Abstract
For the purpose of increasing the store of data regarding shear load factors for horizontal diaphragms sheathed with particleboard (PB) of Japanese conventional wooden houses, racking tests were conducted for two types of floors differing in joist intervals and for two types of attic horizontal diaphragms differing in nail type and edge distance. A floor sheathed with JIS 18M type 15 mm thick PB under in-line nailing with a N50 nail, an interval of 150 mm and edge distance of 12 mm was found to possess a shear load factor of 2.3 for a joist interval of 455 mm. Shortening the joist interval from 455 to 303 mm increased the yield load 1.27 times and the ultimate load 1.35 times because of using approximately 1.4 times the amount nails, and this resulted in increase of the shear load factor from 2.3 to 2.9. An attic horizontal diaphragm sheathed with JIS 18M type 12 mm thick PB under perimeter nailing with a N50 nail, interval of 150 mm and edge distance of 12 mm was found to possess a shear load factor of 2.8. Changing the specification of nailing from N50 to CN50 and the edge distance from 12 to 25 mm increased the yield load 1.14 times and the ultimate load 1.26 times, which resulted in an increase of the shear load factor from 2.8 to 3.6.
