CAEE 210 Lecture 9: 5 - Wood Engineering

• School: Drexel University
• Department: Civil, Architectural & Environmental Engr
• Course: CAEE 210
• Professor: Abi Aghayere

Document Summary

Amusement park structures: relatively low maintenance, unique ability to resist cyclic or dynamic loading (fatigue) Biological material, renewable - strength varies, depends on environmental conditions. Non-homogeneous and anisotropic - strength depends on direction of stress relative to direction of wood grain. Wood structural properties: a. b. a. b. c. d. e. f. g. h. i. j. 7. a. b. c. d. e. f. a. b. c. d. e. a. b. High variability properties - even between same tree species. Fiber saturation point (fsp) -> free water or water in cell cavities fully dissipated but cell walls become saturated. Equilibrium moisture content (emc) = moisture in wood in balance with surrounding atmosphere (~8-13% mc on the average for interior) Two classes of lumber based on mc: green lumber = freshly cut lumber (mc >19%, dry or seasoned sawn lumber (mc 19% or less, air drying or kiln drying (exposure to heat) i. ii.