Release Time:2022-07-27  Hits:

Date of Publication: 2014-01-01

Journal: 水利学报

Institution: 建设工程学部

Issue: 11

Page Number: 1381-1386

ISSN: 0559-9350

Abstract: A thin yielding layer, which is installed between steel liners and surrounding concrete of buried penstocks or spiral cases in hydropower stations, can regulate quantitatively the ratio of internal water pres?sure allocated between the components. At present, the material nonlinearity of the yielding layer has not been considered in deriving and determining analytically the internal water pressure transmission coefficientλ. In this paper, according to the theory of multilayer cylinder and actual loading features of the yielding layer, the analytical formula for calculating λ was derived, where the material compression nonlinearity of the yielding layer and existence of gaps between the components were first considered. The formula shows that λ is influenced by the gap, applied water pressure, and the thickness, residual strain and stress-strain data at the loading stage of the yielding layer. An example shows that λ varies dramatically with the thickness of the yielding layer. The thicker the yielding layer becomes, the bigger λ is. In addi?tion,λ becomes smaller with the cycle number of loading and unloading for the yielding layer. When the cycle number exceeds a certain value,λ remains unchanged.

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