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Investigation of a Permanent and/or Emergency Seismic Retrofit Technique for RC Columns and Walls

RC 柱和墙的永久和/或紧急抗震改造技术研究

基本信息

批准号：
14350306
负责人：
YAMAKAWA Tetsuo
金额：
$ 10.82万
依托单位：
University of the Ryukyus
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350306/
关键词：
Seismic retrofit technique High strength steel bar Prestress Emergency retrofit RC columns with secondary walls Active transverse confinement Shear reinforcement Axial compression test 耐震補強応急補強付着割裂性状曲げ性状中心圧縮性状切り鋼板壁付き柱高

项目摘要

The development of permanent and/or emergency seismic retrofit technique is a common issue in earthquake hazard field all over the world, and it will be an important topic for the twenty-first century. A large variety of walls, such as, shear walls, spandrel walls and wing walls are often constructed in low-rise or medium height RC frame buildings in Japan. On the other hand, it is well known that transverse confinement of concrete contributes to the enhancement of strength and ductility of concrete. Considering this fact, a seismic retrofit technique of RC columns only or RC columns attached with secondary walls, such as, spandrel or wing walls, by utilizing pre-tensioned high strength steel bars, steel plates and steel angles were proposed in this research. Because of pre-tensioning, the method generates active confinement in addition to conventional shear reinforcement and passive confinement. Furthermore, as an emergency retrofit of the earthquake-damaged RC columns, this method se … More ems to be suitable, because the seismic retrofit can be conveniently and rapidly applied without heavy machinery as a dry construction method. The main research results are summarized as follows :1)By using PC rods and corner pieces through which tensile force was applied, the seismic retrofit of the independent RC column was proposed. This retrofit converts the extreme short column which causes the brittle shear failure into the flexural yielding column which is rich in the ductility.2)In addition to the steel plates or angles, the tensile force applied into PC rod which is directly united firmly around the column surface, the elastoplastic behavior of the retrofitted column under high axial force can be improved drastically.3)The reinforcement which improves not only the ductility but also the both strength and ductility for columns with secondary walls and framed shear walls was proposed.4)The method which reinforces the independent column by applying tensile force into the PC rod, is the dry method. Considering this fact, this reinforcement can also be applied effectively to the emergency retrofit of RC column and remedial work immediately after the earthquake disaster.5)A fiber model analysis including nonlinear shear force-distortion relationship was also tried and analytical examples were presented.6)Axial compression, pure bending and bond behavior of RC columns retrofitted by pre-tensioned PC rods were investigated and the effect of PC rod prestressing was recognized through the loading tests. Less

永久性和/或紧急抗震加固技术的发展是世界地震灾害领域的共同课题，也将是21世纪的重要课题。在日本，低层或中等高度的钢筋混凝土框架建筑中经常建造剪力墙、挑墙和翼墙等种类繁多的墙体。另一方面，众所周知，混凝土的横向约束有助于提高混凝土的强度和延性。鉴于此，本文提出了采用先张法高强钢筋、钢板和角钢加固钢筋混凝土柱或附加次墙的钢筋混凝土柱的抗震加固技术。由于预张拉，该方法除了产生传统的剪力钢筋和被动约束外，还产生了主动约束。此外，作为对地震损坏的钢筋混凝土柱的紧急加固，该方法采用…更适合EMS，因为抗震改造可以方便、快速地应用，而不需要重型机械作为一种干燥的施工方法。主要研究成果如下：1)采用PC杆和角片施加张拉力的方法，对钢筋混凝土独立柱进行抗震加固。这种加固将导致脆性剪切破坏的极短柱转变为延性较强的受弯屈服柱。2)除了钢板或角钢外，直接施加在PC杆上的拉力牢牢地结合在柱表面，可以显著提高柱在高轴力下的弹塑性性能。3)提出了一种不仅提高了次墙和框架剪力墙柱的延性，而且提高了强度和延性的配筋方法。4)对独立柱采用干法加固。5)尝试了考虑剪力-变形非线性关系的纤维模型分析，并给出了分析算例。6)研究了先张法PC筋加固钢筋混凝土柱的轴压、纯弯曲和粘结性能，并通过加载试验验证了预应力筋对加固效果的影响。较少