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Seismic Retrofit of a Heritage Building in Wellington Using Buckling Restrained Braces
A heritage building in Wellington, New Zealand (NZ) was classified as potentially earthquake-prone following an initial seismic assessment (ISA) by the Wellington City Council (WCC). The first four stories of the building were constructed originally in 1908 and an additional lightweight story was added in 1955 and altered in 1993. The building has a rectangular floor plan measuring 24 x 10.5 m. In the longitudinal direction, steel frame with solid unreinforced masonry (URM) infill walls provided resistance to seismic forces. In the transverse direction, perforated URM walls with large openings and nonductile concrete encased steel frames were used for both gravity and seismic load transfer. A detailed seismic assessment (DSA) of the building structure confirmed seismic capacity of the building in excess of 100% of New Building Standards (%NBS) in the longitudinal direction. However, in the transverse direction, the structure, secondary components and non-structural components had a seismic capacity less than 34%NBS, hence the building was confirmed earthquake-prone in its current state under the NZ Building Act. Performance-based engineering was used to devise the seismic retrofit for the principle structure. To retrofit the principle building structure to 100%NBS in the transverse direction, new Buckling Restrained Braced (BRB) frames were designed to carry seismic load. A geotechnical investigation showed that the underlying soil was competent and thus soil-structure interaction (SSI), tie foundation beams and nonlinear analysis were used to obtain realistic demand and capacity for the building after seismic retrofitting. The BRB manufacturer was consulted and the BRB size distribution along the height was optimized. The construction of the seismic retrofit is currently underway.
Seismic Retrofit of a Heritage Building in Wellington Using Buckling Restrained Braces
A heritage building in Wellington, New Zealand (NZ) was classified as potentially earthquake-prone following an initial seismic assessment (ISA) by the Wellington City Council (WCC). The first four stories of the building were constructed originally in 1908 and an additional lightweight story was added in 1955 and altered in 1993. The building has a rectangular floor plan measuring 24 x 10.5 m. In the longitudinal direction, steel frame with solid unreinforced masonry (URM) infill walls provided resistance to seismic forces. In the transverse direction, perforated URM walls with large openings and nonductile concrete encased steel frames were used for both gravity and seismic load transfer. A detailed seismic assessment (DSA) of the building structure confirmed seismic capacity of the building in excess of 100% of New Building Standards (%NBS) in the longitudinal direction. However, in the transverse direction, the structure, secondary components and non-structural components had a seismic capacity less than 34%NBS, hence the building was confirmed earthquake-prone in its current state under the NZ Building Act. Performance-based engineering was used to devise the seismic retrofit for the principle structure. To retrofit the principle building structure to 100%NBS in the transverse direction, new Buckling Restrained Braced (BRB) frames were designed to carry seismic load. A geotechnical investigation showed that the underlying soil was competent and thus soil-structure interaction (SSI), tie foundation beams and nonlinear analysis were used to obtain realistic demand and capacity for the building after seismic retrofitting. The BRB manufacturer was consulted and the BRB size distribution along the height was optimized. The construction of the seismic retrofit is currently underway.
Seismic Retrofit of a Heritage Building in Wellington Using Buckling Restrained Braces
Key Engineering Materials ; 763 ; 1097-1104
2018-02-14
8 pages
Article (Journal)
Electronic Resource
English
Seismic Retrofit of a Heritage Building in Wellington Using Buckling Restrained Braces
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