Seismc Retrofitting Metrhods for Reinforced Concrete Structures

钢筋混凝土结构抗震加固方法

• 批准号: 11355020
• 负责人: MACHIDA Atsuhiko
• 金额: $ 19.33万
• 依托单位: Saitama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11355020/
• 关键词: Steel Jacketing; FRP sheet wrapping; Concrete jacketing; Shear capacity; Deformability; Lattice model; Wall-type pier; Electrostatic repair; じん性率; 有限要素解析; 軸引張力; FRPシート巻き付け補強; 曲げ降伏後のせん断破壊; 帯鉄筋量; 正負交番載荷実験; ポリアセタール繊維

(1)A program to analyze the region where retrofitting is needed to prevent buckling of longitudinal reinforcement was coded in concrete jacketing method and steel jacketing method.(2)When RC beams with vertical construction joint is strengthened with steel jacketing, diagonal cracking load is increased and shear force carried by the stirrups at the joint is increased. The same retrofitting effect is expected when prestressing force is introduced perpendicularly to the vertical joint.(3)In retrofitting of RC columns with FRP sheet wrapping method, four models to estimate strain of the wrapped sheet were constructed, and it was made possible to estimate ultimate displacement for the failure mode of sheet breakage.(4)In wrapping of poly-acethal fiber sheet, whose breakage strain is extremely high, the followings were made clear : the sheet does not rupture at a normal ultimate state; ultimate deformability is improved; shear capacity is also increased. A model to predict ultimate deformation was constructed for the failure modes without rupture of the sheet.(5)Local buckling behavior of reinforcement within buckling length calculated using elastic buckling theory was spatially averaged and combined with the static lattice model. Analysis on wall-type piers showed that this model can accurately trace the post-peak behavior.(6)In seismic retrofitting of wall-type piers, it was shown that the method in which intermediate confirming reinforcement is anchored with expanding agent is very effective.(7)The experimental results on durability of RC members repaired with electrostatic method showed that permeability coefficient is little lowered and carbonation rate coefficient is even decreased under

(1)编制了混凝土护套法和钢护套法纵向钢筋防屈曲需要加固区域分析程序。(2)竖向施工缝钢筋混凝土梁采用钢护套加固时，增大了斜裂缝荷载，增大了缝处箍筋所承受的剪力。当在垂直缝处垂直施加预应力时，预期同样的加固效果。(3)在钢筋混凝土柱FRP布包覆加固中，建立了4个包覆布应变估算模型，为FRP布破坏破坏模式的极限位移估算提供了可能。(4)在对断裂应变极高的聚乙醛纤维片材进行缠绕时，明确了以下几点：片材在正常极限状态下不破裂；提高了极限变形能力；抗剪能力也有所提高。建立了无破裂破坏模式下的极限变形预测模型。(5)将弹性屈曲理论计算的钢筋屈曲长度范围内的局部屈曲行为进行空间平均，并与静态点阵模型相结合。对壁式桥墩的分析表明，该模型能较准确地反映桥墩的峰后行为。(6)在墙型桥墩抗震加固中，采用膨胀剂锚固中间加固的方法是非常有效的。(7)经静电修复的钢筋混凝土构件耐久性试验结果表明，在静电修复下，渗透系数几乎没有降低，碳化率系数甚至有所降低

项目成果

辻 幸和, 杉山 隆文, 山口 光俊: "鉛直打継目を有するRCはりの鋼板被覆による補強効果"土木学会論文集. No,697/V-54. 179-192 (2002)

Yukakazu Tsuji、Takafumi Sugiyama、Mitsutoshi Yamaguchi：“钢板涂层对带有垂直锤接头的 RC 梁的加固效果”，日本土木工程师协会会刊，第 697/V-54 号（2002 年）。

Tomohiro MIKI: "Numerical Evaluation of RC Structural Dynamic Response Using Lattice Model"Proceedings of the 3rd Regional Symposium on Infrastructure Development in Civil Engineering. 629-634 (2000)

Tomohiro MIKI：“使用格子模型对 RC 结构动态响应进行数值评估”第三届土木工程基础设施发展区域研讨会论文集。

宮前俊之: "鋼板被覆した鉛直打継目を有するRCはりのせん断性状"土木学会第55回年次学術講演会講演概要集. V. CD-ROM (2000)

Toshiyuki Miyamae：“带有钢板涂层垂直射缝的RC梁的剪切性能”日本土木工程学会第55届年度学术会议摘要V.CD-ROM（2000年）。

長井宏平: "炭素繊維シートにより補強された部材のじん性率に与える帯筋の影響"耐震補強の評価に関する研究委員会報告書・論文集. (印刷予定).

Kohei Nagai：“箍筋对碳纤维板加固构件韧性的影响”抗震加固评估研究委员会的报告和论文集（待印）。

新保学幸: "連続繊維シート補強RC柱部材のじん性予測に関する研究"コンクリート工学年次論文報告集. Vol.23(発表予定). (2001)

新房孝之：“连续纤维板增强RC柱构件韧性预测研究”《混凝土工程年报》第23卷（待出版）。