I have a problem that i don't know how to explain
I modelised a structure like in the picture attached and i defined different cases of loadings.
loads from wind, seismic loads and permanent loads.
in 2 similar combination of loads i changed the sign for the horizontal loads
E.g.: 1) 1x[horizontal loads]+1x[vertical loads]+1x[wind loads]
2) 1x[horizontal loads]-1x[vertical loads]+1x[wind loads]
when i run the analysis in the case no. 2) i obtained at the bottom of the pole in the rigid fixing point a positive vertical effort.
After that, i changed and i replaced the weight of the element by vertical efforts bottom oriented. When i run the analysis i obtain the same value for the vertical effort at the bottom of the pole, which i consider normal.
can anyone explain to me what is happening actually