The existence of the floor slab can provide a continuous lateral restraint to the top flange of the beam. However, the lateral bracing requirements in the current code were established based on the test results of the beam without considering the lateral restraint on the top flange. Therefore, the requirements for the lateral bracing of the beam with floor slab should be re-examined. This thesis presents the experimental and analytical study on LTB behavior and the lateral bracing requirements of H-shaped steel beam subjected to seismic loading. A total of two small-scale beam specimens were tested under cyclic loading. The experiment results showed that by adding lateral bracing near each beam end is sufficient for the beam to achieve at least 0.04 rad of the plastic rotation capacity. A finite-element model was established and validated using the experiment results. The established FE model performs well in simulation the cyclic behavior of the beam. A total of 999 models were successfully run. Base on the analysis results, a more economical design guideline for beams that consider the presence floor slab was proposed.

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