Site effects and associated structural damage analysis in Kathmandu Valley, Nepal

In order to explore the effective damage identification method for structure, the structural vibration signal is directly correlation dimension analyzed according to fractal theory, and structural damage is identified by measuring the singularity in system output, then the method for structural damage identification based on correlation dimension of vibration response is proposed. The damage analysis results of a simply supported beam demonstrate that, the proposed method can accurately detect single and multi different degree damage’s location of beam structure, and alteration of correlation dimension will increase along with the damage degree

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Structural Damage Analysis of a Frame Structure Models using Filtering Algorithms

Proceedings of the Seventh International Conference on Computational Structures Technology ◽

10.4203/ccp.79.241 ◽

2009 ◽

Author(s):

R. Endo ◽

N. Tosaka

Keyword(s):

Structural Damage ◽

Frame Structure ◽

Damage Analysis ◽

Filtering Algorithms

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The role of site effects on elevated seismic demands and corollary structural damage during the October 30, 2020, M7.0 Samos Island (Aegean Sea) Earthquake

Bulletin of Earthquake Engineering ◽

10.1007/s10518-021-01265-z ◽

2021 ◽

Author(s):

Kemal Onder Cetin ◽

Achilleas G. Papadimitriou ◽

Selim Altun ◽

Panagiotis Pelekis ◽

Berna Unutmaz ◽

...

Keyword(s):

Structural Damage ◽

Site Effects ◽

Aegean Sea ◽

Seismic Demands

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Structural damage analysis of a fast ship due to bow flare slamming

International Shipbuilding Progress ◽

10.3233/isp-1985-3236902 ◽

1985 ◽

Vol 32 (369) ◽

pp. 124-136 ◽

Cited By ~ 16

Author(s):

Y. Yamamoto ◽

K. Iida ◽

T. Fukasawa ◽

T. Murakami ◽

M. Arai ◽

...

Keyword(s):

Structural Damage ◽

Damage Analysis ◽

Bow Flare ◽

Flare Slamming

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Statistical analyses of damages to buildings in the 1988 Saguenay earthquake

Canadian Journal of Civil Engineering ◽

10.1139/l93-130 ◽

1993 ◽

Vol 20 (6) ◽

pp. 988-998 ◽

Cited By ~ 4

Author(s):

Patrick Paultre ◽

Guy Lefebvre ◽

Jean-Philippe Devic ◽

Gaétan Côté

Keyword(s):

Key Words ◽

Structural Damage ◽

Site Effects ◽

Soil Conditions ◽

Damage Site ◽

Earthquake Motion ◽

Earthquake Distribution ◽

Geotechnical Damage ◽

Motion Characteristics ◽

Compensation Program

The 1988 Saguenay earthquake caused a large variety of geotechnical and structural damage. A total of 1927 claim files, most of which were submitted under a compensation program sponsored by the ministère de la Sécurité publique du Québec, Direction générale de la sécurité civile, have been studied. The results of this study are presented in terms of correlations between damage and geographical distribution, earthquake motion characteristics, soil conditions, and type of structures. Site effects are pointed out as one of the main causes of damage to buildings even at large distances from the epicentre. Key words: Saguenay earthquake, distribution of damage, geotechnical damage, structural damage, site effects.

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Application of wavelet for seismic wave analysis in Kathmandu Valley after the 2015 Gorkha earthquake, Nepal

Geoenvironmental Disasters ◽

10.1186/s40677-019-0134-8 ◽

2020 ◽

Vol 7 (1) ◽

Author(s):

Binod Adhikari ◽

Subodh Dahal ◽

Monika Karki ◽

Roshan Kumar Mishra ◽

Ranjan Kumar Dahal ◽

...

Keyword(s):

Wavelet Transform ◽

Random Process ◽

Ground Motion ◽

Structural Damage ◽

Ground Motions ◽

Vertical Motion ◽

Earthquake Ground Motion ◽

Kathmandu Valley ◽

Time Frequency ◽

Long Period

AbstractIn this paper, we estimate the seismogenic energy during the Nepal Earthquake (25 April 2015) and studied the ground motion time-frequency characteristics in Kathmandu valley. The idea to analyze time-frequency characteristic of seismogenic energy signal is based on wavelet transform which we employed here. Wavelet transform has been used as a powerful signal analysis tools in various fields like compression, time-frequency analysis, earthquake parameter determination, climate studies, etc. This technique is particularly suitable for non-stationary signal. It is well recognized that the earthquake ground motion is a non-stationary random process. In order to characterize a non-stationary random process, it is required immeasurable samples in the mathematical sense. The wavelet transformation procedures that we follow here helps in random analyses of linear and non-linear structural systems, which are subjected to earthquake ground motion. The manners of seismic ground motion are characterized through wavelet coefficients associated to these signals. Both continuous wavelet transform (CWT) and discrete wavelet transform (DWT) techniques are applied to study ground motion in Kathmandu Valley in horizontal and vertical directions. These techniques help to point out the long-period ground motion with site response. We found that the long-period ground motions have enough power for structural damage. Comparing both the horizontal and the vertical motion, we observed that the most of the high amplitude signals are associated with the vertical motion: the high energy is released in that direction. It is found that the seismic energy is damped soon after the main event; however the period of damping is different. This can be seen on DWT curve where square wavelet coefficient is high at the time of aftershock and the value decrease with time. In other words, it is mostly associated with the arrival of Rayleigh waves. We concluded that long-period ground motions should be studied by earthquake engineers in order to avoid structural damage during the earthquake. Hence, by using wavelet technique we can specify the vulnerability of seismically active region and local topological features out there.

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