Earthquake Engineering


Wanganui Memorial Hall Earthquake Analysis

WanganuiHall 400
A site specific seismic geotechnical investigation was undertaken for an historic 1950s building in Wanganui. In-situ and laboratory testing included seismic SCPTu soundings to determine shear wave velocities of the subsoils for analysis of the natural period and an assessment of subsoil class in accordance with AS/NZS1170.5 for geotechnical and structural seismic evaluation. An analysis of liquefaction potential was carried out, together with an estimation of the liquefaction induced settlement and lateral spreading for the serviceability (SLS) and ultimate (ULS) limit states earthquake return periods. Recommendations on refurbishment and strengthening options for the foundations were given, which included provisions for ground improvement.


ASB Bank Head Office, North Wharf, Auckland

ASBBuilding 400
Geotechnical investigation of brownfield reclamation site for $250,000,000 development comprising two adjacent six to eight storey buildings. Field investigations involved machine boreholes and test pits with in-situ and laboratory testing, and site seismicity liquefaction settlement and lateral spreading assessments were undertaken. Piled foundation options included driven steel H-piles and cast in-situ piles designed by the Pells method. RILEY supervised the foundation piles (using CAPWAP testing) and roading subgrade construction leading to final certification.

 


Sarjeant Gallery, Wanganui

Sarjeant Gallery 400
Site specific seismic geotechnical investigation for historic early 1900s building. An integrated extension to the original building was proposed requiring geotechnical input to the structural analysis of the dynamic response. Seismic SCPTu soundings were used to determine shear wave velocities of the subsoils for analysis of the natural period and an assessment of subsoil class in accordance with AS/NZS1170.5.  An analysis of liquefaction potential was carried out, together with an estimation of the liquefaction induced settlement and lateral spreading for the serviceability (SLS) and ultimate (ULS) limit states earthquake return periods. Design and construction recommendation were given.

 


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