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地盤液状化に対する埋設管の変位挙動解析

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川崎製鉄技報

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

地盤液状化に対する埋設管の変位挙動解析

Seismic Analysis of Buried Pipeline against Liquefaction Hazard 小池 武(Takeshi Koike) 今井 俊雄(Toshio Imai)

要旨 : 側方流動を受ける埋設管路の変位挙動を推定するための解析手法を開発した。解析対象は 直管，曲管，分岐管であり，地盤液状化にともなって発生した数メートル単位の側方流動 に対する管路系の弾塑性挙動を解析する理論式の定式化を行なった。直管については，管 材および周辺地盤の弾塑性特性，大変位挙動を考慮した解析手法を開発し，異形管につい ては，簡易解析手法を提案した。数値検討は，全塑性モーメントを超える材端曲げモーメ ントが作用した場合の曲管たわみ角や側方流動に対する分岐管枝管部の軸ひずみについて 行った。 Synopsis :

An analytical method has been developed to predict the structural behavior of buried pipelines which are suffering from lateral spreading in a liquefaction site. The elasto-plastic behavior of pipeline systems including straight pipe and geometrical piping which are installed in the liquefied ground is analyzed and theoretically formulated as a beam structural system. Frictional effect and soil reaction forces are taken into consideration in this analysis. Numerical calculation are conducted for bend pipes and tee-junctions.

(c)JFE Steel Corporation, 2003

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