Load combinations in time

To generate the load combinations for cracked deformation in time:

• Click on . The following dialogue appears:

• Click to generate the combinations automatically.
  • Column “Name“
    In this column you’ll find the name of the combination.
    The deflection just before the application of a new load, is characterized by a minus-sign.
    The deflection just after the application of a new load, is characterized by a plus-sign.
  • The coefficients C_i and C_c(t)
    For each load group and for each combination, the coefficients C_i and C_c(t) are given.
    • C_i corresponds to “which share of the immediate cracked deformation has occured”.
      In case of a dead load, C_i will always equal 1.
      In case of a variable load, C_i will be equal to ψ₂ (the quasi-permanent share of the variable load) or to 1.
    • C_c(t) corresponds to “which share of the delayed deformation caused by creep has already occured”.
      In case of a dead load, C_c(t) will vary between 0 (load has just been applied, no creep yet) and 1 (load has been there for a long time, creep fully present).
      In case of a variable load, C_c(t) will vary between 0 (load has just been applied, no creep yet) and ψ₂ (only the quasi-permenent share of the variable load has been there for a long time and will cause creep).
  • To delete the selected combination, click .
  • To delete all combinations, click .
  • To determine the deformation difference between two moments in time:
    Let’s say you want to know the additional deformation due to the placement of the walls. The weight of the walls is assumed to be present at 90 days.
    • Click .
    • Select the first combination.
      Choose “t=inf. ZC”.
    • Select the second combination.
      Choose “t=-90days“. This is right before the partion walls are there.
    • Diamonds will immediately add a combination to the list corresponding to the difference between the two time stamps.