日本国内に自生するブナ科樹木のブナ科樹木萎凋病菌Raffaelea quercivoraに対する感受性を明らかにすることを目的とした．感受性が不明なアベマキ，カシワ，ナラガシワ，クリ，アカガシ，イチイガシ，シラカシ，ツクバネガシ，ツブラジイの9種と感受性が高いミズナラとコナラ，感受性が低いアラカシとスダジイの苗木に対してR. quercivoraの1点接種を行った．その結果，アベマキとカシワ，ナラガシワ，クリの接種部の横断面における非通水域の割合は，ミズナラやコナラとは有意差は認められず，アラカシやスダジイより有意に大きかった．したがって，これらの樹種はR. quercivoraに対し感受性が高いことが示唆された．

Beam-to-column connections of steel pier is tend to have stress concentration and causes fatigue crack in welding connects flange and web steel plate of beam and pier which is difficult to keep good welding quality. In 1982, crack damage on beam-to-column connection of a T-shape steel pier in Hanshin Expressway is detected for the first case. The damage was repaired by attaching ribs by welding. Another crack was detected on the welding of the ribs and repaired in 1995 but it was cracked again in 2002. In this study, finite element method analysis and stress frequency measurement are conducted to evaluate former and newly proposed retrofit method. Finally, retrofit existing stiffening ribs and patching steel plate with bolt was adopted.