Effect of moisture on creep fracture of full scale wooden structural materials

2016 Fiscal Year Final Research Report

• Project/Area Number: 25450254
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Wood science
• Research Institution: Utsunomiya University (2015-2016); Building Research Institute (2013-2014)
• Principal Investigator: Nakajima Shiro 宇都宮大学, 地域デザイン科学部, 教授 (00344010)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: クリープ破壊 / クリープ変形 / 製材 / 構造用単板積層材 / 実大材 / 標準状態 / 湿度変動環境下 / 粘弾性モデル

Outline of Final Research Achievements

The effect of the moisture on the creep fracture of full scale lumbers and full scale laminated veneer lumbers were clarified through the test results of the long term loading tests. The long term loading test was conducted in two different climates, the climate of the standard condition and the dry and humid cyclic climate. The creep fracture and the duration of time to failure was estimated by modeling the test specimens as small elements of viscoelastic materials.
Common to the both materials the duration of time to failure was shorter and the deformation was larger for the test specimens tested in the dry and humid cyclic climate. The test results were well estimated by the proposed model. Though the absolute deformation was not well estimated and this is an agenda for future research works.

Free Research Field

木質構造