 Printer EmailThe purpose of this book is to introduce engineers, technologists, and architects to the design of wood structures. It is designed to serve either as a text for a course in timber design or as a reference for systematic self-study of the subject. The book will lead the reader through the complete design of a wood structure (except for the foundation). The sequence of the material follows the same general order that it would in actual design: The need for such an overall approach to the subject became clear from experience gained in teaching timber design at the undergraduate and graduate levels. This text pulls together the design of the various elements into a single reference. A large number of practical design examples are provided throughout the text. Because of their widespread usage, buildings naturally form the basis of the majority of these examples. However, the principles of member design and diaphragm design have application to other structures (such as concrete formwork and falsework). This book relies on practical, current industry literature as the basis for structural design. This includes publications of the American Forest and Paper Association (AF&PA), the International Codes Council (ICC), the American Society of Civil Engineers (ASCE), APA—The Engineered Wood Association, and the American Institute of Timber Construction (AITC). In the writing of this text, an effort has been made to conform to the spirit and intent of the reference documents. The interpretations are those of the authors and are intended to reflect current structural design practice. The material presented is suggested as a guide only, and final design responsibility, lies with the structural engineer. The sixth edition of this book was promoted by five major developments: The National Design Specification (NDS) is published by the American Forest & Paper Association (AF&PA) and represents the latest structural design recommendations by the wood industry. The 2005 NDS presents both traditional allowable stress design (ASD) provisions as well as new load and resistance factor design (LRFD) provisions. The inclusion of the LRFD provisions is new to the NDS for the 2005 edition. As such, the 2005 NDS is considered a dualformat design specification. While ASD has been and may continue to be the method of choice for many designers of wood buildings, the acceptance and use of LRFD for wood The International Building Code (IBC) is a product of the International Codes Council (ICC). The ICC brought together the three regional model building code organizations to develop and administer a single national building code. The first edition of the IBC was published in 2000, and now nearly all regions of the U.S. have adopted all or part of the IBC at either the state or local level. Traditionally, the NDS has been based on the principles of what is termed allowable stress design (ASD). In ASD allowable stresses of a material are compared to calculated working stresses resulting from service loads. Recently, the wood industry and design community completed the development of a load and resistance factor design (LRFD) specification for wood construction. In LRFD, adjusted nominal capacities (resistance) are compared to the effect of factored loads. The factors are developed for both resistance and loads such that uncertainty and consequence of failure are explicitly recognized. The LRFD approach to wood design is now included in the 2005 edition of the NDS. This sixth edition of Design of Wood Structures presents both ASD and LRFD guidelines as provided in the NDS. In many examples, both ASD and LRFD approaches are presented to allow the reader a direct, side-by-side comparison of the two methods. Donald E. Breyer, P.E.
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