Case Study 1999. Composite rooflight testing


Hambeside Danelaw


OFS measurement of dynamic loading and long-term residual strain build-up in GRP roof light to
heath and safety executive requirements


SmartPatch sensors were attached to the underside of the structure. Data were collected as 45kg sandbag drops were made from a height of 1.2m (the health and safety executive requirement). Dynamic data showed the maximum strain applied to the structure, and long term measurements showed that residual strain was built-up in the component as a result of successive bag drops.

Dynamic load measurements, single drop

Figure 1: Dynamic load measurements, single drop


Strain build-up from successive drops

Figure 2: Strain build-up from successive drops



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