A STUDY ON THE FAILURE OF RC PIER UNDER THE IMPULSIVE VERTICAL SEISMIC LOAD

冲击竖向地震荷载作用下钢筋混凝土桥墩破坏研究

• 批准号: 11450177
• 负责人: OHTA Toshiaki
• 金额: $ 7.3万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450177/
• 关键词: impulsive vertical load; push-up impact test; circumferential crack; stress wave; fiber reinforced concrete

This research deals with a fundamental study on the damage of reinforced concrete (RC) column by the vertical earthquake load. First, the push-up apparatus was developed in order to reappear the circumferential crack phenomenon of RC pier in 1995 Hyogo-ken Nanbu earthquake. The followings were confirmed from the impulsive push-up experiments (1) Impulsive vertical motion during the earthquake could induce the circumferential crack of RC pier, (2) A circumferential crack was occurred by the tensile force due to the inertia force of negative acceleration and surcharge weight.Next, high-speed horizontal loading tests were performed on the damaged RC columns after the push-up impact test in order to examine the influence of circumferential crack on the strength and ductility. It was found that the ultimate strength and deformability of damaged specimens were about 10〜17% and 15〜40% less than undamaged specimens, respectively. Finally, the effect of various reinforcements (steel jacket, carbon fiber, etc) under the impulsive vertical load were examined, and recognized that fiber reinforcement could be the same effective as steel jacket reinforcement to the vertical earthquake load.

本文对钢筋混凝土柱在竖向地震荷载作用下的损伤进行了初步研究。首先，为了重现1995年兵库县南部地震中钢筋混凝土桥墩的周向裂缝现象，研制了推举装置。脉冲推举试验证实：(1)地震作用下的脉冲垂直运动可诱发钢筋混凝土桥墩的周向裂缝；(2)负加速度和附加重量的惯性力所产生的拉力可诱发周向裂缝。其次，在进行上推冲击试验后，对损伤RC柱进行高速水平加载试验，考察周向裂纹对强度和延性的影响。结果表明，损伤试件的极限强度和变形能力分别比未损伤试件低10 ~ 17%和15 ~ 40%。最后，考察了不同加固措施（钢夹套、碳纤维等）在竖向冲击荷载作用下的效果，认为纤维加固与钢夹套加固在竖向地震荷载作用下的效果相同。

项目成果

白石博文,別府万寿博,香月智,石川信隆: "衝撃的突き上げを受けるRC橋脚の模型の破壊性状について"第25回関東支部技術研究発表会概要集. 112-113 (1998)

Hirofumi Shiraishi、Manjuhiro Beppu、Satoshi Kazuki、Nobutaka Ishikawa：“关于受冲击抬升作用的 RC 桥墩模型的断裂特性”第 25 届关东分会技术研究报告摘要集 112-113 (1998)。

別府万寿博,香月智,石川信隆,宮本文穂: "衝撃的上下動によるRC橋脚模型の輪切り状ひび割れに及ぼす帯鉄筋の影響に関する実験的考察"第3回都市直下地震災害総合シンポジウム論文集. 251-254 (1998)

别府Manjuhiro、Satoshi Kazuki、Nobutaka Ishikawa、Fumiho Miyamoto：“环向钢筋对脉冲垂直运动引起的RC桥墩模型中环形裂缝影响的实验研究”第三届城市内陆地震灾害综合研讨会论文集.251 -254 (1998)

別府万寿博,香月智,石川信隆,宮本文穂: "軸衝撃問題における波動解析と振動解析の等価性に関する検討"第27回関東支部技術研究発表会講演概要集. 152-153 (2000)

别府Manjuhiro、Satoshi Kazuki、Nobutaka Ishikawa、Fumiho Miyamoto：“轴冲击问题中波浪分析和振动分析的等效性研究”第27届关东分会技术研究会议演讲摘要152-153（2000）。

別府万寿博,原田耕司,香月智,石川信隆: "衝撃突き上げを受けるRC橋脚モデルのひび割れ発生メカニズム"土木学会第55回年次学術講演会概要集. I-A343(CD-ROM). (2000)

别府万寿宏、原田幸二、一木聪、石川信孝：《冲击抬升作用下RC桥墩模型的裂纹产生机制》日本土木工程学会第55届年会学术会议摘要集I-A343（CD-ROM）。 .2000）

別府万寿博,香月智,石川信隆,宮本文穂: "RC橋脚の地震時輪切り状ひびわれ発生に関する実験的考察"第2回阪神・淡路大震災に関する学術講演会論文集. 213-218 (1997)

别府万寿宏、一木聪、石川信孝、宫本文穗：“地震时RC桥墩出现环状裂缝的实验研究”第二届阪神淡路大地震学术会议论文集213-218（1997）。