateral loads are utilized in this chapter.
In conclusion, we would like to offer the following personal dedications and thanksgiving:
To my wife, Josie, the love of my life and the apple of my eye, and to my precious children, Osa, Itohan,
Odosa, and Eghosa, for their support and encouragement. To my mother for instilling in me the discipline
of hard work and excellence, and to my Lord and Savior, Jesus Christ, for His grace, wisdom, and strength.
Rochester, New York
For Adele and Ivy; and for Michele, who ﬁrst showed me that ‘‘I can do all things through Christ which
strengtheneth me’’ (Phil. 4:13)
Rochester, New York
WO O D-PR O P E R T I E S , SP E C I E S , A N D GR A D E S
The purpose of this book is to present the design process for wood structures in a quick and
simple way, yet thoroughly enough to cover the analysis and design of the major structural
elements. In general, building plans and details are deﬁned by an architect and are usually given
to a structural engineer for design of structural elements and to present the design in the form
of structural drawings. In this book we take a project-based approach covering the design process
that a structural engineer would go through for a typical wood-framed structure.
The intended audience for this book is students taking a course in timber or structural wood
design and structural engineers and similarly qualiﬁed designers of wood or timber structures
looking for a simple and practical guide for design. The reader should have a working knowledge
of statics, strength of materials, structural analysis (including truss analysis), and load calculations
in accordance with building codes (dead, live, snow, wind, and seismic loads). Design loads are
reviewed in Chapter 2. The reader must also have available:
- National Design Speciﬁcation for Wood Construction, 2005 edition, ANSI/AF&PA (hereafter
referred to as the NDS code) 
- National Design Speciﬁcation Supplement: Design Values for Wood Construction, 2005 edition,
ANSI/AF&PA (hereafter referred to as NDS-S) 
- International Building Code, 2006 edition, International Code Council (ICC) (hereafter re-
ferred to as the IBC) 
- Minimum Design Loads for Buildings and Other Structures, 2005 edition, American Society of
Civil Engineers (ASCE) (hereafter referred to as ASCE 7)