Response Spectrum

Dear Sir/Madam,

Fyi, below image is the assignation of response spectrum in Z direction

In my structure, I've purposely assigned one node (Node 9) between beam 5 & 9. (Refer to image below)

And I've modelled beam 8 without midpoint node assigned to it. (Refer to image below)

When I go to my beam result, noticed that there is Fz on beam 5 & 9 (Although beam 5 & 9 are actually one continuous beam)

and there is no Fz force on beam 8

Could anyone mind explaining it to me? Attached staad file for your reference. Thank you
7356.TEST.STD

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