Bending and Panel Shearing Deterioration of Plywood Used for the Floor Sheathing for a Long Period

作者：Furuta Naoyuki^*; Hirabayashi Yasushi; Hirai Takuro

来源：Mokuzai Gakkaishi, 2013, 59(5): 287-297.

DOI：10.2488/jwrs.59.287

• structural plywood
• concrete form plywood
• accelerated aging tests
• bending strength
• shear strength

To examine the durability of plywood used in actual houses, we investigated the bending and panel shear properties of floor sheathing plywood extracted from eight houses in Hokkaido, all of which were classified as Type 1 plywood according to the Japanese agricultural standard (JAS). Furthermore, we examined the strength of new control plywood after accelerated aging treatments, and we compared it with the deterioration of actual use. Both bending properties and panel shear properties of plywood used in actual houses almost exceeded the JAS requirements. We estimated the retention of these properties of the used plywood on the basis of the properties of the new control plywood. The retention of strength was lower than that of elasticity, and this tendency agreed with the results of accelerated aging tests of the control plywood. By comparing the relation between boiling cycles or durations of use and retention of these properties, we could calculate the durations of use that causes strength deterioration equal to one boiling cycle.

• 出版日期2013