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The value of the load required to displace a Corrugated metal culvert or other elastic element in units of displacement is referred to as the stiffness of the element，Generally expressed as "K". If the elastic properties of the element are non-linear, the stiffness is no longer a constant, but changes as the load increases. Culvert metal pipe-type elastic elements used in general engineering, stiffness tolerance can be limited to within +/- 50%.
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