this is the modelling viewport everything is okay however when rendering only the columns disappear i have tried other parts of my project but everything works fine expect this part. i have searched on youtube and internet and found those In object mode press W --- clear all restricted render. That will make all objects visible in the render. ( when pressing w it switch to select circle from the select box button) Also, you can select an object and hit Ctrl+Alt+H to un-restrict render on the selected object. (nothing happened)
when i opened my laptop right now the file looked like this somehow dont know how they transformed like this. i dont know how to send the file here i cant see a attachment option 
