查看文章

This paper presents the findings of an experimental and numerical study on the system identification of modular steel frames in a laboratory environment. The project is a part of a broad study about the structural response of modular steel buildings. For this purpose, an experimental program is conducted on a full-scale volumetric prefabricated steel module, which is designed based on Australian standards. The module is fixed on a strong floor, instrumented with sensitive accelerometers, and its ambient and free vibration responses are captured and recorded. The output-only algorithms of operational modal analysis procedure, that is, direct fast Fourier transform, enhanced frequency domain decomposition, and stochastic subspace identification, are employed for extracting the main dynamic properties of the module, including natural frequencies, mode shapes, and modal damping ratios. Then the numerical finite …