Assessing the interaction of seismically loaded adjacent valleys using time-domain approach
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Assessing the interaction of seismically loaded adjacent valleys using time‑domain approach Navid Soltani1 · Hamed Javdanian2 · Nemat Soltani3 Received: 13 June 2020 / Accepted: 26 October 2020 © Akadémiai Kiadó 2020
Abstract Amplification or attenuation of seismic waves while passing through the soil medium can be due to soil type and its stratification or local topographic effects. Such aspects have been theoretically explained in many researches by means of ground response analysis. The results of seismic ground response analysis provide the necessary and realistic information for seismic design of structures and soil-structure interaction problems. In present study, two-dimensional finite element method is applied to evaluate the ground response of valley environments and estimation their interaction effects using time-domain approach. In this regard different cases include free field condition, single valley and double valleys environments are considered. Numerical simulations of seismic wave propagation for these cases are carried out and compared with each other. The results show that irregular topography can greatly amplify the seismic waves. On the other hand, if there are adjacent topographies, due to interaction of them, the amplification effect can be substantially increased. This amplification can be attenuated by moving away from the valley center to free field conditions. Keywords Ground response analysis · Two-dimensional model · Interaction of irregularities
1 Introduction Assessment the effects of site conditions on its seismic response is important to perform precise and realistic analysis of structures that are built on or around the site. These effects are generally divided into two categories: effects of local deposits and those of topography. In this regard, the effect of topographic irregularities on ground motions is of great importance. Recent studies have indicated that topographic irregularities (e.g., mountain ridges or valley notches) have caused significant changes to strong ground motions during * Navid Soltani [email protected] 1
Department of Civil Engineering, Faculty of Engineering, Ardakan University, Ardakan, Iran
2
Department of Civil Engineering, Shahrekord University, Shahrekord, Iran
3
Barzin Eskan Paya (BEP) Consulting Engineering, Yazd, Iran
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Vol.:(0123456789)
Acta Geodaetica et Geophysica
earthquakes. Investigations on many earthquakes occurred in the past also indicated the effect of surface topographic changes on ground response. The September 19, 1985 Michoacan earthquake ( Ms = 8.1) only resulted in moderate damages around the epicenter (near the Pacific coast of Mexico). However, it caused extensive damages to a site located as far as 350 km away from Mexico City (Kramer 1996). Another example of the effects of topography was seen in records taken by a seismograph installed on the piers of the Pacoima dam in southern California. The seismograph recorded horizontal peak accelerations as high as 1.25 g in both directions during the 1971 Sa
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