1 0 0 0 斜行型合板を用いた耐力壁の面内せん断性能
- 著者
- 河村 進 大畑 敬 村田 功二
- 出版者
- 公益社団法人 日本材料学会
- 雑誌
- 材料 (ISSN:05145163)
- 巻号頁・発行日
- vol.58, no.4, pp.280-285, 2009
- 被引用文献数
- 1 1
It is known that the shear performance of plywood depends on the grain direction of veneer sheets, and if veneer sheets are oriented 45 degree against the lateral sides, it indicates highest shear performance. Authors produced experimentally the diagonal plywood, which were laminated parallelogram veneers oriented diagonally against the lateral sides. The in-plane shear performance of the bearing wall, which joined diagonal plywood to the frame with the nail spaced 50mm to 150mm apart, was evaluated by racking test. When the nail space was shortened, load at yield point increased, but maximum load of diagonal plywood was almost equal to standard plywood. The comparable result was also obtained from the lateral nail resistance test.<br>In conjunction with this, shear strain distribution of panel was measured by digital image correlation (DIC), and approximate shear modulus of panel could be calculated from load-strain curve. Shear strain of diagonal plywood was lower than that of standard plywood. The bearing wall using diagonal plywood indicated large initial stiffness. As a result, it was concluded that bearing wall using diagonal plywood indicates higher reference shear strength. In order to increase the shear strength that is added to diagonal plywood, it is effective if the interval of nail is to some extent shorter than 150mm, which is the specification of wall index 2.5 of bearing wall using standard plywood. Shear modulus of full-sized diagonal plywood was about 4 times as much as that of standard plywood.
1 0 0 0 OA 労災における騒音による難聴の分類とその対策
- 著者
- 河村 進市
- 出版者
- Japan Audiological Society
- 雑誌
- AUDIOLOGY JAPAN (ISSN:03038106)
- 巻号頁・発行日
- vol.19, no.2, pp.121-128, 1976 (Released:2010-04-30)
- 参考文献数
- 40
騒音による難聴は許容基準以上から, 直ちに聴力損失を起す強さ, すなわち危険値までの騒音によって生じる。この範囲内の騒音環境下従業では, 慢性に生ずる職業性難聴の外, 一定の時期, 場所において急激に聴器自覚症の発生ないし増悪する急性音響 (騒音) 性聴器障害があり, 後者は1959年4月より日本では労災の対象となった。これら疾患の分類と対策の外, 特に現場の適性検査 (河村), 職業性難聴の治療基準としてのTTSなどについても言及した。一方50年近く固執されてきた難聴の障害等級は, 1975年9月より大幅に改正され (最低基準60dBが30dBへ), 補償は勿論, 職業性難聴の予防及び進行防止とも関連し, 大きな問題を提起するものと思われる。
1 0 0 0 OA 耳疾患と耳鳴類似周波数についての観察
- 著者
- 栗原 紘一 河村 進市 坂下 桂之助 浅井 政二郎
- 出版者
- Japan Audiological Society
- 雑誌
- AUDIOLOGY JAPAN (ISSN:03038106)
- 巻号頁・発行日
- vol.16, no.2, pp.46-50, 1973 (Released:2010-04-30)
- 参考文献数
- 17
- 被引用文献数
- 3
We investigated the frequency similarities of tinnitus in 150 patients (186 ears) and the relationship between the ear disease and the pitch of tinnitus.The tinnitus could be divided into three groups by the frequency similarity to pitch of tinnitus.1) Tinnitus in 24.1% cases was limited to the low frequency ranges between 125Hz and 800Hz.2) Tinnitus in 20.9% cases was limited to the mid-dle frequency ranges between 1KHz and 3KHz.3) Tinnitus in 55% cases was limited to the high frequency ranges between 4KHz and 8KHz.In an attempt of study on the relationship between the frequency similaritiy of tinnitus and the frequency of the lowest audible threshold, the following results have been obtained. Regardless to tinnitus of the low, middle or high frequency pitch, the most of cases showed the hearing inpairment in the higher frequencies on pure tone audiogram.
1 0 0 0 OA 光学的手法によるリアルタイム非接触振動計測法の開発と非破壊検査への応用
(1)非接触全視野非破壊試験法の開発とその応用:レーザシェアログラフィを用いた欠陥検知への有効性について検討した。また、超高速度カメラを用いた動的変位計測システムによる振動計測法の有効性を確認した。(2)常時微動計測に基づく構造同定及び健全度評価への応用:耐震補強前後の実橋脚を対象として、レーザドップラ速度計による振動試験とFE解析から振動モード同定を実施した。補強前後の固有振動数の変化を実振動計測および振動解析で確認することができた。