IMPROVING THE DYNAMIC PERFORMANCE OF PRELOADED AND PRESTRESSED MECHANICALLY REINFORCED BACKFILL BY USING A RATCHET CONNECTION
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概要
- 論文の詳細を見る
A series of laboratory model shaking table tests were performed to evaluate improvement of the dynamic performance of mechanically reinforced soil structures that are vertically preloaded and prestressed by using a ratchet connection for the tie rods. The preloading and prestressing (PLPS) procedure was originally developed to substantially decrease the residual settlement at the top of backfill subjected to long-term live load such as traffic load. It is shown that the maintenance of high prestress in the backfill is also essential to substantially reduce the shear and bending deformation as well as vertical compression of reinforced backfill subjected to dynamic load. For relatively slender reinforced backfill structures, the maintenance of high prestress is particularly important to restrain the occurrence of large bending deformation of backfill. For these purposes, it is proposed that the top end of the tie rods be fixed to the crest of the structure by using a ratchet connection, which allows free compression of backfill at nearly constant prestress while mechanically not allowing any expansion of backfill. It is suggested that, to avoid a resonant or nearresonant state during seismic loading, the initial value of the natural frequency f_n of a given structure be designed to be sufficiently higher than the anticipated predominant frequency f_p of given seismic load, while the f_n value during dynamic loadine is maintained at a higher valve than the f_p value by using a ratchet connection.
- 社団法人地盤工学会の論文
- 2003-04-15
著者
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内村 太郎
東大 大学院工学系研究科
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内村 太郎
University of Tokyo
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龍岡 文夫
University of Tokyo
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篠田 昌弘
Integrated Geotechnology Institute Limited,formerly Graduate Student,University of Tokyo
関連論文
- VERTICAL AND HORIZONTAL LOADING TESTS ON FULL-SCALE PRELOADED AND PRESTRESSED GEOGRID-REINFORCED SOIL STRUCTURES
- 補強材剛性が補強土構造物の供用時の変形に与える影響
- ジオシンセティックス補強材の設計破断強度におけるクリープ低減係数の意味について
- PERFORMANCE OF A PRELOADED-PRESTRESSED GEOGRID-REINFORCED SOIL PIER FOR A RAILWAY BRIDGE
- IMPROVING THE DYNAMIC PERFORMANCE OF PRELOADED AND PRESTRESSED MECHANICALLY REINFORCED BACKFILL BY USING A RATCHET CONNECTION
- INCREASING THE STIFFNESS OF MECHANICALLY REINFORCED BACKFILL BY PRELOADING AND PRESTRESSING
- 免震基礎としてのPLPS補強盛土の性能に関わる条件
- セメント改良粒調砕石盛土中のジオグリッド補強材の引抜き試験
- 補強土構造物の定荷重および繰返し荷重による変形特性
- 免震基礎としてのPLPSジオテキスタイル補強盛土の振動台実験
- 補強土工法における地震エネルギー消費--免震構造としてのPLPSジオテキスタイル補強土 (特集 基礎構造における震動制御の工夫)
- PL・PS工法の新しい展開 (特集 擁壁・補強土壁工法)
- セメント改良された軟弱粘土地盤の剛性の評価(固結工法による地盤改良を用いた構造物基礎)
- PL・PS補強土橋脚の鉛直繰返し・クリープ載荷試験
- ジオグリッドの時間依存強度変形特性とその構成モデルの検討
- 補強砂の安定および定体積直接せん断試験(『地盤工学会論文報告集』Vol.40,No.4 (2000年8月発行)掲載論文の概要)
- CONSTANT PRESSURE AND CONSTANT VOLUME DIRECT SHEAR TESTS ON REINFORCED SAND
- PL・PS補強盛土の長期計測結果と圧縮量の予測
- PRELOADED AND PRESTRESSED REINFORCED SOIL
- 補強砂の定圧一面せん断試験における強度発現機構
- 東京大学 社会基盤学専攻の海外インターンシップ
- 4.2 地盤補強(第15回国際地盤工学会議)
- 4.地盤改良と補強(第15回国際地盤工学会議)
- ケンブリッジ大学でのモニタリング技術研究(寄稿)
- 地盤工学会研究奨励賞を受賞して(学会活動から)
- PL・PS補強土橋脚の施工と載荷試験 (特集 鉄道における最近の基礎工技術)
- STABILITY ANALYSIS FOR FOOTINGS ON REINFORCED SAND SLOPES
- 東北地方太平洋沖地震による福島県および栃木県の斜面崩壊について