Archive

Сейсмостойкое строительство. Безопасность сооружений. 2017 - №6

Content

Earthquake engineering of the Russian Federation as a priority direction of activity of JSC Research Center of Constructions

Authors:    Zvezdov A.I.    Smirnova L.N.    Vedyakov Ivan I.    Bubis A.A.   
Rubric:     Theoretical and experimental studies   

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a:2:{s:4:"TYPE";s:4:"HTML";s:4:"TEXT";s:882:"The article provides a brief historical background on the leading schools of earthquake-resistant construction and seismic isolation, formed on the basis of TsNIISK named after V.A. Coucherenko, JSC Research Center of Construction. A brief review of research works, monitoring and development of scientific and technical and regulatory documentation in the field of earthquake-proof construction, carried out by the institutes of JSC Research Center of Construction  in recent years is given. The purpose of these works was to solve the tasks set by the President and the Government of the Russian Federation in terms of ensuring the integrated seismic safety of the territory of the Russian Federation. Prospects are out lined and proposals are given by JSC Research Center of Construction on the further development of earthquake-resistant construction  in the Russian Federation.";}


Сombined asymptotic method in calculation of the internal structural forces: frequency-domain analysis

Authors:    Tyapin A.G.   
Rubric:     Theoretical and experimental studies   

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The combination rule for the responses to 1D excitations along 6 DOFs applied to the rigid basement is discussed. This 6D excitation at the basement is calculated in SSI analysis by the combined asymptotic method. Rocking components are correlated with horizontal components of the rigid basement’s motion. As a result, conventional SRSS rule applicable for 3D excitation may sometimes lead to non-conservative results. The author suggested the alternative rule: direct sum of the responses to horizontal and rocking excitation components in the same vertical plane and after that SRSS for the four responses. Here the conservatism of different approaches is compared. All the responses (to 1D and 6D  excitations) are calculated in the frequency domain


Сombined asymptotic method in calculation of the internal structural forces: linear spectral analysis

Authors:    Tyapin A.G.    Toporkov A.S.   
Rubric:     Theoretical and experimental studies   

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The new options of SCAD soft enabling linear spectral analysis following the requirements of nuclear industry codes were tested against close form solutions, ABAQUS modal analysis and FFT analysis in the frequency domain. Single-mode responses to 1D excitation were checked including angular  excitations; then multi-mode responses to 1D excitation were compared including residual modes. Finally the responses to the six-component excitation set up at the rigid base mat were compared. This excitation was obtained using Combined Asymptotic Method to account for soil-structure interaction. The results demonstrate the unacceptable underestimation of vertical internal forces calculated using civil codes (unlike nuclear codes)


Some questions about own vibrations of structures in seismic insulation of constructions

Authors:    Apsemetov M.Ch.   
Rubric:     Theoretical and experimental studies   

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The paper deals with the determination of the natural frequencies of the span structures of bridges with seismic isolation. Formulas and graphs of the frequency equation of beams are proposed and compared by the results of other researchers for special cases


Problems of designing rope roads in seismic field districts of the Russian Federation

Authors:    Soloviev A.V.    Vasiukov I.A.   
Rubric:     Seismic safety and seismic isolation of buildings   

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The article observes questions of designing of ropeways, connected with estimating of seismic actions with a respect to codes of Russian Federation. Analysis of designing process of aerial people carrying ropeways in lack codes conditions