The influences of brace and fire locations on deformations and internal forces of single-story RC frames with specially shaped columns at high temperature are investigated.Simulation results show that: In the case that braces are located at one side of a single-story multi-span frame

the lateral deformation of the opposite side column increases

this is disadvantageous for structural fire resistance;In the case that braces are located at both left and right end-spans of a single-story multi-span frame

the axial force ratios of beams in nonbracing spans subjected to fire are large

which may lead to collapse of these beams at the late heating time.At the end

an assessment method is proposed for fire behaviors of four kinds of single-story frames with braces and specially shaped columns.