Abstract
Spiral case with cushion layer is commonly given a significant consideration on hydroelectric power station design for vital practical reasons. In this paper, combined with an engineering project, non-linear constitutive equation suited to concrete material was selected according to the finite element theory. On the condition of structure weight and pressure of internal water, the combinations composed of jointly loaded spiral case structure including steel lining, different thickness of cushion layer and reinforce concrete structure around spiral case are calculated and analyzed. The relation between stress (concrete stress & spiral case stress) and thickness of cushion layer is proposed, which in turn provides design basis for the project.
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