METHODOLOGY AND PRACTICAL APPROBATION OF IN-SITU VIBRODYNAMIC TESTING OF LARGE-SCALE METAL MODULAR SYSTEMS UNDER TRANSPORTATION LOADING
DOI:
https://doi.org/10.32782/2415-8151.2026.40.11Keywords:
large-scale modular systems, in-situ experiment, spatial metal framework, vibrodynamic testing, transportation, kinematic excitation, frequencies and mode shapesAbstract
Purpose of this study is the development, theoretical justification, and practical approbation of a comprehensive methodology for conducting in-situ vibrodynamic testing of large-scale spatial modular systems directly in field conditions at various stages of their logistic life cycle. Methodology. The object of the study is a large-scale fully prefabricated metal module (an autonomous boiler house). The mass of the system is 4500 kg, featuring a significant asymmetric concentrated load. Empirical measurements of vibration accelerations and natural frequencies of the spatial framework were implemented using a specialized hardware-software complex. Data registration was performed at three stages: initiation of free vibrations by the method of instantaneous load removal, kinematic excitation during the detachment of the system by a lifting crane, and transportation of the module on roads with different types of pavement. Fast Fourier transform algorithms were used to process the obtained data arrays. Results. The obtained array of verified empirical data proves the fact of intense destructive impact on the spatial framework long before it is put into operation. The processes of transportation and installation generate critical kinematic excitations that are not considered in standard static calculations. Spectral analysis recorded the actual natural frequencies of the framework: 12.25 Hz along the transverse axis and 16.0 Hz along the longitudinal axis. During loading and unloading operations, peak vertical vibration accelerations reached 1.4 m/s². Direct transportation of the module generated critical values of spatial vibration accelerations approaching the limit of 9.0 m/s², which is equivalent to the impact of a high-intensity earthquake. Scientific novelty. For the first time, reliable empirical data on the kinematic response of large-scale metal modular systems under real transport and installation loads were obtained. It has been proven that logistic dynamic impacts can significantly exceed operational static loads in intensity, forming a complex dynamic contour of the system. The identified basic natural frequencies are fixed as reference input parameters for further validation of finite element models. Practical relevance. The market for prefabricated buildings in Ukraine currently demonstrates the mass production of uncertified modular structures. A total absence of specialized state building codes regulating the resistance of such systems to logistic and operational dynamic loads is recorded. The obtained results confirm the urgent need for structural modernization of mobile buildings and the integration of special damping devices (rubber-metal seismic isolators) into the structural scheme, which will reduce deformative risks for bearing nodes.
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