№2 2019
№2 2019

№2 2019

№2 2019

Content

The Method of Calculation of Religious Buildings, Taking into Account their Occupancy in Relation to the Mosques at the Middle East

Authors:    Aldrebi Ziad Ahmad   
Rubric:     Theoretical and experimental studies   

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This article discusses the method of calculating mosques, taking into account the possible accumulation of a large number of people during religious events. The distribution of the number of people during the operation of the mosque is obtained and the coefficients of the combination of seismic load and the number of people present in the mosque are established. Combination coefficients were calculated for a seismically dangerous region of territory of the Syrian Arab Republic. The calculation of economic and social risks was also performed. An example of the calculation of the Great Mosque in the city of Aleppo is given.


Evaluation of the Accuracy of Determining the Coordinates of Deformation Marks and the Distances Between Them

Authors:    Tsareva O.S.   
Rubric:     Theoretical and experimental studies   

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The article is presented an estimate of the accuracy of determining the coordinates using the polar spatial intersection. When implementing such resection using electronic tachometers, the coordinates of the deformation marks are interdependent. The most complete form that characterizes the accuracy and interdependence of random variables is the correlation (covariance) matrix. The coefficients of the matrix , included in the formula for calculating the covariance matrix were calculated. Since the evaluation of deformations is assumed using invariant parameters - the distances between the deformation marks, the accuracy of determining the distance between the deformation marks was evaluated.


Suggestions for Use the Period of Oscillation of Frame Buildings in Low-intensity Effects

Authors:    Tonkikh G.P.   
Rubric:     Theoretical and experimental studies   

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This article presents data on the impact of non-loadbearing structures on the amplitude-frequency characteristics of frame buildings during dynamic tests using low-intensity loads. On the basis of experimental studies, it is proposed to introduce a correction factor to the experimentally determined period of the building’s natural oscillations. In addition, proposals are made in which cases it is advisable to conduct dynamic tests using lowintensity loads.


Dynamics of the Object of Polygon of Seismic Isolation: Building at Kinematic Foundations

Authors:    Vladimir A. Lapin    Yerzhanov S.Е.   
Rubric:     Theoretical and experimental studies   

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To study the seismic insulating properties of buildings in Almaty there is a special polygon. It includes buildings with conventional strip foundations with a system of cross-belts, seismic kinematic and supports with PTFE gaskets. The buildings are equipped with stations of engineering and seismometric service. The results of experimental studies at home on KF, performed in the late 80-ies. The results are compared with the instrumental records of the earthquakes of May 31, 2012 and August 16, 2014. The period of maximum spectrum coincides with the resonance in the initial stages of vibration tests-0.45-0.51 seconds. It is established that floor distortions of floors of the building decrease with height. With the use of a one-mass calculation scheme, taking into account the nonlinear deformation diagram, the dynamic model of the building is calculated for the impact in the form of accelerograms of the specified earthquake at the Foundation level.


Operational Basis Earthquake and Design Basis Earthquake: Normal and Abnormal Relations

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

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The authors study the unexpected effect occurred in the practical design: the in-structure response spectrum for OBE proved to exceed the response spectrum for DBE at certain frequencies. It turns out that the reason is in the «abnormal» relation between Fourier spectra for the OBE and DBE time-histories. Such behavior was the result of the independent syntheses of the OBE and DBE time-histories matching target response spectra. «Normal» behavior of the response spectra does not guarantee «normal» behavior of the amplitude Fourier spectra throughout the whole frequency range, if phase Fourier spectra are independent. The «abnormal» effect under consideration is nonphysical. The authors give some recommendations to avoid it in the future analyses.