Deflections interpretation rules

EN, NEN-EN, NBN-EN 1990;

NEN-EN 1995

(Fig. 1)

ENV 1993-1-1 (old code)

(Fig. 2)

NEN6702:2001

(Fig. 3)

Description

w₁

(Pre-camber (w_c) isn't taken in to calculation of w₁)

δ₁ (including precamber - δ₀ if it persist)

U_on (including precamber - U_ze if it persist)

Initial part of the deflection under permanent loads of the relevant combination of actions immediately after loading. Pre-camber (w_c) isn't taken in to calculation of w₁

w₂

w_creep (NEN-EN 1995)

Not explicitly represented in the code

U_kr

Long-term part of the deflection under permanent load

w₃

Not explicitly represented in the code

Not explicitly represented in the code

Additional part of the deflection due to the variable actions of the relevant combination of actions

w_c

Positive value – opposite to regular deflections

δ₀

U_ze

Pre-camber in the unloaded structural member (not calculated, user defined value)

w_tot

(w₁+ w₂+ w₃)

Not explicitly represented in the code

U_tot

Total deflection pre-camber (w_c) isn't taken in to calculation

wmax

(w₁+ w₂+ w₃) - w_c

δ_max

U_eind

(U_eind = U_tot - U_ze)

Remaining total deflection, where with taking in to account pre-camber

(w₂+ w₃)

Not explicitly represented in the code

δ₂ or δ_z (as Delta_z)

U_bij

Variation of the deflections due to variable loading + time dependent deformations due to permanent load. Exploitation stage of the building

(w₁+ w₃)

Winst (NEN-EN 1995)

Not explicitly represented in the code

Not explicitly represented in the code

U_el

Initial part of the deflection under permanent loads and additional part of the deflection due to the variable actions of the relevant combination of actions immediately after loading