reliability convergence question

[karimtarbali]

Hi
i have a question in reliability analysis. i run my model but this statement appears on the screen :

in Opensees 2.2.2

FORM Analysis is running ...
Limit-state function number: 1
Limit-state function value at start point, g=0
STEP #0: --------------------------------------

in Opensees1.7.3

FORM Analysis is running ...
Limit-state function number: 1
Limit-state function value at start point, g=0
STEP #0: SearchWithStepSizeAndStepDirection::doTheActualSearch() -
all components of the gradient vector is zero.
FORMAnalysis::analyze() - failed while finding the
design point for limit-state function number 1.

could you please help me ?
thanks

[kmackie]

It is not running in either version of OpenSees, but you will need to provide more information. The gradient is usually zero if you are not using any random variables in your analysis, your limit state function does not contain any explicit or implicit quantities, your analysis is not returning the correct value to the limit state function evaluator, your analysis is not completing, etc.

[karimtarbali]

Dear Professor MacKie
it was an honour to recieve answer from you specially i did not have hope to get any respond.
thank you very much for your kind respond. i am not a beginner in Opensees but i am a starter in reliability.
i kown that you may be so busy but could it be possible for me to send my questions to your email ? i am in desperate need of someone that i can consult.

thank you