Calculation of deflection

 

The following type of deflection is calculated in code dependent deflection:

• Linear (elastic) deflection δ_lin,y(z) - this deflection is calculated for total combination and for linear stiffness. Value of deflection is the same as values of deflection calculated in tree Results.
• Immediate deflection δ_imm,y(z) - deflection after applying permanent and long-term variable load calculated for short-term stiffness and immediate combination.
• Short term deflection δ_short,y(z) - deflection with taking into account cracking of cross-section/2D element calculated for short-term stiffness and total combination (combination defined directly in the Result case for deflection).
• Deflection caused by creep δ_creep,y(z) - deflection calculated as difference between deflection calculated for long-term and short-term stiffness for creep combination.

δ_creep,y(z) = δ_{creep,long,y(z)} - δ_{creep,short,y(z)}

• Additional (harmful) deflection δ_add,y(z) - deflection after applying variable load with taking into account deflection caused by creep calculated. The value is calculated as difference between total and immediate deflection.

δ_add,y(z) = δ_tot,y(z) - δ_imm,y(z)

• Total (long-term) deflection δ_tot,y(z) - deflection with taking into account creep and cracking calculated as sum of short-term deflection and deflection caused by creep.

δ_tot,y(z) = δ_short,y(z) + δ_creep,y(z)

 

Generally, the components calculated can be graphically presented on the following figure

Only deflection in y and z axes of LCS of member is calculated for 1D member. For 2D member only deflection in z axis of LCS of member (deflection perpendicular to plane of 2D member) is supported.

All types of deflection are calculated for each dangerous (linear combination) and maximal/minimal value from all combinations is presented in each section/elements.