Secular Changes of the Bending Strength of Members in Wooden Dam for Soil Conservation

Abstract

It is very important for designing the safety of a timber structure to evaluate a strength durability of wood. Especially, the influence such as water is received easily for timbers used in outdoor, and there are a lot of use at harsh terms. In this study, the relation between a pilodyn driving depth and a bending strength was investigated, to develop the technique for presuming the strength deterioration by a simple method for members of a wooden dam for soil conservation that had been build in Kyoto Prefecture since 1999. A wooden dam for soil conservation has divided into two parts in wings set up by ground and counduit in state of often flood. Therefore, the feature of the strength deterioration in these two parts was experimentally confirmed. As a result, we found followings, 1) the increase speed of wings of a pilodyn driving depth is faster than that of a counduit. 2) there is a correlation between a pilodyn driving depth, the bending strength, and the young's modulus. 3) the strength deterioration can be presumed by using these findings in the maintenance work.