The plurality effect of topographical irregularities on site seismic response

Jahromi, Saeed Ghaffarpour; Karkhaneh, Sama

doi:10.1007/s11803-019-0519-4

Cited by 16 publications

(2 citation statements)

References 33 publications

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“…Some of the best-known numerical approaches to assess the seismic response of topographic features can be categorized as follows: i) Finite difference method (FDM), which is a method with computational efficiency and simple code structure, however, could present difficulties with the modeling of irregular geometry, (Oprsal 2002;Republic 2007;Blanch 2012). ii) Finite element method (FEM), which can accurately capture the effect of complex topographies, such as mountainous areas, without refining the grid resolution, but has several disadvantages such as the need for huge power of calculation and the need to apply numerical damping (Amorosi et al 2010;Jahromi and Karkhaneh 2019). iii) Boundary element method (BEM), direct (DBEM) (Chaillat et al 2012;Kamalian et al 2003a, b;Mogi and Kawakami 2007;Sohrabibidar et al 2010), and indirect (IBEM) (Griffiths and Bollinger 1979;Sánchez-Sesma et al 1993;Gil-Zepeda et al 2003;Lee 2013): the reduction of problem dimensionality is the most important advantage of BEM, it means that only boundary line and surface domain are discretized for twodimensional plane and 3D program, respectively.…”

Section: Numerical Modelingmentioning

confidence: 99%

The evaluation of the adjacency effect on the seismic response of homogenous hills

et al. 2023

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A brief review of previous studies shows that topographic features play an important role in the amplification (de-amplification) of seismic waves. Most researchers who have focused on topographic effects have paid attention to the distribution of amplification on isolated features, whereas what is seen in nature is often more complicated. It is known that 2D or 3D geological structures further contribute to the amplification of seismic ground motion. The main objective of this study is an investigation of the influence of adjacent hills on seismic responses. First, a parametric study has been performed, considering five models (consisting of one to five 2D symmetric homogeneous semi-sinusoidal hills), which are subjected to vertical incident waves. The 2D numerical results show that the largest values of spectral amplification for a series of 2D semi-sinusoidal hills are observed at the crest stations of the central hill, and it increases when the number of hills increases symmetrically on both sides of the central hill. This means that the spectral amplification increases from 3.3 for single-hill model to 4.37 for five-hill model. In the following, to validate the parametric results, three adjacent hills located in the city of Arak are studied using the horizontal-to-vertical spectral ratio analysis of microtremor recordings. The comparison with the amplification results obtained from the distinct element (UDEC) and boundary element (HYBRID) numerical approaches indicates that the central hill is more affected by adjacency, rather than the side hills. The spectral amplification for the crest station on the central hill is higher than the two other stations.

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Section: Numerical Modelingmentioning

confidence: 99%

The evaluation of the adjacency effect on the seismic response of homogenous hills

et al. 2023

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“…Several studies demonstrated that local seismic effects, due to soil properties and topography configuration, can significantly affect the response of structures (Jahromi and Karkhaneh 2019;Panzera et al 2018). Thus, to understand if the different response of the buildings in the historic centre of Norcia and Campi Alto were affected by different amplification factors, the results of a seismic microzonation study, carried out after the 2016 earthquake by SGA (Studio Geologi Associati -Perugia-Italy), is depicted in Fig.…”

Section: Historical Sequence Of Earthquakes In Norcia and Campi Altomentioning

confidence: 99%

Seismic performance of strengthened masonry structures: actual behaviour of buildings in Norcia and Campi Alto during the 2016 Central Italy seismic sequence

Sisti

Ludovico

Borri

et al. 2021

Bull Earthquake Eng

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The structural response of unreinforced masonry buildings designed for gravity load only or with reference to obsolete seismic provisions is widely studied in the literature in order to define proper strengthening strategies and solution to mitigate the seismic risk. However, the critical analysis of the effectiveness of past used strengthening solution is still lacking. To fill such gap, the present study deals with the evaluation of the seismic performances of buildings in Campi Alto struck by the 2016 central Italy seismic sequence. The behaviour of buildings in Campi Alto is compared with that of buildings in Norcia. A large part of the buildings in these two towns was strengthened between 1980 and 2000 during the reconstruction processes following previous earthquakes which occurred in 1979 and 1997. However, the strengthened buildings in Norcia reported limited damage while a significant and widespread level of damage was detected on several strengthened buildings in the hamlet of Campi Alto. This study focuses on the buildings in Campi Alto with the aim of investigating on the reasons of their unsatisfactory behaviour. Thus, the seismic action experienced by buildings in Norcia and Campi Alto is initially compared and the main vulnerabilities of these buildings are also evaluated. Then, 20 projects of strengthening interventions submitted to the Civil Engineering Department of the Umbria Region between 1984 and 2012 have been herein analysed and discussed in order to focus on the effectiveness of the strengthening solution adopted in the past. The analyses of such projects and of the empirical damage detected after the 2016 seismic sequence is a unique opportunity to derive useful information for future applications.

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Spatial seismic response of non-uniform wide river valley with multistage slopes in lower reaches of Yangtze River

Xiaoxiong,

Haiyang,

Zhaoyan

et al. 2023

Bull Eng Geol Environ

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The plurality effect of topographical irregularities on site seismic response

Cited by 16 publications

References 33 publications

The evaluation of the adjacency effect on the seismic response of homogenous hills

The evaluation of the adjacency effect on the seismic response of homogenous hills

Seismic performance of strengthened masonry structures: actual behaviour of buildings in Norcia and Campi Alto during the 2016 Central Italy seismic sequence

Spatial seismic response of non-uniform wide river valley with multistage slopes in lower reaches of Yangtze River

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