Experimental Study of Vibrations of Cross-Rod Spatial Structures

This article explores a technique for studying the dynamic characteristics of cross-rod spatial structures (CRSS) using small-scale models, including the developed nodal connection of spatial frame rods, protected by copyright. The use of a nodal connection makes it possible to regulate the construction lifting of large-span structures, increases their strength and reliability. The developed nodal connection of the structure can be used for any spatial frames of buildings and structures and is especially effective for the frames of buildings erected in areas of high seismicity.
The issue of choosing methods for excitation of free and forced vibrations is being investigated, equipment for recording and recording vibrations is selected, and a layout of vibration sensors and sources of excitation of free and forced vibrations is being developed. Natural vertical oscillations of the structure model were caused by removing it from the state of equilibrium by concentrated loads applied in the middle and in a quarter of the span with their subsequent removal.
The test results and their analysis are analyzed. The elements of experimental models at all stages of loading worked in the elastic stage. The tests carried out showed that the structure has sufficient strength, stability, rigidity and seismic resistance. On the basis of the results obtained, recommendations were made for their use in the calculation and design of CRSS for seismic regions.