Would you like to tell us about a lower price? I have not gone through the book fully. Breyer does a good job of explaining almost everything in clear detail. The only issue with the book is that the examples cover only the basics with its examples.
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Jun, By Jerod G. Johnson, Ph. In recent years, the push to LRFD has been embraced by many for the design of steel and masonry systems. While allowable stress design ASD methods are still acceptable, the perception is that the majority of engineers use LRFD for concrete, masonry and steel systems. This brings us to wood. ASD has been the basis for engineering wood systems for decades. Textbooks, codes and even the design values listed in technical catalogs of proprietary fasteners and hardware reflect the ASD approach.
However, provisions for LRFD design in wood have gradually become more predominant, and it may be only a matter of time before ASD methods are relegated to appendices while LRFD becomes the primary basis of design. The adoption of LRFD methods for wood has a history not unlike its concrete, masonry and steel counterparts. Times are changing, and little by little the LRFD approach is becoming more mainstream for wood design.
At nearly double the size of earlier editions, this text contains side-by-side instruction, examples, and theory of both ASD and LRFD methods for wood design.
Even so, it should be noted that this information is the product of decades of research in the development of LRFD methods for wood. Once we agree that moisture, temperature, flat use, incision, and repetitive use factors are not applicable each having a value of 1.
Now consider the same scenario, but follow the LRFD approach. As you might expect, the value for is smaller for sustained loads and larger for transient loads. The value ranges from 0. The b factor is not unlike that used for steel and concrete, having a value of 0. If we are using LRFD, the value for is 0.
Comparison of design values shows a general consistency to the comparison of the ASD 1. Admittedly, LRFD requires a few more variables, a little more calculation and perhaps a bit more effort, but it is a step toward a unified and arguably more reliable design approach for the four primary materials of construction. Whether you or your office should embrace LRFD for wood is still a matter of choice, but may eventually become only a matter of time.
Design of Wood Structures-ASD/LRFD
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