Stresses in Concrete Around Spiral Case

by Prem S. Nigam, (M.ASCE), Superintending Engr.; Irrigation Dept., Lucknow, India,
Madhu B. Kanchi, (M.ASCE), Head; Struct. Engrg. Section, Civ. Engrg. Dept., Univ. of Roorkee, Roorkee, India,
Om P. Jain, Prof. and Head; Civ. Engrg. Dept., Univ. of Roorkee, Roorkee, India,

Serial Information: Journal of the Power Division, 1976, Vol. 102, Issue 1, Pg. 95-111

Document Type: Journal Paper


The concrete around the spiral case of a hydroelectric power station has such a complex shape that determination of actual stress distribution and explanation of its structural behavior is very difficult. This paper reports the results of original research work done on three-dimensional analysis of such a structure. Photoelastic technique has been employed to determine the six components of stress at 2,700 points due to the static generator load. The results are of far-reaching importance insofar as they reveal the structural behavior of spiral case concrete, which is entirely different from the prevalent design practices, based on elementary two-dimensional theories. The stress diagrams given and the structural behavior explained will help designers evolve safe and economical solutions to the problem.

Subject Headings: Structural behavior | Stress distribution | Concrete | Concrete structures | Structural safety | Hydro power | Power plants | Three-dimensional analysis

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