SEISMIC DAMAGE PREDICTION OF OLD JAPANESE-STYLE WOODEN HOUSE USING PREDOMINANT PERIOD DISTRIBUTION OF GROUND SURFACE LAYER

2016 ◽  
Vol 3 (2) ◽  
Author(s):  
Tomiya Takatani ◽  
Hayato Nishikawa
Keyword(s):  
Earthquake Engineering ◽  
Strong Earthquake ◽  
Ground Surface ◽  
Seismic Damage ◽  
Seismic Intensity ◽  
Earthquake Ground Motion ◽  
Accurate Estimation ◽  
Weighting Method ◽  
Damage Prediction ◽  
Wooden House

In general, the evaluation of a site amplification effect is very important in earthquake engineering when a seismic damage to wooden house with a low seismic performance against a strong earthquake will be predicted by an accurate estimation of the seismic intensity at surface ground. In this paper, both horizontal and vertical microtremors at 51 measuring sites in the west district in Maizuru city were measured by servo type accelerometers, and also the predominant periods at 727 sites in the same area were numerically estimated from the predominant periods measured at 51 sites using the Inverse Distance Weighting method. Moreover, a seismic damage prediction of wooden house against a strong earthquake ground motion was conducted by a relationship between a seismic damage function and a maximum drift angle of wooden house.

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.

SEISMIC PERFORMANCE OF AN OLD JAPANESE-STYLE TWO-STORY WOODEN HOUSE UNDER A STRONG EARTHQUAKE GROUND MOTION

2016 ◽  
Vol 3 (2) ◽  
Author(s):  
Tomiya Takatani ◽  
Hayato Nishikawa
Keyword(s):  
Ground Motion ◽  
Seismic Performance ◽  
Strong Earthquake ◽  
Process Analysis ◽  
Seismic Intensity ◽  
Japan Meteorological Agency ◽  
Earthquake Ground Motion ◽  
Wooden House ◽  
Old Japanese ◽  
Upper Level

In Japan, there is a serious and urgent issue on seismic retrofit for a lot of old Japanese-style two-story wooden houses built by a Japanese traditional framed-construction method. In order to investigate the seismic performance of an old Japanese-style two-story wooden house, 3-D non-linear collapsing process analysis of this wooden house was conducted against a strong earthquake ground motion with the Japan Meteorological Agency seismic intensity of “6 upper” level. The effect of post fixing condition under the floor of wooden house on the seismic response of an old Japanese-style two-story wooden house was numerically investigated in this paper. As a result, it was found that seismic collapsing behavior of the wooden house strongly depends on the post fixing condition under its first floor.

ESTIMATION OF PREDOMINANT PERIOD OF GROUND SURFACE LAYER USING THE INVERSE DISTANCE WEIGHTING METHOD

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Hayato Nishikawa ◽  
Tomiya Takatani
Keyword(s):  
Earthquake Engineering ◽  
Ground Surface ◽  
Spectral Ratio ◽  
Inverse Distance Weighting ◽  
Accurate Estimation ◽  
Weighting Method ◽  
Ratio Measurement ◽  
Predominant Period ◽  
Distance Weighting ◽  
Inverse Distance

The evaluation of a site amplification effect is very important in the earthquake engineering when an earthquake damage distribution of wooden house will be predicted by an accurate estimation of seismic intensity. A predominant period in the microtremor H/V spectral ratio at ground surface corresponds to the natural period of surface ground layer. The microtremor H/V spectral ratio measurement was applied to the east district in Maizuru city. Both horizontal and vertical microtremors at 75 sites in the east district in Maizuru city were measured by servo type accelerometers, and the microtremor H/V spectral ratio and its predominant period at each site were evaluated from microtremor accelerations. Also, the predominant periods at 353 sites were numerically evaluated from the predominant periods measured at 75 sites by the Inverse Distance Weighting method.

