Do beams need mezuzahs

Question:
Does the right beams in these pictures require a mezuza scroll to be mounted on them, since they resemble an entrance?
Answer:
These beams do not constitute a door post entrance, rather, they are intended to either support the roof or are for decoration purposes. In halacha this is called an "Achsadra,"as explained in Yoreh Deah 286:6, which is exempt from a Mezuza scroll. In general beams, pillars etc... are not regarded as door posts, however very easily the scenario can change the outcome of the halacha so it is always safer to ask when in doubt.