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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 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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