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Introduction: Wood properties, species, and grades
Published in Abi Aghayere, Jason Vigil, Structural Wood Design ASD/LRFD, 2017
The United States system of units is used in this book, and accuracy to at most three significant figures is maintained in all the example problems. The standard unit of measurement for lumber in the United States is the board foot (bf), which is defined as the volume of 144 in.3 of lumber using nominal dimensions. The Engineering News-Record, the construction industry leading magazine, publishes the prevailing cost of lumber in the United States and Canada in units of 1000 board feet (Mbf). For example, 2× 61umber that is 18 ft long is equivalent to 18 board feet or 0.018 Mbf. That is, (2in.)(6in.)(18ft×12)144in.3=18bfor0.018Mbf $$ \frac{(2 \text{in}.) (6 \text{in}.) (18 \text{ft} \times 12)}{144 \text{in}.^{3}} = 18 \text{bf} \text{or} 0.018 \text{Mbf} $$
Production planning and project scheduling for engineer-to-order systems- case study for engineered wood production
Published in International Journal of Production Research, 2021
Marzieh Ghiyasinasab, Nadia Lehoux, Sylvain Ménard, Caroline Cloutier
The SME under study produces glulam which is a popular engineered wood product used in wood structures. After the award of the project, the company receives the architectural design of the building prepared by the architect partner and specifies the design and the drawings for the production of the engineered wood portion. Based on the architectural design, the company further details the design and drawings for the production of the glulam portion which determines the specifications of the structure such as the quantity of components and their dimensions. Technological production limitations may lead to changes in the design of the building which must be validated with the client. Client approval is a milestone that restrains the start of production. Once the design is finalised, the company’s engineer and technician develop the specific plans (drawings) needed for production. Although these resources are mostly needed at the beginning of the project, they continue to monitor the project throughout the production phase and may need to adapt the design and/or the drawings as production progresses (engineering and drawing phases). The production phase includes inspection and grading of the wood, finger jointing, drying, planing, gluing and pressing. The production phase involves the production of beams of preset widths with varying lengths and heights. The main sizes of widths are 80, 130, 175, 215 and 265 millimetres. Product volume is measured in board feet (0.00236 m3). The capacity of production is on average 12,000 board feet per week. The carpentry station machines the components (cutting, sawing and drilling to desired specifications, etc.). The final step is finishing (sanding, staining, applying protective finish, etc.) and preparing the products for delivery. Carpentry and production as well as finishing and carpentry phases have a start-to-start relation with a time lag. Figure 2 illustrates the phases and their sequences.