ANALYSIS OF LOCAL SITE EFFECTS ON SEISMIC RESPONSE OF FRAME STRUCTURES SUPPORTED BY FOUNDATIONS AT DIFFERENT ELEVATIONS

2019 ◽  
Vol 3 (Special Issue on First SACEE'19) ◽  
pp. 181-190
Author(s):  
Yangyang Tang ◽  
Yingmin Li ◽  
Zongming Huang ◽  
Liping Liu ◽  
Yishun Ding ◽  
...  
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Ground Motions ◽  
Site Effect ◽  
Frame Structure ◽  
Frame Structures ◽  
Soil Conditions ◽  
Local Site Effect ◽  
Local Site ◽  
Set Up

Frame structures supported by foundations with different elevations (such as a structure on the slope) undergo different ground motions because of the local site effect. Seismic response of the structure under non-uniform excitation of ground motion is different from that under uniform excitation on upper embedding end or lower embedding end. Sites with the same height difference and different soil conditions were set up in this paper to subject them to ground motions related to different positions and the seismic response of structures built on the sites under uniform and non-uniform strong seismic excitation were compared. The results show that the predominant period and amplitude of ground motions on upper embedding end and lower embedding end are different and affected by soil conditions. The extent and law of amplification of shear force, displacement and storey drift of structures under non-uniform excitation differ from those under uniform excitation when soil changes from soft to medium-hard soil. In addition, the position and degree of plastic hinges change under non-uniform excitation compared to uniform excitation. The uniform excitation using the ground motion on the upper embedding end is not always safe for the frame structure supported by foundations at different elevations.

Contribution of local site-effect on the seismic response of suspension bridges to spatially varying ground motions

2016 ◽  
Vol 10 (5) ◽  
pp. 1233-1251 ◽  
Author(s):  
Suleyman Adanur ◽  
Ahmet C. Altunisik ◽  
Kurtulus Soyluk ◽  
A. Aydin Dumanoglu ◽  
Alemdar Bayraktar
Keyword(s):  
Seismic Response ◽  
Ground Motions ◽  
Site Effect ◽  
Suspension Bridges ◽  
Local Site Effect ◽  
Local Site ◽  
Spatially Varying Ground Motions ◽  
Spatially Varying

scholarly journals Seismic hazard assessment and local site effect evaluation in Hanoi, Vietnam

2017 ◽  
Vol 17 (4B) ◽  
pp. 82-95
Author(s):  
Nguyen Anh Duong ◽  
Pham Dinh Nguyen ◽  
Vu Minh Tuan ◽  
Bui Van Duan ◽  
Nguyen Thuy Linh
Keyword(s):  
Seismic Hazard ◽  
Shear Wave ◽  
Ground Motion ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Peak Ground Acceleration ◽  
Site Effect ◽  
Local Site Effect ◽  
Ground Acceleration ◽  
Local Site

In this study, we have carried out the probabilistic seismic hazard analysis in Hanoi based on the latest seismotectonic data. The seismic hazard map shows peak ground acceleration values on rock corresponding to the 10% probability of exceedance in a 50-year time period (approximately return periods of 500 years). The calculated results reveal that the maximum ground acceleration can occur on rock in Hanoi is about 0.13 g corresponding to the shaking intensity level of VIII on the MSK-64 scale. The ground motion values calculated on rock vary according to the local site conditions. We have evaluated and corrected the local site effects on ground motion in Ha Dong district, Hanoi by using microtremor and borehole data. The Nakamura’s H/V spectral ratio method has been applied to establish a map of ground dominant periods in Ha Dong with a TS range of 0.6 - 1.2 seconds. The relatively high values of periods indicate that Ha Dong has soft soil and thick Quaternary sediments. The sediment thickness in Ha Dong is calculated to vary between 30 - 75 m based on ground dominant periods and shear wave velocity VS30 = 171 - 254 m/s. The results of local site effect on ground motion show that the 500-year return period peak ground acceleration in Ha Dong ranges from 0.13 g to 0.17 g. It is once again asserted that the seismic hazard in Hanoi is a matter of great concern, due not only to the relatively high ground acceleration, but also to the seismic characteristics of soil (low shear wave velocity, ground dominant period of approximately 1 second).

Study on the Simulation of Spatial Variable Seismic Ground Motion Considering Local Site Convergence

2012 ◽  
Vol 446-449 ◽  
pp. 2379-2386
Author(s):  
Zhi Ming You ◽  
Zhi Xiang Cao
Keyword(s):  
Ground Motion ◽  
Conventional Method ◽  
Random Phase ◽  
Spatial Coherence ◽  
Site Effect ◽  
Actual State ◽  
Local Site Effect ◽  
Seismic Ground Motion ◽  
Traveling Wave Effect ◽  
Local Site

By modifying the Random phase angle ,conventional method of ground motion simulation is improved .The simulated result that used conventional method have a good astringency on the limited site and more reasonable to accord with actual state of seismic. To make the simulated result with variability in space and time, simulated progress considered not only the traveling wave effect, but also the spatial coherence of the seismic ground motion and local site effect.

