SEISMIC DAMAGE MECHANISM OF SEWER BURIED PIPES BY SURFACE RUPTURES IN THE 2016 KUMAMOTO EARTHQUAKE

2020 ◽  
Vol 76 (4) ◽  
pp. I_441-I_453
Author(s):  
Daichi HATAKEYAMA ◽  
Gaku SHOJI ◽  
Shigeru NAGATA ◽  
Masayuki YOSHIMI
Keyword(s):  
Damage Mechanism ◽  
Seismic Damage ◽  
2016 Kumamoto Earthquake ◽  
Buried Pipes ◽  
Kumamoto Earthquake ◽  
The 2016 Kumamoto Earthquake ◽  
Surface Ruptures

SEISMIC DAMAGE PREDICTION FOR JAPANESE-STYLE WOODEN HOUSE IN THE 2016 KUMAMOTO EARTHQUAKE

2018 ◽  
Vol 5 (2) ◽  
Author(s):  
Tomiya Takatani ◽  
Hayato Nishikawa
Keyword(s):  
Process Analysis ◽  
Ground Surface ◽  
Seismic Damage ◽  
2016 Kumamoto Earthquake ◽  
Damage Prediction ◽  
Kumamoto Earthquake ◽  
Seismic Fault ◽  
Prediction Function ◽  
The 2016 Kumamoto Earthquake ◽  
Wooden House

Thousands of wooden houses were destroyed by the 2016 Kumamoto Earthquake. A seismic damage prediction function for wooden houses taking into consideration the consecutive strong earthquake motions, the amplification effect of ground surface layer, and the rupture propagation effect of seismic fault was proposed in this paper. Relationship between three ground characteristics above mentioned and the seismic damage for wooden house in the 2016 Kumamoto earthquake was analytically investigated by 3-D collapsing process analysis. The maximum drift angle was evaluated in this collapsing analysis of two-story wooden house.

scholarly journals Characteristics of the surface ruptures associated with the 2016 Kumamoto earthquake sequence, central Kyushu, Japan

2016 ◽  
Vol 68 (1) ◽  
Author(s):  
Yoshiki Shirahama ◽  
Masayuki Yoshimi ◽  
Yasuo Awata ◽  
Tadashi Maruyama ◽  
Takashi Azuma ◽  
...  
Keyword(s):  
Earthquake Sequence ◽  
2016 Kumamoto Earthquake ◽  
Kumamoto Earthquake ◽  
The 2016 Kumamoto Earthquake ◽  
Surface Ruptures

scholarly journals Seismic damage analysis on the river levees reinforced with steel sheet pile by the 2016 Kumamoto earthquake

2020 ◽  
Vol 15 (2) ◽  
pp. 395-404
Author(s):  
Kiyonobu KASAMA ◽  
Shuhei YAMAMOTO ◽  
Makoto OHNO ◽  
Hirotoshi MORI ◽  
Shinichi TSUKAMOTO ◽  
...  
Keyword(s):  
Steel Sheet ◽  
Seismic Damage ◽  
Damage Analysis ◽  
Sheet Pile ◽  
2016 Kumamoto Earthquake ◽  
Kumamoto Earthquake ◽  
The 2016 Kumamoto Earthquake

scholarly journals Postseismic Deformation Following the 2016 Kumamoto Earthquake Detected by ALOS-2/PALSAR-2

2020 ◽  
Author(s):  
Manabu Hashimoto
Keyword(s):  
Surface Deformation ◽  
Postseismic Deformation ◽  
Mountainous Area ◽  
2016 Kumamoto Earthquake ◽  
Ionospheric Correction ◽  
Kumamoto Earthquake ◽  
The 2016 Kumamoto Earthquake ◽  
Aso Caldera ◽  
Surface Ruptures ◽  
High Coherence

Abstract We have been conducting study of postseismic deformation following the 2016 Kumamoto earthquake using ALOS-2/PALSAR-2 acquired till 2018. We apply ionospheric correction to interferograms of ALOS-2/PALSAR-2. L-band SAR gives us high coherence enough to reveal surface deformation even in vegetated or mountainous area for pairs of images acquired more than 2 years. Ionospheric disturbances are seen both in the ascending and descending images, but spatial characteristics may be different each other. Postseismic deoformation following the Kumamoto earthquake is much larger than those observed after recent inland earthquakes in Japan with GPS, which exceeds 10 cm during two years at some spots in and around Kumamoto city and Aso caldera. There are sharp changes across several coseismic surface ruptures such as Futagawa, Hinagu and Idenokuchi faults. Time constant of postseismic decay ranges from 1 month to 600 days at selected points, but that LOS changes during the first epochs or two are dominant. This result suggests multiple source of postseismic deformation. LOS changes around the Hinagu and Suinzenji faults that appeared during the mainshock in Kumamoto City may be explained with right lateral afterslip on these faults. LOS changes around the Hinagu and Idenokuchi faults cannot be explained with right-lateral afterslip, which requires another unknown source. Deformation in northern part of Aso caldera may be the result of right lateral afterslip on unknown fault.

scholarly journals An Investigation of Damage Mechanism Induced by Earthquake in a Plate Girder Bridge Based on Seismic Response Analysis: Case Study of Tawarayama Bridge under the 2016 Kumamoto Earthquake

2018 ◽  
Vol 2018 ◽  
pp. 1-19 ◽  
Author(s):  
Mya Nan Aye ◽  
Akira Kasai ◽  
Mitsuhiro Shigeishi
Keyword(s):  
Dynamic Response ◽  
Seismic Response ◽  
Damage Mechanism ◽  
Response Analysis ◽  
2016 Kumamoto Earthquake ◽  
Seismic Response Analysis ◽  
Damage Survey ◽  
Kumamoto Earthquake ◽  
The 2016 Kumamoto Earthquake ◽  
Girder Bridge

This paper reports a damage survey and seismic analysis of a bridge. In the first part, the damage survey of some bridges that were affected by the 2016 Kumamoto Earthquake was discussed. Among these bridges, the Tawarayama Bridge, which is a plate girder bridge located very close to an active fault line, was particularly considered. This bridge incurred severe damage because of the earthquakes’ epicenters very close to the bridge. The damage mechanism that can occur in this type of bridge was elucidated. During the damage survey, parts of Tawarayama Bridge were examined to determine the damage in order to examine the factors of occurrence and damage mechanism. In the second part, the seismic responses of Tawarayama Bridge were analyzed using ABAQUS software, and beam elements were applied for the structural members. Firstly, the time-history responses were analyzed using both longitudinal and transverse direction earthquake ground motions separately and simultaneously to investigate the dynamic response of the bridge. Both undamped and damped conditions were considered. For the dynamic response analysis, the recorded earthquake acceleration data of Ozu Station were applied for both undamped and damped conditions considering both east-west (EW) and north-south (NS) directions simultaneously and the damped condition for these directions separately. In addition, a damped model was analyzed by applying design earthquake input data obtained from the Japanese Seismic Design Specifications for Highway Bridges. Consequently, five cases were established for seismic response analysis. Subsequently, the seismic responses of Tawarayama Bridge were investigated, and the behavior of the lower lateral members was examined considering the observed buckling of these members during the damage survey. The field survey and dynamic response analysis indicate that the buckling design of the lower lateral members should be considered in the future design of bridges.

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