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seismic retrofi tting of RC columns with RC jackets and wing walls with different structural details

Earthquake Engineering and Engineering Vibration 2014年第2期13卷 279-292页

作者： Shuenn-Yih Chang ting-Wei Chen Ngoc-Cuong tran Wen-I Liao Department of Civil Engineering Taipei University of Technology

An original reinforced concrete(RC) column and four strengthened specimens, two with RC jackets and two with wing walls, were tested in this study. the original column specimen was designed to comply with older(pre-1999) design standards so that the usual detailing defi ciencies in existing school buildings in taiwan could be simulated. two different structural details were chosen to fabricate the full-scale specimens for each retrofi tting technique. the study confi rmed that either RC jacketing or the installation of wing walls with two different structural details can effectively improve the stiffness and strength of an existing column. RC jacketing shows a better improvement in energy dissipation and ductility when compared to the columns with wing walls installed. this is because the two RC jacketed columns experienced a fl exural failure, while a shear failure was found in the two columns with the wing walls installed, and thus led to a drastic decrease of the maximum lateral strengths and ductility. Since many factors may affect the installation of a post-installed anchor, it is better to use standard hooks to replace post-installed anchors in some specifi c points when using RC jacketing or installing wing walls.

关键词： RC jacketing installing wing wall seismic retrofi t non-ductile details post-installed anchors

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