The Experts below are selected from a list of 21 Experts worldwide ranked by ideXlab platform

Kyuichi Maruyama - One of the best experts on this subject based on the ideXlab platform.

  • evaluation method for shear capacity of rc members retrofitted with externally bounded Continuous Fiber Sheet
    CONCRETE LIBRARY INTERNATIONAL, 2001
    Co-Authors: Akihisa Kamiharako, Takumi Shimomura, Kyuichi Maruyama
    Abstract:

    This paper describes an evaluations method for the shear capacity of RC menbers retrofitted with externally bonded Continuous Fiber (CF) Sheets. The proposed method is based on coupled mechanical models. A simplified model calculates the opening of major diagonal cracks. A constitutive model of the interfacial zone between CF Sheet and concrete then calculates the bonding and debonding behavior of the CF Sheet. Since the evaluation is based on realistic mechanical assumptions, it can automatically distinguish between member failure models: "compression shear failure" and "CF Sheet rupture". The accuracy and applicability of the proposed method is verified using experimental data taken from the literature. It is demonstrated that the method is able to predict the shear capacity of member with higher accuracy than the equation used in the current design procedure.

  • a study on evaluation method for shear capacity of rc member retrofitted with externally bonded Continuous Fiber Sheet
    Doboku Gakkai Ronbunshu, 2000
    Co-Authors: Akihisa Kamiharako, Takumi Shimomura, Kyuichi Maruyama
    Abstract:

    本研究は, 連続繊維シートで補強されたコンクリート部材のせん断耐力を評価するための手法を提案するものである. 提案した手法は, 一軸引張付着試験より導出したシートとコンクリート間の付着構成モデルを用いて, せん断ひび割れを跨ぐシートの剥離過程を評価することにより終局時にシートが負担するせん断力を算定する方法である. 本法は, 従来の方法で用いられていたシートの種類による修正係数を用いる必要がないこと,「せん断圧縮破壊モード」と「シート破断モード」を合理的に区別してせん断耐力の評価を行えることが特長である. 既往の実験データを用いて提案手法の検証を行い, その適用性について論じた.

  • analysis of bond and debonding behavior of Continuous Fiber Sheet bonded on concrete
    Doboku Gakkai Ronbunshu, 1999
    Co-Authors: Akihisa Kamiharako, Takumi Shimomura, Kyuichi Maruyama, Hiroyuki Nishida
    Abstract:

    本研究は, コンクリートに接着した連続繊維シートの剥離挙動を数値計算で予測するための構成モデルについて検討するものである. 一軸引張試験で得られた連続繊維シートのひずみ分布よりシートとコンクリート間の付着応力と相対変位との関係を導き, これを弾性 ―軟化― 剥離型モデル, および弾性 ―剥離型モデルによりモデル化した. これら2種類のモデルを用いて一軸引張試験のシミュレーションを行い, その感度と適用性について論じた.

Akihisa Kamiharako - One of the best experts on this subject based on the ideXlab platform.

  • evaluation method for shear capacity of rc members retrofitted with externally bounded Continuous Fiber Sheet
    CONCRETE LIBRARY INTERNATIONAL, 2001
    Co-Authors: Akihisa Kamiharako, Takumi Shimomura, Kyuichi Maruyama
    Abstract:

    This paper describes an evaluations method for the shear capacity of RC menbers retrofitted with externally bonded Continuous Fiber (CF) Sheets. The proposed method is based on coupled mechanical models. A simplified model calculates the opening of major diagonal cracks. A constitutive model of the interfacial zone between CF Sheet and concrete then calculates the bonding and debonding behavior of the CF Sheet. Since the evaluation is based on realistic mechanical assumptions, it can automatically distinguish between member failure models: "compression shear failure" and "CF Sheet rupture". The accuracy and applicability of the proposed method is verified using experimental data taken from the literature. It is demonstrated that the method is able to predict the shear capacity of member with higher accuracy than the equation used in the current design procedure.

  • a study on evaluation method for shear capacity of rc member retrofitted with externally bonded Continuous Fiber Sheet
    Doboku Gakkai Ronbunshu, 2000
    Co-Authors: Akihisa Kamiharako, Takumi Shimomura, Kyuichi Maruyama
    Abstract:

    本研究は, 連続繊維シートで補強されたコンクリート部材のせん断耐力を評価するための手法を提案するものである. 提案した手法は, 一軸引張付着試験より導出したシートとコンクリート間の付着構成モデルを用いて, せん断ひび割れを跨ぐシートの剥離過程を評価することにより終局時にシートが負担するせん断力を算定する方法である. 本法は, 従来の方法で用いられていたシートの種類による修正係数を用いる必要がないこと,「せん断圧縮破壊モード」と「シート破断モード」を合理的に区別してせん断耐力の評価を行えることが特長である. 既往の実験データを用いて提案手法の検証を行い, その適用性について論じた.

  • analysis of bond and debonding behavior of Continuous Fiber Sheet bonded on concrete
    Doboku Gakkai Ronbunshu, 1999
    Co-Authors: Akihisa Kamiharako, Takumi Shimomura, Kyuichi Maruyama, Hiroyuki Nishida
    Abstract:

    本研究は, コンクリートに接着した連続繊維シートの剥離挙動を数値計算で予測するための構成モデルについて検討するものである. 一軸引張試験で得られた連続繊維シートのひずみ分布よりシートとコンクリート間の付着応力と相対変位との関係を導き, これを弾性 ―軟化― 剥離型モデル, および弾性 ―剥離型モデルによりモデル化した. これら2種類のモデルを用いて一軸引張試験のシミュレーションを行い, その感度と適用性について論じた.

