Four people were injured when 60ft (18.3m) hoardings surrounding Oxford University's new £20m animal research laboratory blew down in high winds.
Emergency services were called to the Biomedical Research Facility building site in South Parks Road.
A 28-year-old man sustained cuts and a minor head wound and a 28-year-old woman sustained a fractured cheekbone.
A 30-year-old university staff member fractured her cheekbone and another member of staff dislocated his hip.
The casualties were all taken to the John Radcliffe Hospital.
Parks Road was closed at the junction with St Cross Road and Holywell Street. Longwall Street was also shut and road closures were expected to last into the evening.
Power cuts have affected homes and businesses across Oxfordshire.
Areas of Wantage and Bicester have been without power in addition to an estimated 7,000 homes in south Oxfordshire, which lost electricity in the morning.
Southern Electric said they have brought in extra engineers to fix faults.
Storm damage has forced the closure of the swimming pool at the White Horse Leisure Centre in Abingdon.
Swimming sessions for Thursday and Friday morning have been cancelled but the rest of the centre is operating as normal.