Ryman Petone - Village Centre

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Ryman Petone - Village Centre

 

Submitted by:  Mitchell Vranjes Consulting Engineers

Owner:  Ryman Healthcare

Architect:  Ryman Healthcare

Consulting Engineer:  Mitchell Vranjes Consulting Engineers

Contractor:  Ryman Healthcare

Sub-contractors:  Opus International Consultants  /  Formstress/Stresscrete  /  Dynamic Isolation Systems (Reno Nevada)

 

Summary:

Several buildings are currently under construction at the Petone site, one of these is the Village Centre.

The building comprises five (5) suspended levels with below ground basement.

The site is located close to a fault line and the structure is relatively heavy consisting of precast walls, rib and timber infill suspended floors custom 1200 x 600 shell beams, brick veneer and a heavy roof. In addition we were challenged with a very high water table and liquefiable soils which required remediation and also the requirement to increase seismic loads by a further 30% due to an Importance Level of 3 (high occupation level).

Traditional elastic design using these parameters resulted in a relatively high seismic coefficient, well in excess of unity.

From previous building designs for Ryman throughout NZ we anticipated extreme design difficulty and very high uplift loads.

We also recognized that the traditional use of transfer beams supporting shear walls at basement level would not be possible unless Architectural configuration was changed significantly. This was not an option.

In summary we elected to design a Base Isolated structure.