Most recent issue published online in the International Journal of Earthquake and Impact Engineering.
International Journal of Earthquake and Impact Engineering
http://www.inderscience.com/browse/index.php?journalID=455&year=2022&vol=4&issue=1
Inderscience Publishers Ltd
en-uk
support@inderscience.com
International Journal of Earthquake and Impact Engineering
2397-9372
2397-9380
© 2022 Inderscience Enterprises Ltd.
© 2022 Inderscience Publishers Ltd
editor@inderscience.com
International Journal of Earthquake and Impact Engineering
https://www.inderscience.com/
http://www.inderscience.com/browse/index.php?journalID=455&year=2022&vol=4&issue=1
-
Characterisation of design spectra for vertical ground motion
http://www.inderscience.com/link.php?id=122818
Design recommendation on vertical ground motion offers dual challenges, namely the spectral shape and conditional peak-ground-acceleration. One way of recommending the vertical spectra is through V/H spectrum that can be multiplied with design horizontal spectrum. Seismic code recommendations do not explicitly account for the possible effects of magnitude (except EC8 Part-1) and epicentral distance. This paper is aimed to assess the possible effects of magnitude, epicentral distance and average shear wave velocity (representing the soil sites) on resulting V/H spectra. About 6,000 strong motion events are considered for this purpose. Resulting V/H and vertical spectra conditioned to the horizontal spectra are compared with the seismic code recommendations and prior-art. Also explored is the feasibility of possible recommendations on V/H spectra contingent on magnitude, epicentral distance and average shear wave velocity. Finally, the framework is assessed with respect to a strong motion event which was not included in the developmental database.
Characterisation of design spectra for vertical ground motion
Ravi Kanth Sriwastav; Dhiman Basu
International Journal of Earthquake and Impact Engineering, Vol. 4, No. 1 (2022) pp. 1 - 29
Design recommendation on vertical ground motion offers dual challenges, namely the spectral shape and conditional peak-ground-acceleration. One way of recommending the vertical spectra is through V/H spectrum that can be multiplied with design horizontal spectrum. Seismic code recommendations do not explicitly account for the possible effects of magnitude (except EC8 Part-1) and epicentral distance. This paper is aimed to assess the possible effects of magnitude, epicentral distance and average shear wave velocity (representing the soil sites) on resulting V/H spectra. About 6,000 strong motion events are considered for this purpose. Resulting V/H and vertical spectra conditioned to the horizontal spectra are compared with the seismic code recommendations and prior-art. Also explored is the feasibility of possible recommendations on V/H spectra contingent on magnitude, epicentral distance and average shear wave velocity. Finally, the framework is assessed with respect to a strong motion event which was not included in the developmental database.]]>
10.1504/IJEIE.2022.122818
International Journal of Earthquake and Impact Engineering, Vol. 4, No. 1 (2022) pp. 1 - 29
Ravi Kanth Sriwastav
Dhiman Basu
Department of Civil Engineering, Indian Institute of Technology Gandhinagar, India ' Department of Civil Engineering, Indian Institute of Technology Gandhinagar, India
ground motion characterisation
vertical design spectra
V/H spectra
2022-05-13T23:20:50-05:00
Copyright © 2022 Inderscience Enterprises Ltd.
4
1
1
29
2022-05-13T23:20:50-05:00
-
Analysis of the collapsed and replaced Tex-Wash bridges exposed to severe floods
http://www.inderscience.com/link.php?id=122821
The eastbound span of Tex-Wash Bridge collapsed due to severe flooding in 2015. The behaviour of the bridge under the flood is simulated using ANSYS. Next, a parametric study is performed to study the influence of velocity and depth of floodwaters on the performance of the bridge. Finally, the performance of the replaced bridge under the same flood event is evaluated. Results indicate only a slight increase in the velocity of water raises the pressure that is applied to the structure considerably. Also, the depth of water has a considerable effect on the response of the bridge. The study shows new replacement bridge is capable of resisting the same flood scenario. However, if floodwaters overflow the bridge deck, the buoyancy forces will uplift the hollow concrete deck girders. The uplift can be prevented by having holes in the hollow box girders, and having shear keys and uplift anchors at the girder supports.
