New crack width control design method for continuous composite girder bridges accounting for initial crack state

考虑初始裂纹状态的连续组合梁桥裂缝宽度控制新设计方法

• 批准号: 15560402
• 负责人: NAGAI Masatsugu
• 金额: $ 2.24万
• 依托单位: Nagaoka University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560402/
• 关键词: continuous composite girder; concrete; crack; initial crack st; stabilized crack state; control design; reinforcing bars; durability; コンクリート床版; ひび割れ幅制御設計; 初期ひび割れ状態; 安定ひび割れ状態

In this research, we proposed a new crack width control design method in continuous composite girder bridges. Cracking state is divided into the following three states, namely ; crack occurrence (the sum of concrete stress due to shrinkage and vehicle loading reaches tensile strength of the concrete), initial cracking (cracks appear successively), stabilized crack state (no crack initiation is observed and crack width starts increasing). Depending on the crack states, the formulae evaluating the crack width are presented. In addition, the stress in reinforcing bars is also proposed. The validity of the proposed new design method is confirmed through experimental research.

本研究提出了一种新的连续组合梁桥裂缝宽度控制设计方法。开裂状态分为以下三种状态，即：裂缝发生（由于收缩和车辆荷载引起的混凝土应力之和达到混凝土的抗拉强度）、初始开裂（裂缝相继出现）、稳定裂缝状态（未观察到裂缝萌生且裂缝宽度开始增加）。根据不同的裂缝状态，给出了裂缝宽度的计算公式。此外，还提出了钢筋应力的计算方法.通过实验研究证实了所提出的新设计方法的有效性。

项目成果

Evaluation of crack width of concrete slab and stress of reinforcing bar in continuous composite girder bridges

连续组合梁桥混凝土板裂缝宽度和钢筋应力评估

• 发表时间: 2004
• 期刊: Journal of Structural and Earthquake Engineering No.759/I-67
• 作者: M.Nagai;Y.Okui;E.Iwasaki
• 通讯作者: E.Iwasaki

Q.Z.Kahn, T.Honda, Y.Okui, M.Nagai: "A method for crack width evaluation of continuous composite bridges accounting for shear-lag effect"土木学会論文集. No.738/I-64. 37-47 (2003)

Q.Z.Kahn、T.Honda、Y.Okui、M.Nagai：“考虑剪力滞效应的连续复合材料桥梁裂缝宽度评估方法”日本土木工程师学会会刊第 738/I-64 号。 37-47（2003年）

A method for crack width evaluation of continuous composite bridges accounting for shear-lag effect

考虑剪力滞效应的连续组合桥梁裂缝宽度评估方法

• 发表时间: 2003
• 期刊: Journal of Structural and Earthquake Engineering, JSCE No.738/I-64
• 作者: Q.Z.Kahn;T.Honada;Y.Okui;M.Nagai
• 通讯作者: M.Nagai

Effective width formula of concrete slabs for crack with evaluation in continuous composite bridges

连续组合桥混凝土板裂缝有效宽度计算公式及评价

• 发表时间: 2005
• 期刊: Journal of Structural and Earthquake Engineering No.780/I-70
• 作者: Y.Okui;T.Honda;Q.Z.Kahn;M.Nagai
• 通讯作者: M.Nagai

中本啓介, 長井正嗣, 奥井義昭, 岩崎英治, 細見雅夫: "負曲げを受ける合成桁のひび割れ挙動に関する実験的研究"土木学会構造工学論文集. Vol.49A. 1143-1152 (2003)

Keisuke Nakamoto、Masashi Nagai、Yoshiaki Okui、Eiji Iwasaki、Masao Hosomi：“负弯复合材料梁开裂行为的实验研究”日本土木工程师学会结构工程学报第 49A 卷（2003 年）。 ）