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Ground Loss 

GEO5

Geotechnical software

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Relative deflection

Definition of the term relative deflection is evident from the figure. The program searches regions on buildings with the maximum relative deflection both upwards and downwards. Clearly, from the damage of building point of view the most critical is the relative deflection upwards leading to "tensile opening" of building.

Relative deflectionRelative deflection

Verification of the maximum relative deflection is left to the user – the following tables list the ultimate values recommended by literature.

Type of structure Type of damage Ultimate relative deflection Δ/l
Burland and Wroth Meyerhof Polshin a Tokar ÈSN          73 1001
Unreinforced bearing walls Cracks in walls For  L/H = 1    -  0.0004
For  L/H = 5    -  0.0008 		0,0004 0,0004 0,0015
Cracks in bearing structures For  L/H = 1    -  0.0002
For  L/H = 5    -  0.0004 		- - -

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