charlie87
Guest
Good morning.
I am carrying out an instability analysis of a simple portal framed at the base. I have already done a linear analysis to the autovalues and calculated the critical load in perfect structure condition.
I would now need to analyze the occurrence of instability phenomena in case of high horizontal forces (sisma-shaped as static action equivalent to the head of the chassis). I know how to carry out load cases and combine them in case of linear analysis (through various load steps), but I do not know in case of multiple loads applied at the same time as to make the program understand that a load step (that of vertical loads) is variable, while the other (system) is constant and therefore should not vary during the increase of the load that is carried out in the analysis n.linear.
to specify for which, I have two load cases: horizontal (constant) and vertical (which must vary), which are to be activated in parallel (and not in sequence) . on the "structural analysis guide" to pg.175 there is an example, but firstly it is carried out in linear analysis, and second is not clearly the way in which it solves the thing.
Thank you in advance for your attention
I am carrying out an instability analysis of a simple portal framed at the base. I have already done a linear analysis to the autovalues and calculated the critical load in perfect structure condition.
I would now need to analyze the occurrence of instability phenomena in case of high horizontal forces (sisma-shaped as static action equivalent to the head of the chassis). I know how to carry out load cases and combine them in case of linear analysis (through various load steps), but I do not know in case of multiple loads applied at the same time as to make the program understand that a load step (that of vertical loads) is variable, while the other (system) is constant and therefore should not vary during the increase of the load that is carried out in the analysis n.linear.
to specify for which, I have two load cases: horizontal (constant) and vertical (which must vary), which are to be activated in parallel (and not in sequence) . on the "structural analysis guide" to pg.175 there is an example, but firstly it is carried out in linear analysis, and second is not clearly the way in which it solves the thing.
Thank you in advance for your attention