Civil engineers can now reliably assess the claim that increased
car and heavy truck traffic is shortening the life of roads and
bridges. This breakthrough is achieved by a new instrument that
measures and constantly analyses the fluctuating loads on critical
parts of structures over long periods. The instrument provides
information for predicting structural failure and therefore enables
measuring the life span of bridges.
Previously,
over-engineering allowed the life span of a bridge to be guessed
at, say, fifty years. However, planners demand more specific information.
While measuring distortion on structures is easy, the problem
for engineers has been measuring loads that actually contribute
to stress. The new instrument overcomes this.
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words)