This paper presents the results of about seventeen tests, collected from literature, conducted on axially and eccentrically loaded built-up hot-rolled steel section laced columns. Four axially loaded specimens were constructed using hot-rolled channels connected together with lacing plates. The built-up column samples had various lengths and various distances between the main chords. Each test specimen was tested for several times. In each times the specimen was considered to be a column with different initial imperfection. The eccentrically loaded columns were constructed using two hot-rolled channels connected together with Z-lacing. The Z-lacing bars had an angle cross-section. For both axially and eccentrically loaded columns, the lacing bars were welded to the chords. A 3-D finite element model was created to simulate the behavior of these columns. The numerical modeling of the experiments is presented in detail by describing the numerical models, types of finite elements, end configurations and methods of analyses. The numerical analyses included the effects of initial geometric imperfections and used the material properties measured from test. The numerical results showed a very good agreement with the experimental ones. The effect of end concentrated moments reduced significantly the axial capacity of the specimens.