Model Analysis of Steel Frame Structures Considering Interactions between Racks and the Frame

The steel racks on the floor are seen as live loads in current design process, ignoring interaction with supporting frames. In this paper, multiple different masses and stiffnesses placed first of a two-story main structure to form real structures (RS). corresponding simplified (SS) frames mass concentrated structure. Modal analysis is performed analyze relationship between periods RS SS cross-aisle direction. Firstly, beams assumed be infinitely rigid. rack TRk, TSS, TRS under ratios α established, an accurate equation relating TRk TSS proposed. Moreover, by considering influence finite beam stiffness, studied constructing models. effect reflected combined system consisting racks. A modified model, distinguished from no-mass racks, constructed study strengthening first-floor beams. top connecting bars also analyzed.