Nonlinear Seismic Response of Special-Shaped Column Frame Structures

2010 ◽  
Vol 163-167 ◽  
pp. 1222-1225
Author(s):  
Xiao Bin Han ◽  
Chun Sheng Bao ◽  
Ying Gao ◽  
Jian Min Bian
Keyword(s):  
Spatial Analysis ◽  
Seismic Response ◽  
Seismic Performance ◽  
Nonlinear Dynamic ◽  
Ground Motions ◽  
Nonlinear Dynamic Analysis ◽  
Frame Structure ◽  
Frame Structures ◽  
Analysis Model ◽  
Nonlinear Seismic Response

The spatial analysis model of special-shaped column frame structure is established in ANSYS. The nonlinear dynamic analysis is carried out for the structure by inputting ground motions in one direction. The seismic performance of the structure under rare seismic actions was examined and whether the structure achieved the predetermined seismic aims is evaluated. The results indicates that the structure which under the 8-degree zone designed according to the codes can achieve the predetermined seismic aims under the rarely occurred earthquake actions.

scholarly journals EVALUATION OF GROUND CONDITIONS AND OCCURRENCE OF LOCAL SITE EFFECT

2015 ◽  
Author(s):  
Р.Р. Дургарян ◽  
М.А. Аванесян ◽  
С.Г. Бабаян ◽  
М.Р. Геворгян ◽  
Г.Е. Бабаян ◽  
...  
Keyword(s):  
Site Effect ◽  
Soil Condition ◽  
Seismic Effect ◽  
Soil Conditions ◽  
Mass Casualties ◽  
Adjacent Area ◽  
Local Site Effect ◽  
Local Site ◽  
Local Soil ◽  
Ground Conditions

В работе приводятся данные детальных геофизических и геологических наблюдений, проведенных с целью оценки грунтовых условий и возможности возникновения локального сейсмического эффекта на территории Двинского городища при землетрясениях 863, 893 гг. Исследования были проведены на участках с наибольшими макросейсмическими воздействиями центральный квартал города Двин и сопредельный участок кафедрального собора. Анализ полученных данных относительно грунтовых условий динамические характеристики собственных колебаний, локальные резонансные характеристики, средние скорости поперечных упругих волн первых тридцати метров (Vs-30) позволяют сделать вывод, что высокая интенсивность обоих Двинских землетрясений, приведших к разрушению и массовой гибели людей, обусловлена локальными усилениями сейсмических колебаний (site effect). In the study the data on detailed geophysical and geological observations aimed to the assessment of local soil conditions and possibility of local seismic effect occurrence in the territory of Dvin ancient settlement during the earthquakes of 863 and 893 are presented. The studies have been carried out at the sites with the largest macroseismic impact central block of the town of Dvin and adjacent area of the Cathedral. Analysis of the obtained soil condition data dynamic characteristics of the natural frequency, local resonance characteristics, shear wave average velocity in upper 30 meters of subsurface stratum (VS30) allowed to conclude that the high intensity of both Dvin earthquakes caused destructions and mass casualties were conditioned by local amplification of seismic vibration (site effect).

scholarly journals The 30 October 2020 Samos (Eastern Aegean Sea) Earthquake: effects of source rupture, path and local-site conditions on the observed and simulated ground motions

2021 ◽  
Author(s):  
Aybige Akinci ◽  
Daniele Cheloni ◽  
AHMET ANIL DINDAR
Keyword(s):  
Ground Motion ◽  
Structural Damage ◽  
Ground Motions ◽  
Aegean Sea ◽  
Peak Ground Velocity ◽  
Ground Shaking ◽  
Local Site ◽  
Eastern Aegean ◽  
Motion Characteristics ◽  
Eastern Aegean Sea

Abstract On 30 October 2020 a MW 7.0 earthquake occurred in the eastern Aegean Sea, between the Greek island of Samos and Turkey’s Aegean coast, causing considerable seismic damage and deaths, especially in the Turkish city of Izmir, approximately 70 km from the epicenter. In this study, we provide a detailed description of the Samos earthquake, starting from the fault rupture to the ground motion characteristics. We first use Interferometric Synthetic Aperture Radar (InSAR) and Global Positioning System (GPS) data to constrain the source mechanisms. Then, we utilize this information to analyze the ground motion characteristics of the mainshock in terms of peak ground acceleration (PGA), peak ground velocity (PGV), and spectral pseudo-accelerations. Modelling of geodetic data shows that the Samos earthquake ruptured a NNE-dipping normal fault located offshore north of Samos, with up to 2.5-3 m of slip and an estimated geodetic moment of 3.3 ⨯ 1019 Nm (MW 7.0). Although low PGA were induced by the earthquake, the ground shaking was strongly amplified in Izmir throughout the alluvial sediments. Structural damage observed in Izmir reveals the potential of seismic risk due to the local site effects. To better understand the earthquake characteristics, we generated and compared stochastic strong ground motions with the observed ground motion parameters as well as the ground motion prediction equations (GMPEs), exploring also the efficacy of the region-specific parameters which may be improved to better predict the expected ground shaking from future large earthquakes in the region.

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