Analysis of the collapsed and replaced Tex-Wash bridges exposed to severe floods
Maryam Tabbakhha; Abolhassan Astaneh-Asl
International Journal of Earthquake and Impact Engineering, Vol. 4, No. 1 (2022) pp. 30 - 47
The eastbound span of Tex-Wash Bridge collapsed due to severe flooding in 2015. The behaviour of the bridge under the flood is simulated using ANSYS. Next, a parametric study is performed to study the influence of velocity and depth of floodwaters on the performance of the bridge. Finally, the performance of the replaced bridge under the same flood event is evaluated. Results indicate only a slight increase in the velocity of water raises the pressure that is applied to the structure considerably. Also, the depth of water has a considerable effect on the response of the bridge. The study shows new replacement bridge is capable of resisting the same flood scenario. However, if floodwaters overflow the bridge deck, the buoyancy forces will uplift the hollow concrete deck girders. The uplift can be prevented by having holes in the hollow box girders, and having shear keys and uplift anchors at the girder supports.]]>
10.1504/IJEIE.2022.122821
International Journal of Earthquake and Impact Engineering, Vol. 4, No. 1 (2022) pp. 30 - 47
Maryam Tabbakhha
Abolhassan Astaneh-Asl
Department of Civil and Environmental Engineering, University of California, Berkeley, CA, 94720, USA ' Department of Civil and Environmental Engineering, University of California, Berkeley, CA, 94720, USA
flood protection
soil erosion
bridge collapse
structural engineering
fluid modelling
retaining walls
soil-structure interaction
scouring
concrete bridge
2022-05-13T23:20:50-05:00
Copyright © 2022 Inderscience Enterprises Ltd.
4
1
30
47
2022-05-13T23:20:50-05:00
-
Displacement response spectra for active seismic regions in India
http://www.inderscience.com/link.php?id=122834
As damage is better correlated to displacements than forces during an earthquake, displacement response spectrum (DRS) is critical for important structures. However, there are no past attempts to develop attenuation relations or response spectra for displacement spectral ordinates. Hence, in this study, probabilistic seismic hazard analysis (PSHA) has been carried out based on gridded seismicity approach to arrive at 5%-damped uniform hazard DRS (0.01 s-10 s) for the region (24°N-40°N, 65°E-100°E) for both rock and soil site conditions. The spectral displacement obtained at 10 s natural period is as high as 140 cm-145 cm for rock and 200 cm-210 cm for soil sites in the region. Moreover, a simplified bilinear approximation of the displacement spectra is presented along with the map of corner periods. These results can be used by engineers for displacement-based seismic design in the region, especially of critical and lifeline structures.
Displacement response spectra for active seismic regions in India
K.P. Sreejaya; S.T.G. Raghukanth; D. Srinagesh; C.V.R. Murty
International Journal of Earthquake and Impact Engineering, Vol. 4, No. 1 (2022) pp. 48 - 82
As damage is better correlated to displacements than forces during an earthquake, displacement response spectrum (DRS) is critical for important structures. However, there are no past attempts to develop attenuation relations or response spectra for displacement spectral ordinates. Hence, in this study, probabilistic seismic hazard analysis (PSHA) has been carried out based on gridded seismicity approach to arrive at 5%-damped uniform hazard DRS (0.01 s-10 s) for the region (24°N-40°N, 65°E-100°E) for both rock and soil site conditions. The spectral displacement obtained at 10 s natural period is as high as 140 cm-145 cm for rock and 200 cm-210 cm for soil sites in the region. Moreover, a simplified bilinear approximation of the displacement spectra is presented along with the map of corner periods. These results can be used by engineers for displacement-based seismic design in the region, especially of critical and lifeline structures.]]>
10.1504/IJEIE.2022.122834
International Journal of Earthquake and Impact Engineering, Vol. 4, No. 1 (2022) pp. 48 - 82
K.P. Sreejaya
S.T.G. Raghukanth
D. Srinagesh
C.V.R. Murty
Indian Institute of Technology, Madras, India ' Indian Institute of Technology, Madras, India ' CSIR National Geophysical Research Institute (NGRI), Hyderabad, India; Indian Institute of Technology, Madras, India ' Indian Institute of Technology, Madras, India
probabilistic seismic hazard
displacement response spectra
long-period structures
bilinear approximation
corner period
2022-05-13T23:20:50-05:00
Copyright © 2022 Inderscience Enterprises Ltd.
