Evaluation of RC Dome Dynamic Parameters Based on Full-Scale Testing By Vibration Machine

Abstract eng:
Analysis of natural vibration periods, modes and corresponding damping ratios of long-span spatial structures can provide fast and reliable indication about their real state. Experimental investigation of such structures under vibration loading can provide the required information about their current dynamic parameters that can be used to calibrate theoretical models, develop appropriate modelling techniques, etc. Sometimes the structural assessment can include non-destructive testing and additionally finite element modeling. Based on the obtained results, proper methods for retrofitting of existing long span spatial structures, damaged by earthquakes, impact and other dynamic excitations can be developed. In this study a spherical RC dome with a 30 m diameter has been investigated experimentally and theoretically. The study was aimed at developing and verifying an accurate theoretical model for assessing dynamic parameters of roofing RC domes. The investigated structure was subjected to dynamic loads, generated by a vibration machine. It allows testing structural dynamic response at various loading intensity levels up to plastic deformations or even local damages. The available experimental results are compared with analytical ones and with those of preliminary finite elements analysis. It is shown that the results, obtained by all methods (experimental, analytical and FE analysis), are very close. The theoretical model that was developed can be recommended for design of roofing RC domes.

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