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- 저자 : Majid Koolivand (검색결과 2 건)
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Majid Koolivand,Reza Rasti Ardakani,Abbas Mahdaviana,Hamid Saffari 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.9
In this paper, the process of simulating the occurrence of an earthquake on the fault plane forthe 2016 Kumamoto, Japan earthquake is investigated dynamically using finite elementmethods. The two-dimensional finite element method is used by concentrating friction at thefinite points. The used element is the elastic element, whose properties are determined basedon the shear wave velocity and longitudinal wave. In order to verify the proposed method, theacceleration and velocity response spectra, Fourier spectrum, and other main parameters ofthe record obtained from the simulation were compared with the Kik-net data. From theobtained results, the role of displacement and velocity of its application to the fault plate inPGA can be pointed out, so that with a faster displacement of the fault plane, a larger PGA isexpected. Friction and shear stiffness between the two fault planes and the dependence offriction on velocity are the main and influential factors in the characteristics of the producedearthquake. In high-frequency earthquakes, friction is dependent on velocity, and whenfriction is not dependent on velocity, static plays a major role, and no drastic changes in theresponse spectrum are observed.
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Seismic Reliability of Concrete Buildings Considering Probabilistic Distribution of Crack
Mohammad Safi,Majid Koolivand,Hesamoddin Ketabdari,Mahsa Rasouli 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.1
One of the effective factors in the analysis of concrete structures is consideration of the effect of cracking on the structural elements, which directly affects the calculation of the natural periods, the story displacement and other response parameters. In different codes for design of concrete structures, cracking effect is considered as a mean and constant coefficient for each element, while clearly the condition of various components will be different based on loading situation and specifications. In this paper, reliability of stiffness reduction coefficients of the beams and columns due to cracking of concrete in the ACI code is investigated under random distribution of floor live loads using Monte Carlo simulation method, By considering 1,000 modelling loops, calculating accurate crack coefficients of beams and columns and applying them in each model, the reliability of cracking coefficients has been obtained. The results show that the reliability index of these coefficients is very low. Also, other results of this modeling and applying accurate cracking coefficients show that the story displacements and the time period of first and second modes decrease about 40 − 55% and 20 − 30%, respectively, and the reaction forces of the elements, especially the axial and torsional forces increase about 20 − 30%.
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