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(2005) considered theĭynamic response and failure behavior of rocks subjected to dynamic loading with the frequency ranging fromĠ.5 to 5 Hz and found that the obtained strain rate Loading rate generally causes rock deformation mode toĬhange from brittle to ductile deformation mode (Sanoįrequency does not play an important role in assessing the shear strength of intact rocks, as shown byīurdine (1963), Haimson and Kim (1972) and Ray etĪl. Results have revealed that decreasing of the Numerous studies have been performed to investigate the effect of loading rate on the deformation mode of rock That normal displacement of joint with special asperityĭecreases with loading frequencies increasing. (2007) considered the closure of rock joint under dynamic loading with different frequencies and indicated (2004) studied the mechanical behavior of rock joints under cyclic loadingĪnd showed that continuous reduction of shear strength Only in relation to the period time of structure (Kappos,Įffect of dynamic loading frequency on the response of geotechnical materials has been considered in There is not a certain loading rate orįrequency as a threshold to distinguish the static andĭynamic loading, because a load varies slowly or is fast Magnitude occurs in a slow rate and it can be supposedĪs a static load. In many cases, however, the variation of load Based on the mentioned definition, almostĪll loads in nature are dynamic, because those are timeĭependent. e-mail: Seismological Society of China, Institute of Geophysics,Ĭhina Earthquake Administration, and Springer-Verlag Berlinįreedom makes this type of analysis be a part of designīy definition, dynamic load is a type of load thatĬhanges in the direction or quantity of force during operation time. Received 26 January 2012 accepted in revised formĬorresponding author.
#Seismosignal v4.3.0 software#
Software being able to deal explicitly with dynamicĪnalysis of realistic structures with many degrees of It is obvious that this method involves an insufficient accuracy because of different characteristic This was based on magnification of vertical applied load or specifying of equivalent horizontal Dynamic response of geotechnical structures has traditionally beenĪtt ended, for design purposes, in an ‘equivalent static’Īpproach. Slopes, tunnels, caverns and foundations. Range of these structures has been more developed, including embankments, earth dams, retaining walls, Used to be 20 or 30 years ago, because the application Geotechnical structures exposed to dynamic loading is now more of a concern for the designer than it Key words: ground motion parameter load frequency PGA dynamic analysis wave attenuation Furthermore, incident load frequency and naturalįrequency of a system have influence on the wave attenuation and dynamic damping of the system. With identical PGA is related to the seismic load frequency. Result of analyses show that specific energy of seismic loading Finally, effects of incident load frequency and frequency ratio on the dynamicĭamping of geotechnical materials are discussed. In the next, seismic response of underground structure is assessed numerically Then, concrete lining response of a circular tunnel under various seismicĬonditions is evaluated analytically.
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Variation of ground motion parameters with ratio of peak ground velocity (PGV) to PGA, as a parameter related Eight accelerograms regarding different occurred earthquakes that are scaled to an identical PGA and This study focuses on the seismic load frequency and its effect on the underground Peak ground acceleration (PGA), frequency content and time duration are three fundamental Mining Engineering Department, Isfahan University of Technology, Isfahan 84156-83111, Iran Rock Mechanics Department, School of Engineering, Tarbiat Modares University, Tehran 14117-13116, Iran