Challenge

The project involved a multi-storey office development combining a newly constructed wing with the seismic retrofit and remodeling of an existing building. The key challenge was to ensure structural integrity and code compliance across both components, each with distinct design constraints. The existing structure required careful assessment of seismic vulnerabilities and integration with the new build, while maintaining architectural intent and minimizing disruption to ongoing operations.

Approach

I undertook a comprehensive peer review of the structural design, focusing on evaluated design assumptions, load paths, lateral systems, and foundation strategies. Verified compliance with NZ Building Code and relevant standards. Reviewed seismic assessment methodology, retrofit strategy (including diaphragm performance and new bracing systems), and compatibility with the new structure. Assessed material condition and prior modifications. Interface Detailing: Scrutinized connections between old and new elements, ensuring differential movement, stiffness transitions, and load transfer were adequately addressed. Documentation and Certification: Delivered a formal peer review report with marked-up drawings and recommendations for PS2 sign-off.

Outcome

The peer review identified refinements that enhanced seismic resilience, clarified load paths, and improved constructability. The design team incorporated these recommendations, resulting in a robust, compliant structural solution. The project proceeded with confidence toward building consent and construction, with clear documentation supporting certification and long-term performance.