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CSI SAFE will bevery useful feature to find long term non linear deflection for slabs. The procedure is as follow:
Define Load Cases,
a.Immdeiate Non-Linear(D.L -1 and L.L-1)
b. Sustained Non-Linear(D.L -1 and L.L-0.25)
c. Sustained Non-Linear Long Term (D.L-1 and L.L -0.25)
Define Load Combination for long term deflection as
Immd. NL - Sus. NL + Sus. NL Long term
Then run the analysis and check deflection for the above defined load combination.