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https://www.ukessays.com/essays/engineering/three-pinned-portal-frame-...
https://www.slideshare.net/E185/portal-frame-1
https://www.scribd.com/doc/295935836/3-Pinned-Portal-Frames
http://srt251dgra.blogspot.com/2007/03/portal-frames-portal-frames-def...
https://www.youtube.com/watch%3Fv%3DJgldIARURp8
https://en.wikipedia.org/wiki/Portal_frame
https://www.ungersteel.com/unger/insider_wissen/S04_Design_portal_fram...
http://www.engr.mun.ca/~swamidas/ENGI6705-ClassNotesHandout41.doc
https://www.sciencedirect.com/topics/engineering/portal-frame
https://www.theseus.fi/bitstream/handle/10024/126499/body.pdf%3Fsequen...
https://pdfs.semanticscholar.org/8fd9/383cd137e01a59b366b160960dbb7091...