tailieunhanh - APA Engineered Wodd Handbooks Episode 14

Tham khảo tài liệu 'apa engineered wodd handbooks episode 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CHAPTER TWELVE DESIGNING AND DETAILING FOR PERMANENCE Ed Keith PE. Senior Engineer TSD The majority of the single- and multifamily homes built in the United States are constructed almost entirely out of wood or use a large percentage of wood products in addition to their primary construction material. Many light commercial buildings also make extensive use of wood construction due to its ease of installation structural integrity code compliance and environmental benefits. Wood has an almost unlimited useful life span if protected from ultraviolet UV light moisture fire and insect attack. Whereas most fires occurring in modern wood structures are the result of human error and cannot be totally prevented by good design and construction techniques ultraviolet degradation moisture problems and insect attack can be virtually eliminated by proper design construction and routine maintenance. Every element of the structure must be protected from each of the hazards mentioned above. Traditional framing and construction techniques do a good job of providing protection for most building elements. Many elements of traditional construction that we take for granted are there for the express purpose of providing the permanence that we have come to expect in wood structures. Roof overhangs for example keep rainwater and direct sunlight off the walls of the structure. The roof overhangs also minimize the amount of water that enters the ground adjacent to basement or crawl spaces. However designers often are unaware of the real purpose of such traditional building elements and treat them as mere architectural features. Once they are perceived as an architectural feature they may be eliminated at the whim of the designer. In the case of the example given above once the roof overhang is removed to save money or alter the look of the structure the protection it would have provided is also eliminated. Some of the consequences of the seemingly insignificant act of reducing or removing .

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