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Volume 10 (2010)
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Volume 10, Issue 5
Displaying 1-4 of 4 articles from this issue
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Technical Papers
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Yuki SAKAI, Takumi KUMAMOTO2010 Volume 10 Issue 5 Pages 5_1-5_20
Published: 2010
Released on J-STAGE: November 09, 2011
JOURNAL FREE ACCESSDirectional property of seismic ground motions was quantitatively investigated. We made elastic response spectra in all 36 directions from past strong ground motion records and calculated coefficient of variance for various seismic intensity and response acceleration spectra changing period range. The average and maximum coefficients of variance were about 20% and 40%, respectively. We proposed 'average direction' of seismic ground motions in which the 0-3 sec. average response acceleration is equal to the average of all directions. This concept is useful in the earthquake damage estimation because we could reproduce actual structural damage by earthquake response analyses using SDOF systems under the input of seismic ground motions in the 'average direction'.View full abstractDownload PDF (2201K) -
Santa Man SHRESTHA, Hideji KAWAKAMI, Hidenori MOGI2010 Volume 10 Issue 5 Pages 5_21-5_37
Published: 2010
Released on J-STAGE: November 09, 2011
JOURNAL FREE ACCESSNew method of wave propagation analysis is introduced and is used to analyze the time histories during and after the Hyogoken-nanbu earthquake at Port Island site in Kobe. The results show large reduction of the S-wave velocity at the surface layer (0-16m) and large reduction of peak amplitude of ground motion at ground surface during the main shock, indicating liquefaction of that layer. The reflected peaks from ground surface could not be seen during main shock but can clearly be seen in the aftershocks at depths. However, the reflected peaks from the boundary of the liquefied and non-liquefied layers can be seen during liquefaction.View full abstractDownload PDF (2410K) -
Kensuke ARAI, Yuki SAKAI2010 Volume 10 Issue 5 Pages 5_38-5_51
Published: 2010
Released on J-STAGE: November 09, 2011
JOURNAL FREE ACCESSWe developed population database classified according to story and building type from census population database in order to estimate earthquake damage more accurately assuming that there are correlation between numbers of non-wooden or high-rise buildings and the population. We constructed the method of estimating population of wooden houses, low-to-mid-rise(1-10 story) and high-rise(over 11 story) non-wooden buildings in the 1km and 500m mesh from The Grid-square Statistics based on the population data we investigated and collected in the selected 20 meshes in Kanto area. We could accurately estimate population of three classified buildings.View full abstractDownload PDF (831K) -
Yasuko KUWATA, Sakae SAITO2010 Volume 10 Issue 5 Pages 5_52-5_65
Published: 2010
Released on J-STAGE: November 09, 2011
JOURNAL FREE ACCESSThis paper attempts to measure the time available to escape during an earthquake. Because human behavior during a quake has been studied in terms of seismic intensity on the Japan Meteorological Agency (JMA) scale, we used instantaneous instrumental seismic intensity, which can evaluate a sequence of seismic ground motion by the seismic intensity. The available escape time was analyzed using records from different earthquake types and quantified by source distance, magnitude, and earthquake type.View full abstractDownload PDF (470K)
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