Takumi Shimomura - One of the best experts on this subject based on the ideXlab platform.

  • evaluation method for shear capacity of rc members retrofitted with externally bounded Continuous Fiber Sheet
    CONCRETE LIBRARY INTERNATIONAL, 2001
    Co-Authors: Akihisa Kamiharako, Takumi Shimomura, Kyuichi Maruyama
    Abstract:

    This paper describes an evaluations method for the shear capacity of RC menbers retrofitted with externally bonded Continuous Fiber (CF) Sheets. The proposed method is based on coupled mechanical models. A simplified model calculates the opening of major diagonal cracks. A constitutive model of the interfacial zone between CF Sheet and concrete then calculates the bonding and debonding behavior of the CF Sheet. Since the evaluation is based on realistic mechanical assumptions, it can automatically distinguish between member failure models: "compression shear failure" and "CF Sheet rupture". The accuracy and applicability of the proposed method is verified using experimental data taken from the literature. It is demonstrated that the method is able to predict the shear capacity of member with higher accuracy than the equation used in the current design procedure.

  • a study on evaluation method for shear capacity of rc member retrofitted with externally bonded Continuous Fiber Sheet
    Doboku Gakkai Ronbunshu, 2000
    Co-Authors: Akihisa Kamiharako, Takumi Shimomura, Kyuichi Maruyama
    Abstract:

    本研究は, 連続繊維シートで補強されたコンクリート部材のせん断耐力を評価するための手法を提案するものである. 提案した手法は, 一軸引張付着試験より導出したシートとコンクリート間の付着構成モデルを用いて, せん断ひび割れを跨ぐシートの剥離過程を評価することにより終局時にシートが負担するせん断力を算定する方法である. 本法は, 従来の方法で用いられていたシートの種類による修正係数を用いる必要がないこと,「せん断圧縮破壊モード」と「シート破断モード」を合理的に区別してせん断耐力の評価を行えることが特長である. 既往の実験データを用いて提案手法の検証を行い, その適用性について論じた.

  • analysis of bond and debonding behavior of Continuous Fiber Sheet bonded on concrete
    Doboku Gakkai Ronbunshu, 1999
    Co-Authors: Akihisa Kamiharako, Takumi Shimomura, Kyuichi Maruyama, Hiroyuki Nishida
    Abstract:

    本研究は, コンクリートに接着した連続繊維シートの剥離挙動を数値計算で予測するための構成モデルについて検討するものである. 一軸引張試験で得られた連続繊維シートのひずみ分布よりシートとコンクリート間の付着応力と相対変位との関係を導き, これを弾性 ―軟化― 剥離型モデル, および弾性 ―剥離型モデルによりモデル化した. これら2種類のモデルを用いて一軸引張試験のシミュレーションを行い, その感度と適用性について論じた.

Futoshi Katsuki - One of the best experts on this subject based on the ideXlab platform.

  • new design method for seismic retrofit of bridge columns with Continuous Fiber Sheet performance based design
    Forth International Symposium on Fiber Reinforced Polymer Reinforcement for Reinforced Concrete StructuresAmerican Concrete Institute (ACI), 1999
    Co-Authors: Hiroshi Mutsuyoshi, T Ishibashi, M Okano, Futoshi Katsuki
    Abstract:

    In the aftermath of the 1995 Hyogo-Ken Nanbu Earthquake in which many severe failures of bridge piers occurred, numerous studies have been conducted on ways to retrofit existing RC columns and piers. As a result of this research, it has been found that Continuous Fiber Sheet offers a feasible means of retrofitting. Consequently, several design guidelines on the use of FRP Sheets for retrofitting highway, railway and subway structures have been proposed in recent years. The JSCE (Japan Society for Civil Engineers) Concrete Committee on FRP Sheet, which was setup in 1998, has been commissioned to establish a new design method for seismic retrofit of bridge columns and piers. It seeks to unify all the existing guidelines on a performance-based design concept. The new design method of shear strength and ductility of retrofitted RC structures using FRP Sheet are described and the design equations for shear strength and ductility are also presented.

Hiroshi Mutsuyoshi - One of the best experts on this subject based on the ideXlab platform.

  • new design method for seismic retrofit of bridge columns with Continuous Fiber Sheet performance based design
    Forth International Symposium on Fiber Reinforced Polymer Reinforcement for Reinforced Concrete StructuresAmerican Concrete Institute (ACI), 1999
    Co-Authors: Hiroshi Mutsuyoshi, T Ishibashi, M Okano, Futoshi Katsuki
    Abstract:

    In the aftermath of the 1995 Hyogo-Ken Nanbu Earthquake in which many severe failures of bridge piers occurred, numerous studies have been conducted on ways to retrofit existing RC columns and piers. As a result of this research, it has been found that Continuous Fiber Sheet offers a feasible means of retrofitting. Consequently, several design guidelines on the use of FRP Sheets for retrofitting highway, railway and subway structures have been proposed in recent years. The JSCE (Japan Society for Civil Engineers) Concrete Committee on FRP Sheet, which was setup in 1998, has been commissioned to establish a new design method for seismic retrofit of bridge columns and piers. It seeks to unify all the existing guidelines on a performance-based design concept. The new design method of shear strength and ductility of retrofitted RC structures using FRP Sheet are described and the design equations for shear strength and ductility are also presented.