SEISMIC COLLAPSING ANALYSIS OF ONE-STORY WOODEN KINDERGARTEN STRUCTURE AGAINST STRONG EARTHQUAKE GROUND MOTION

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Tomiya Takatani ◽  
Hayato Nishikawa
Keyword(s):  
Ground Motion ◽  
Strong Earthquake ◽  
Process Analysis ◽  
Ground Motions ◽  
Seismic Intensity ◽  
Earthquake Ground Motion ◽  
Intensity Level ◽  
Wooden Structure ◽  
Old Japanese ◽  
Upper Level

3-D collapsing process analysis of an old Japanese-style one-story wooden structure under two strong earthquake ground motions with a seismic intensity level was car-ried out in order to investigate the seismic performance of this one-story wooden structure without/with seismic retrofit. As a result, this wooden structure collapsed against a strong earthquake ground motion with the JMA seismic intensity “6 upper” level.

SEISMIC COLLAPSING ANALYSIS OF THREE-STORY WOODEN HOTEL

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Tomiya Takatani ◽  
Hayato Nishikawa
Keyword(s):  
Strong Earthquake ◽  
Surface Soil ◽  
Process Analysis ◽  
Ground Motions ◽  
Soil Layer ◽  
Seismic Intensity ◽  
Earthquake Ground Motion ◽  
Earthquake Ground Motions ◽  
Old Japanese ◽  
Upper Level

A 3-D collapsing-process analysis of an old Japanese-style 3-story wooden hotel under strong earthquake ground motions was carried out with three seismic intensity levels to investigate its seismic performance. Three earthquake ground motions were evaluated from three ground boring data around this wooden hotel, using the non-linear amplification characteristics of surface soil layer above the engineering base rock. As a result, this wooden hotel collapsed against a strong earthquake ground motion with JMA seismic intensity of a “6 upper” level.

scholarly journals Seismic rocking effects on a mine tower under induced and natural earthquakes

2021 ◽  
Vol 21 (2) ◽  
Author(s):  
Piotr Adam Bońkowski ◽  
Juliusz Kuś ◽  
Zbigniew Zembaty
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Ground Surface ◽  
Tall Buildings ◽  
Earthquake Ground Motion ◽  
Seismic Action ◽  
Seismic Effects ◽  
Copper Ore ◽  
Rotational Components ◽  
Natural Earthquakes

AbstractRecent research in engineering seismology demonstrated that in addition to three translational seismic excitations along x, y and z axes, one should also consider rotational components about these axes when calculating design seismic loads for structures. The objective of this paper is to present the results of a seismic response numerical analysis of a mine tower (also called in the literature a headframe or a pit frame). These structures are used in deep mining on the ground surface to hoist output (e.g. copper ore or coal). The mine towers belong to the tall, slender structures, for which rocking excitations may be important. In the numerical example, a typical steel headframe 64 m high is analysed under two records of simultaneous rocking and horizontal seismic action of an induced mine shock and a natural earthquake. As a result, a complicated interaction of rocking seismic effects with horizontal excitations is observed. The contribution of the rocking component may sometimes reduce the overall seismic response, but in most cases, it substantially increases the seismic response of the analysed headframe. It is concluded that in the analysed case of the 64 m mining tower, the seismic response, including the rocking ground motion effects, may increase up to 31% (for natural earthquake ground motion) or even up to 135% (for mining-induced, rockburst seismic effects). This means that not only in the case of the design of very tall buildings or industrial chimneys but also for specific yet very common structures like mine towers, including the rotational seismic effects may play an important role.

scholarly journals Estimating snow water equivalent over long mountain transects using snowmobile-mounted ground-penetrating radar

Geophysics ◽  
2016 ◽  
Vol 81 (1) ◽  
pp. WA183-WA193 ◽  
Author(s):  
W. Steven Holbrook ◽  
Scott N. Miller ◽  
Matthew A. Provart
Keyword(s):  
Ground Penetrating Radar ◽  
Snow Water Equivalent ◽  
Ground Surface ◽  
Snow Accumulation ◽  
Accurate Estimation ◽  
Snow Density ◽  
Snow Stratigraphy ◽  
Flood Estimation ◽  
Snow Water ◽  
Ground Penetrating

