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ジャケット式構造の耐震強化岸壁への適用

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川崎製鉄技報

KAWASAKI STEEL GIHO Vol.30 (1998) No.1

ジャケット式構造の耐震強化岸壁への適用

Application of Jacket Type Structures for High Seismic Resistant Quaywalls

石 原 謙 治(Kenji Ishihara) 平 本 高 志 (Takashi Hiramoto) 中 村 聖 三 (Shozo Nakamura) 要旨 : ジャケット式構造を岸壁に適用した場合の地震時の耐荷力特性を明らかにすることを目的 に,水平震度 kh 5 0.25 で試設計を行ったジャケット式岸壁に対して,水平震度 kh をパ ラメータに設定し,kh 5 0.20~0.28 の範囲で弾塑性骨組解析を実施し,以下の事項を確認 した。(1) ジャケット式岸壁に慣性力などの地震時水平荷重が作用した場合,トラス構造の 剛性が高いためこの部分が剛体的に水平変位を起こす。(2) 地震荷重が増すにつれ岸壁天端 での水平変位は増すがその値は小さく,全体構造が不安定化する傾向はみられない。(3) 一 部部材が塑性域に達するものの,構造物全体が崩壊などの致命的な破壊には至ることはな く,ジャケット式岸壁は地震時において十分な耐荷力を有する。 Synopsis :

In order to examine seismic loading capacity of jacket type quaywalls, trial designing of a quaywall and its elasto-plastic frame analysis in which horizontal seismic coefficient was adopted as an analysis parameter were carried out. The following results were obtained through the analysis. (1) The truss-shaped portion of the jacket type quaywall was not deformed so much because of the high rigidity of the portion. (2) Displacement at the top of the quaywall was not large and the jacket type quaywall, whose designed seismic coefficient kh is 0.25, did not show unstable behavior at kh 5 0.28. (3) Although some members became plastic, the jacket type quaywall did not collapse even if at kh 5 0.28 and showed enough loading capacity.

(c)JFE Steel Corporation, 2003

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