4
1
48
82
2022-05-13T23:20:50-05:00
-
Sudden soil subsidence due to large magnitude earthquakes: the case of Mexico City
http://www.inderscience.com/link.php?id=122852
The field observations in Mexico City during three large-magnitude earthquakes that occurred on 28 July 1957 (<i>M<SUB align="right">w</i> = 7.6), 19 September 1985 (<i>M<SUB align="right">w</i> = 8.0) and 19 September 2017 (<i>M<SUB align="right">w</i> = 7.1), offered several opportunities for observing a singular phenomenon: the sudden subsidence of ground and settlement of buildings. Sudden subsidence is a phenomenon that is far from being understood, and its transcendence is not fully appreciated. This paper aims to provide an insight into the cyclic compression of clayey soils. To understand the sudden subsidence phenomenon, a series of cyclic simple shear tests were performed on subsoil of Mexico City. These test results show that cyclic simple shear tests at constant vertical stresses agree reasonably well with field observations. Cyclic shear stresses deform the soil sample allowing soil particles to move back and forth. During each shear stress cycle, compression follows expansion, producing changes in the clay structure due to the physical sliding and reorientation of particles. These mechanisms are essential factors in the strength development and the compressibility of clayey soils, resulting in a progressive volume change of the soil, and consequently, the subsidence during large-magnitude earthquakes.
Sudden soil subsidence due to large magnitude earthquakes: the case of Mexico City
Jorge Abraham DÃaz-RodrÃguez
International Journal of Earthquake and Impact Engineering, Vol. 4, No. 1 (2022) pp. 83 - 98
The field observations in Mexico City during three large-magnitude earthquakes that occurred on 28 July 1957 (<i>M<SUB align="right">w</i> = 7.6), 19 September 1985 (<i>M<SUB align="right">w</i> = 8.0) and 19 September 2017 (<i>M<SUB align="right">w</i> = 7.1), offered several opportunities for observing a singular phenomenon: the sudden subsidence of ground and settlement of buildings. Sudden subsidence is a phenomenon that is far from being understood, and its transcendence is not fully appreciated. This paper aims to provide an insight into the cyclic compression of clayey soils. To understand the sudden subsidence phenomenon, a series of cyclic simple shear tests were performed on subsoil of Mexico City. These test results show that cyclic simple shear tests at constant vertical stresses agree reasonably well with field observations. Cyclic shear stresses deform the soil sample allowing soil particles to move back and forth. During each shear stress cycle, compression follows expansion, producing changes in the clay structure due to the physical sliding and reorientation of particles. These mechanisms are essential factors in the strength development and the compressibility of clayey soils, resulting in a progressive volume change of the soil, and consequently, the subsidence during large-magnitude earthquakes.]]>
10.1504/IJEIE.2022.122852
International Journal of Earthquake and Impact Engineering, Vol. 4, No. 1 (2022) pp. 83 - 98
K.P. Sreejaya
S.T.G. Raghukanth
D. Srinagesh
C.V.R. Murty
Facultad de IngenierÃa, Universidad Nacional Autónoma de México (UNAM), Av. Universidad 3000, Coyoacán, 04510, Mexico
Mexico City
large-magnitude earthquakes
sudden subsidence
laboratory results
2022-05-13T23:20:50-05:00
Copyright © 2022 Inderscience Enterprises Ltd.
4
1
83
98
2022-05-13T23:20:50-05:00