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DESIGN METHOD FOR SPC COMPOSITE GIRDER BRIDGE AND THE GIRDER BRIDGE
PROBLEM TO BE SOLVED: To provide a rational design method for an SPC composite girder bridge capable of appropriately evaluating a steel frame material, the steel frame material being embedded on a compression side of a cross-section of a main girder of a girder bridge, for keeping the girder height low.SOLUTION: A main girder design method is for an SPC composite girder bridge having a steel frame material placed continuously along a longer-side direction as a compression material in a cross-section of a main girder 2, and prestress is applied on the main girder by tensioning and fixing PC cables 15, 15a disposed at required locations. The design method comprises the following steps for: calculating an actual Young's modulus ratio (n=Es/Ec) of the cross-section of the main girder based on a Young's modulus of the steel frame material (Es) and a Young's modulus of concrete (Ec); converting a cross-sectional area of the steel frame material (As) into an equivalent concrete cross-sectional area (Ac'=(n-1)*As) using the actual Young's modulus ratio; adding an increased concrete cross-sectional area on the compression side to the equivalent cross-sectional area (Ac'), assuming the outcome as a total concrete cross-section for the design, and calculating various constants for the cross-section; and checking cross-sectional stress using the calculated constants for the cross-section.SELECTED DRAWING: Figure 9
【課題】桁高さを低くするために桁橋の主桁断面の圧縮側に鉄骨鋼材を埋設した場合に、鉄骨鋼材を適切に評価し合理的なＳＰＣ合成桁橋の設計方法を提供する。【解決手段】主桁２の断面において、圧縮材として鉄骨鋼材が長手方向に沿って連続的に配置されると共に、所要の位置に配置されたＰＣケーブル１５、１５ａを緊張定着することにより主桁にプレストレスが付与されるＳＰＣ合成桁橋の主桁設計方法であって、主桁の断面において、鉄骨鋼材のヤング係数（Ｅｓ）とコンクリートヤング係数（Ｅｃ）によって実ヤング係数比（ｎ＝Ｅｓ／Ｅｃ）を算定し、実ヤング係数比を用いて鉄骨鋼材の断面積（Ａｓ）をコンクリート等価断面積（Ａｃ′＝（ｎ−１）・Ａｓ）に換算し、この等価断面積（Ａｃ′）を圧縮側のコンクリート断面積増加分を付け加えて設計上のコンクリート総断面として断面諸定数を計算し、算出された断面諸定数を用いて断面応力度の照査を行う。【選択図】図９
DESIGN METHOD FOR SPC COMPOSITE GIRDER BRIDGE AND THE GIRDER BRIDGE
PROBLEM TO BE SOLVED: To provide a rational design method for an SPC composite girder bridge capable of appropriately evaluating a steel frame material, the steel frame material being embedded on a compression side of a cross-section of a main girder of a girder bridge, for keeping the girder height low.SOLUTION: A main girder design method is for an SPC composite girder bridge having a steel frame material placed continuously along a longer-side direction as a compression material in a cross-section of a main girder 2, and prestress is applied on the main girder by tensioning and fixing PC cables 15, 15a disposed at required locations. The design method comprises the following steps for: calculating an actual Young's modulus ratio (n=Es/Ec) of the cross-section of the main girder based on a Young's modulus of the steel frame material (Es) and a Young's modulus of concrete (Ec); converting a cross-sectional area of the steel frame material (As) into an equivalent concrete cross-sectional area (Ac'=(n-1)*As) using the actual Young's modulus ratio; adding an increased concrete cross-sectional area on the compression side to the equivalent cross-sectional area (Ac'), assuming the outcome as a total concrete cross-section for the design, and calculating various constants for the cross-section; and checking cross-sectional stress using the calculated constants for the cross-section.SELECTED DRAWING: Figure 9
【課題】桁高さを低くするために桁橋の主桁断面の圧縮側に鉄骨鋼材を埋設した場合に、鉄骨鋼材を適切に評価し合理的なＳＰＣ合成桁橋の設計方法を提供する。【解決手段】主桁２の断面において、圧縮材として鉄骨鋼材が長手方向に沿って連続的に配置されると共に、所要の位置に配置されたＰＣケーブル１５、１５ａを緊張定着することにより主桁にプレストレスが付与されるＳＰＣ合成桁橋の主桁設計方法であって、主桁の断面において、鉄骨鋼材のヤング係数（Ｅｓ）とコンクリートヤング係数（Ｅｃ）によって実ヤング係数比（ｎ＝Ｅｓ／Ｅｃ）を算定し、実ヤング係数比を用いて鉄骨鋼材の断面積（Ａｓ）をコンクリート等価断面積（Ａｃ′＝（ｎ−１）・Ａｓ）に換算し、この等価断面積（Ａｃ′）を圧縮側のコンクリート断面積増加分を付け加えて設計上のコンクリート総断面として断面諸定数を計算し、算出された断面諸定数を用いて断面応力度の照査を行う。【選択図】図９
DESIGN METHOD FOR SPC COMPOSITE GIRDER BRIDGE AND THE GIRDER BRIDGE
ＳＰＣ合成桁橋の設計方法およびその桁橋
KUROSAWA RYOHEI (author)
2016-02-08
Patent
Electronic Resource
Japanese
IPC:
E01D
BRIDGES
,
Brücken
Construction method of girder composite rahmen bridge and Girder composite rahmen bridge
| European Patent Office | 2019
| Engineering Index Backfile | 1923