A Study on the Strengthening of ASR Damaged Concrete Piers Using Prestressing Steel Wires

预应力钢丝加固ASR损伤混凝土桥墩的研究

基本信息

批准号：
09650504
负责人：
TORII Kazuyuki
金额：
$ 1.73万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

A new strengthening method with prestressing steel wires, which is named the PC confined method, has been developed especially for ASR damaged RC piers. Reinforced concrete columns, 300 mm in diameter and 900 mm high, were prepared in order to examine the effects of the prestressing force around the concrete column on the confinement of the cracks of concrete due to alkali-silica reaction and on the improvement of load-carrying capacity and ductility of damaged concrete columns.From the experimental results, it was concluded that the prestressing force given around the concrete column could effectively confine the cracks due to ASR and decrease the expansion of concrete. Thus, it was found that both the strength and ductility of damaged RC column was much improved by PC confined method. Based on the results of the laboratory test, the PC confined method was successfully adopted in the strengthening for ASR damaged RC piers of the Toyokawa bridge and the Kumakigawa bridge in Noto peninsula in Ishikawa prefecture in 1997 and 1998, respectively. The measurements on changes with time in the stress and strain of concrete in the piers of the Toyokawa bridge after strengthening by PC confined method are now monitored.

针对ASR损伤的钢筋混凝土桥墩，开发了一种新的预应力钢丝加固方法，即PC约束法。为了检验混凝土柱周围的预应力对限制碱硅反应引起的混凝土裂缝和改善荷载的效果，制备了直径 300 mm、高 900 mm 的钢筋混凝土柱。试验结果表明，在混凝土柱周围施加预应力可以有效限制ASR引起的裂缝，减少混凝土的膨胀。由此可见，PC约束法对受损RC柱的强度和延性都有很大改善。根据室内试验结果，1997年和1998年，石川县能登半岛丰川大桥和熊木川大桥的ASR损伤RC桥墩分别成功采用PC约束法加固。现对采用 PC 约束法加固后的丰川大桥桥墩混凝土应力和应变随时间的变化进行监测。

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Kazuyuki Torii, Yasunori Okuda, Kouji Ishii, Kinya Kubo: "Strengthening Method with Prestressing Steel Wires for ASR-damaged Reinforced Concrete Columns" Proc.of the 2nd Inter.RILEM/CSIRO/ACRA Conf.on Rehabilitation of Structures, Melbourne. 38-47 (1998)

Kazuyuki Torii、Yasunori Okuda、Kouji Ishii、Kinya Kubo：“针对 ASR 损坏的钢筋混凝土柱的预应力钢丝加固方法”Proc.of the 2nd Inter.RILEM/CSIRO/ACRA Conf.on Rehabilitation of Structures，墨尔本。