Why Specialist Expertise is Crucial for Non-Structural Seismic Design

Why Specialist Expertise is Crucial

The field of seismic design for interiors, often referred to as Non-structural Elements (NSE) engineering, has emerged as a distinct and vital skillset in Australia and New Zealand. This specialisation addresses the complex demands of ensuring building services and internal fit-out components can withstand seismic forces, even if the primary structure remains intact.

The Rise of NSE Specialists

A number of specialist firms have developed deep expertise in this niche, having honed their craft over decades:

It is also worth mentioning the Specialist teams within the large consultancies.

They can be a bit harder to get hold of, but if you know the right people to contact, they also have the specialist expertise. The following large consultancies have strong specialist NSE teams:

The Pitfall of Generalist Approaches

In the current market, there's a trend of generalist structural engineers attempting to extend their services into interiors engineering. The reasoning often given is that since they already handle the superstructure, the interiors should be a simple extension. However, this perspective overlooks a fundamental difference in complexity:

Consider the contrast between superstructure and NSE engineering:

• Superstructure is complex engineering, but simple product choice. Superstructure engineering involves highly complex structural analysis and design, but often relies on a relatively simple selection of widely understood construction products (e.g., standard steel beams and connections). The challenge lies in the intricate calculations and large-scale forces involved.
• NSE is easier to engineer, but complex and proprietary product systems. NSE engineering in contrast involves comparatively simple analysis, but is characterised by an incredibly complex choice of products and systems. For example, selecting the correct bracing for a suspended ceiling requires an understanding of various proprietary systems, their specific performance under seismic load, and their interaction with other building services. Similarly, seismic restraint for HVAC ducting involves assessing diverse hangers, connections, and expansion joints, each with unique specifications and installation requirements.

Why Specialisation Matters

The "smarter, not stronger" philosophy in seismic design emphasises nuanced understanding over brute force. For non-structural elements, this means precise design and selection to ensure components can deform or move in a controlled manner during an earthquake, preventing catastrophic failures, injuries, or blocked egress routes. Generalists tend to lack the deep product knowledge and specific design methodologies required for this critical area. When you are used to working with 400UB’s, a half mm thick steel stud looks very small!

For superior quality, safety, and innovation in your building projects, particularly concerning the resilience of non-structural elements, specialised expertise is an advantage. We are happy to discuss the selection of an NSE consultant with you to ensure your project benefits from the most qualified expertise.  We’ll even refer our specialist competitors if that’s a better fit for you!

If you want to know more about how specialists like Brevity can provide expert knowledge on your interiors projects, click below to Schedule a Consultation.

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