Experimental Study on the Natural Dynamic Characteristics of Steel-Framed Modular Structures

Corner-supported modular structures are made of repetitive prefurnished, prefinished units, which fabricated in a factory and transported to the site building form permanent block. The units then tied together through use so-called inter-modular connections, or inter-connections, different configuration at joints compared conventional steel structures. presence inter-connections these structures, addition beam-to-column connections intra-connections, may change their dynamic characteristics, including natural frequencies, mode shapes, damping ratios. This paper aims investigate characteristics operational modal analysis (OMA). A half-scaled three-storey structure, designed instrumented with highly sensitive accelerometers, was experimentally tested under pure randomly generated vibrations. time history response acceleration structure recorded using data acquisition system. Different output-only techniques OMA, based on both frequency domains, were employed analyse extract These peak picking (PP), enhanced frequency-domain decomposition (EFDD), stochastic subspace identification (SSI). outcomes this can be used for further research development an experimental formula design multistorey buildings against lateral loads.