Seismic Retrofitting of Existing Buildings

Hazard picture

Many existing buildings were constructed before current seismic codes were introduced and exhibit typical weaknesses: soft storeys, inadequately anchored masonry, insufficient connection between floors and load-bearing walls, and unsecured non-structural elements and plant. Even in regions of moderate seismicity such as Switzerland, this creates significant loss potential in moderate to strong earthquakes.

Retrofitting measures

Retrofitting is carried out on a risk-based, staged approach: following a condition assessment and classification within the governing seismic zone, targeted bracing, anchoring and strengthening of critical structural elements are applied. Non-structural elements that are important for operations, such as racking, tanks or building services, are additionally secured against tipping and sliding.

Insurance relevance

Because earthquakes carry high spatial accumulation potential, the availability of earthquake cover is closely tied to reinsurance capacity and robust risk modelling. Documented retrofitting measures can have a risk-reducing effect on premium, deductible and cover capacity for the affected location.