Normally, When shia muslim finish to pray salat jumaa, each individual pray salat dhuhri following by salat Asri in jamaa? The question is why do we have to pray salat dhuhri on Friday after salat jumaa?

Friday prayer is only wajib during the presence of Imam Mahdi a.s
In the occultation of Imam Mahdi a.s, on the day of Friday. There is a option of either to read jummah prayer or zuhr prayer. Some marajia say if you read jummah prayer you don’t have to read zuhr prayer and some say as a precaution still read zuhr prayer due to non presence of imam.