ABSTRACT
Radical Concrete Technology. Edited by R K Dhir and P C Hewlett. Published in 1996 by E & FN Spon, 2-6 Boundary Row, London SE1 8HN, UK. ISBN 0 419 21480 1. ABSTRACT. The paper considers one of the approaches to the evaluation of seismic resistance of spatial shell structures for seismic areas. Evaluation of seismic resistance of some types of spatial shell structures has been done experimentally to define by spectral analysis the amount of energy being transmitted to structures under the action of dynamic motion. Up-to-date physical procedures and proper handling of oscillograms have been used when evaluating the dynamic forces acting on thin shell structures during occuring earthquakes. The approach allowed to explain the “phenomenon of selectivity” when such systems as shells are more responsive to such constituents of vibrations the frequency of which is closer to their own frequency. Keywords: Shells, Spatial structure, Frequences of natural oscillations of structures, Frequences of soil vibrations, Convolution of spectra, Pseudovelocity. A.S.Zhiv is a Doctor of Technical Sciences, Professor at Vladimir State Technical University, Russia. He specialises in the field of experimental investigation and application of spatial structures under static and dynamic load. E.V.Kosygin is Candidate of Technical Sciences, Associate Professor at Vladimir State Technical University. He specialises in the field of optimization of construction on compressible soils. The paper presents the authors’ observations of the behaviour of reinforced concrete spatial structures erected in seismic zones of Kazakhstan. Prismatic, thin-slab shell structures, cylindrical, spherical and hyperbolic shells of heavy and lightweight concrete have been calculated for seismic resistance and the calculations have been supported by experimental results. Some spatial structures were designed of reinforced and cast-inplace concrete.
