Lateral bracing requirements of SM570 H-shaped steel beams are presented in this
thesis. Experiments were conducted to observe the behavior of the beam with various lateral bracing configurations. Three beam specimens were tested under cyclic loading. Several lateral bracings were installed on the top flange to represent the existence of a floor slab. The experiment results showed that a beam with reduced lateral bracing behaved satisfactorily. The strength of the beam achieve the actual plastic moment capacity, and the twist deformation did not increase significantly. The beams are modeled in the Abaqus program, and a material model of SM570 was required. In order to establish a material model of SM570, the Chaboche method was used. There are nine parameters that must be determined to establish a material model for cyclically loaded beam specimen. The parameters can be obtained from cyclic loaded beam test. Three beam specimens were loaded under 4-point loaded scheme and subjected to cyclic loading. The established material model was used in Finite Element Analysis. Three schemes were proposed for a beam with a floor slab. From the analysis results, a design methodology
was established.

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