As you may know, STRI3 is a triangular 3-node element for Kirchhoff thin plate bending. Abaqus has both finite- and small-strain shell elements:
finite-strain shell elements:
Element types S3/S3R, S4, S4R, SAX1, SAX2, SAX2T, SAXA1n, and SAXA2n account for finite membrane strains and arbitrarily large rotations; therefore, they are suitable for large-strain analysis.
small-strain shell elements:
Element types STRI3, S4R5, STRI65, S8R, S8RT, S8R5, and S9R5 are for arbitrarily large rotations but only small strains, and the change in thickness with deformation is ignored in them.
The linked video compares different shell elements (S3, STRI3, S4, S4R, S4R5 and S8R): https://www.youtube.com/watch?v=r07xbStPLcI