How i can overcame Convergence failure occur in Nonlinear time history analysis ?

Hesham Tahon @Hesham-Tahon

03 June 2024 1 6K Report

Dears,

while running nonlinear analysis for 3story building

this message appear when analysis complete

CONVERGENCE FAILURE OCCURED IN CASE: K6 AT TIME STEP 422, RELATIVE ERROR = 353.925815?

how i can solve this issue

Aram Soroushian

Dear Hesham

Nice question, but maybe for nonlinear time (or response) history analysis you do not need to overcome the convergence failure, at all; in brief the reason is the fact that in these analyses the inaccuracy is under the influence of both time step size and the nonlinearity iterations, and these two sources are mostly independent. Have a look at "Soroushian, A. and Wriggers, P., 2023. Elimination of the stops because of failure of nonlinear solutions in nonlinear seismic time history analysis. Journal of Vibration Engineering & Technologies, 11(6), pp.2831-2849", and if needed be in contact. I need to leave now. Have a very nice day.

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