The water balance in alpine watersheds is dominated by snowmelt, which provides infiltration, recharges aquifers, controls peak runoff, and is responsible for most of the annual water flow downstream. Accurate estimation of snow water equivalent (SWE) is necessary for runoff and flood estimation, but acquiring enough measurements is challenging due to the variability of snow accumulation, ablation, and redistribution at a range of scales in mountainous terrain. We have developed a method for imaging snow stratigraphy and estimating SWE over large distances from a ground-penetrating radar (GPR) system mounted on a snowmobile. We mounted commercial GPR systems (500 and 800 MHz) to the front of the snowmobile to provide maximum mobility and ensure that measurements were taken on pristine snow. Images showed detailed snow stratigraphy down to the ground surface over snow depths up to at least 8 m, enabling the elucidation of snow accumulation and redistribution processes. We estimated snow density (and thus SWE, assuming no liquid water) by measuring radar velocity of the snowpack through migration focusing analysis. Results from the Medicine Bow Mountains of southeast Wyoming showed that estimates of snow density from GPR ([Formula: see text]) were in good agreement with those from coincident snow cores ([Formula: see text]). Using this method, snow thickness, snow density, and SWE can be measured over large areas solely from rapidly acquired common-offset GPR profiles, without the need for common-midpoint acquisition or snow cores.

EVALUATION OF SEISMIC DEMANDS IN A CONTINUOUS BRIDGE

2001 ◽  
Vol 01 (02) ◽  
pp. 235-246 ◽  
Author(s):  
CHIN-HSIUNG LOH ◽  
SHIUAN WAN ◽  
YI-WEN CHANG
Keyword(s):  
Earthquake Engineering ◽  
Ground Motions ◽  
Hysteretic Behavior ◽  
Earthquake Ground Motion ◽  
Far Field ◽  
Base Shear ◽  
Near Fault ◽  
Seismic Design Code ◽  
Cyclic Loading Tests ◽  
Earthquake Characteristics

This paper examines the dynamic behavior of a highway RC-bridge subjected to both near-fault and far-field ground motions. The bridge consists of a hinge supported continuous girder with six concrete piers and the bridge is designed according to the Taiwan seismic design code. To investigate the hysteretic behavior of the bridge piers, cyclic loading tests were carried out at the National Center for Research on Earthquake Engineering (NCREE). The Chi-Chi earthquake ground motion record was adopted as the near-fault earthquake characteristics whereas another earthquake record was selected for the far-field earthquake characteristics. The ductility demands and base shear demands due to the near-fault and the far-field earthquake ground motions are compared and conclusions drawn from the study. The stipulation of code limitations and the present calculated demands are discussed.

Seismic Reduction and Control Analysis of Hybrid Structure with Viscous Dampers under Strong Earthquake

2014 ◽  
Vol 580-583 ◽  
pp. 1633-1636 ◽  
Author(s):  
Sen Qiu ◽  
Shu Cheng Deng ◽  
Zhao Quan Zhu
Keyword(s):  
Strong Earthquake ◽  
Lateral Displacement ◽  
Hybrid Structure ◽  
Earthquake Ground Motion ◽  
Control Analysis ◽  
Viscous Damper ◽  
Viscous Dampers ◽  
Maximum Value ◽  
Story Drift ◽  
And Control

This article focuses on the effect of viscous damper on seismic performance of steel-concrete hybrid structure under strong earthquake. The result shows that viscous damper has effect on seismic reduction and control. The story lateral displacement, story drift rotation and energy dissipation-seismic can be reduced effectively by viscous dampers. The maximum value of vibration-reduction ratio is 36.0%, 67.9%, 36.9%. It is different effect on seismic reduction by different earthquake ground motion. Response of earthquake amplifies under Pasadena earthquake wave than the others.

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