8.Retaining

# 8.Retaining - Retaining Structures Theory and Design of...

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Theory and Design of Structures 1 Retaining Structures Retaining wall Sea Wall Retaining Structures Comparatively rigid block work structures Internal stresses are often not critical Thus, major design criterion of a retaining structure is not strength, but rather stability against sliding and overturning Retaining Structures e b a O x b x a Elevation F F Stresses caused by eccentric load M = Fe F + Effect of axial load Effect of eccentricity Retaining Structures Resultant Consider a prismatic block on the right The force F acting at an eccentricity of e from O is equivalent to an equal force F at O and a couple F·e. The stress at any point of the section at a distance x from O is composed of A uniform normal stress A varying stress due to the couple A F f = 0 I x e F f x = Retaining Structures e b a O x b x a Elevation F Superimposing the two effects, the stresses at the extreme edges a and b are: I x e F A F f f f a a + = + = 1 0 (1) I x e F A F f f f b b = = 2 0 (2) Retaining Structures 2 0 b f f f = 1 0 a f f f + = F Stresses caused by eccentric load M = Fe I x e F f b 2 = I x e F f a 1 = F A F f o = +

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Limiting Value of e Limiting value of e As the eccentricity e increases, the minimum stress drops and may become tensile which is undesirable in masonry structures In the limiting case, the smaller stress f b = 0,
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