Seismic retrofit of existing SRC frames using rocking walls and steel dampers

doi:10.1007/s11709-011-0114-x

Front Arch Civil Eng Chin

2011, Vol. 5

Issue (3) : 259-266 https://doi.org/10.1007/s11709-011-0114-x

RESEARCH ARTICLE

Seismic retrofit of existing SRC frames using rocking walls and steel dampers

Akira WADA¹(

), Zhe QU², Shojiro MOTOYUI¹, Hiroyasu SAKATA¹

1. Structural Engineering Research Center, Tokyo Institute of Technology, Tokyo 152-8550, Japan; 2. Center for Urban Earthquake Engineering, Tokyo Institute of Technology, Tokyo 152-8550, Japan

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Abstract

A retrofit of an existing 11-story steel reinforced concrete frame that features the innovative use of post-tensioned rocking walls and shear steel dampers is presented. The main components of the retrofitting plan and important design considerations are described. The retrofitting system is expected to effectively control the deformation pattern of the existing structure and significantly reduce damage to the existing structure during major earthquakes.

Keywords building structure seismic retrofit rocking wall steel damper

Corresponding Author(s): WADA Akira,Email:wada@serc.titech.ac.jp

Issue Date: 05 September 2011

Cite this article:

Akira WADA,Zhe QU,Shojiro MOTOYUI, et al. Seismic retrofit of existing SRC frames using rocking walls and steel dampers[J]. Front Arch Civil Eng Chin, 2011, 5(3): 259-266.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-011-0114-x
https://academic.hep.com.cn/fsce/EN/Y2011/V5/I3/259

Fig.1 Basic components in a rocking wall system

Fig.2 The north views of G3 Building before and after the retrofit. (a) Existing; (b) retrofitted

Fig.3 Structural plan of the existing and retrofitted building

Fig.4 Cross section of rocking walls

Fig.5 Pin bearing at the bottom of the rocking walls

Fig.6 Details of the cast-iron bearing

Fig.7 Horizontal truss

Fig.8 Installed steel damper with a length of 1500 mm

Fig.9 Steel damper deformations and their hysteretic responses to cyclic loading []

Tab.1 Peak ground acceleration and velocity of the selected records

Fig.10 Ground motion records used in the analysis

Fig.11 Response spectra of the selected ground motion records

Fig.12 Story drift ratios of the structure before and after the retrofit

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