Yes, Simpson anchors would be fine. I work for a large kitset building manufacturer and this is one of the fixing options we use for our carports.
Make sure that the bolts are at least 100mm away (4 inch) from the edge of the concrete. Also you will need some braces running from the post diagonally up to the rafters - two per post. 700mm (30 inch long braces). Otherwise the carport will sway.
However there is no doubt that concreting the posts directly into the ground is the strongest fixing method. A 12 in x 12 in hole 48 inch deep would be sufficient
Make sure that the bolts are at least 100mm away (4 inch) from the edge of the concrete. Also you will need some braces running from the post diagonally up to the rafters - two per post. 700mm (30 inch long braces). Otherwise the carport will sway.
However there is no doubt that concreting the posts directly into the ground is the strongest fixing method. A 12 in x 12 in hole 48 inch deep would be sufficient