scholarly journals Seismic Response of Two Engineering-Geological Sites of the Kanevskaya Pumped Storage Power Plant Territory

2021 ◽  
pp. 232-237
Author(s):  
Yuliya Semenova
Keyword(s):  
Free Surface ◽  
Power Plant ◽  
Shear Strain ◽  
Seismic Response ◽  
Seismic Effect ◽  
Frequency Characteristics ◽  
Soil Conditions ◽  
Local Soil ◽  
Fourier Spectra ◽  
Pumped Storage

The article examines the influence of the peculiarities of local soil conditions on the manifestations of earthquakes on the free surface on the example of the territory of the Kanevskaya pumped storage power plant. The study area was divided into 2 engineering-geological sites with the expected different seismic effect. A comparison is made of the frequency characteristics of the soil of both plots and the maximum values of the amplitude Fourier spectra on the free surface, obtained as envelopes of the Fourier spectra calculated for 26 input seismic motions. The change with the depth of peak shear strain in soil sections of both sites is also considered.

scholarly journals Seismic response of various sites of the territory of Kyiv to seismic loads

2021 ◽  
Vol 43 (5) ◽  
pp. 150-164
Author(s):  
O. V. Kendzera ◽  
Yu. V. Semenova
Keyword(s):  
Seismic Hazard ◽  
Seismic Response ◽  
Soil Layer ◽  
Maximum Amplitude ◽  
Design Parameters ◽  
Soil Conditions ◽  
Seismic Loads ◽  
Potential Hazard ◽  
Local Soil ◽  
Seismic Vibrations

The research presented in the work aims to assess the seismic response of three different taxonometric sites, identified by the method of engineering and geological analogies within the territory of Kyiv, to seismic loads with different spectral content and peak amplitude from 0.01 g to 0.06 g. Assessment of the influence of local soil conditions on the intensity of earthquakes is an important task of earthquake-resistant design and construction. The soil layer at the base of the study site acts as a filter on seismic vibrations. It amplifies or attenuates the amplitude of the seismic wave propagating from the bedrock to the free surface. The paper considers the mechanisms of the possible amplification of seismic motions by various soil complexes and methods for calculating the seismic response to seismic loads of various intensities. As an analytical tool for analyzing the response of the taxonometric areas to seismic vibrations (seismic response), an equivalent linear analysis was used, which is comprehensively studied and widely used in engineering seismology. For the selected sites, models of soil strata were built, and graphs of changes with depth of peak shear strain and peak ground acceleration (PGA) were calculated, as well as predicted (expected with a given probability of non-exceeding) amplitude Fourier spectra of seismic motions in the upper layer and the response spectra of single oscillators with 5 % attenuation to seismic effects with a maximum amplitude from 0.01 g to 0.06 g. A comparative analysis of the change in the value of these parameters in individual sections of Kyiv is presented. It is shown that to assess the potential hazard from seismic ground motions during earthquakes, it is necessary to use the maximum number of design parameters that characterize the seismic hazard of specific areas and which are used to determine the seismic resistance of buildings and structures. The most complete seismic hazard for calculating the seismic stability of objects is set by the full vector of seismic motions deployed in time: calculated accelerograms, seismograms and velocigrams. The presented calculation results are planned to be used in solving methodological and practical problems of earthquake protection, which can be realized in different parts of the territory of Kyiv.

Case Study: Effect of Soil-Structure Interaction and Ground Motion Incoherency on Nuclear Power Plant Structures

2009 ◽  
Author(s):  
Jim Xu ◽  
Sujit Samaddar
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Seismic Response ◽  
Ground Motion ◽  
Nuclear Power ◽  
Soil Structure ◽  
Soil Structure Interaction ◽  
Soil Conditions ◽  
Structure Interaction

The soil-structure interaction (SSI) has a significant impact on nuclear power plant (NPP) structures, especially for massive and rigid structures founded on soils, such as containments. The U.S. Nuclear Regulatory Commission’s (NRC) Standard Review Plan (SRP) provides the requirement and acceptance criteria for incorporating the SSI effect in the seismic design and analyses of NPP structures. The NRC staff uses the SRP for safety review of license applications. Recent studies have indicated that ground motions in recorded real earthquake events have exhibited spatial incoherency in high-frequency contents. Several techniques have been developed to incorporate the incoherency effect in the seismic response analyses. Section 3.7.2 of Revision 3 of the SRP also provided guidance for use in the safety evaluation of seismic analyses considering ground motion spatial incoherency effect. This paper describes a case study of the SSI and incoherency effects on seismic response analyses of NPP structures. The study selected a typical containment structure. The SSI model is generated based on the typical industry practice for SSI computation of containment structures. Specifically, a commercial version of SASSI was used for the study, which considered a surface-founded structure. The SSI model includes the foundation, represented with brick elements, and the superstructure, represented using lumped mass and beams. The study considered various soil conditions and ground motion coherency functions to investigate the effect of the range of soil stiffness and the ground motion incoherency effect on SSI in determining the seismic response of the structures. This paper describes the SSI model development and presents the analysis results as well as insights into the manner in which the SSI and incoherency effects are related to different soil conditions.

scholarly journals Mitigation of seismic hazard of a megacity: the case of Naples

1995 ◽  
Vol 38 (5-6) ◽  
Author(s):  
C. Nunziata ◽  
D. Fah ◽  
G. F. Panza
Keyword(s):  
Seismic Response ◽  
Sedimentary Cover ◽  
Finite Difference Methods ◽  
Seismic Source ◽  
Soil Conditions ◽  
Pyroclastic Rock ◽  
Hybrid Technique ◽  
Sh Waves ◽  
Local Soil ◽  
Propagation Of Waves

The seismic ground motion of a test area in the eastern district of Naples was computed with a hybrid technique based on the rnode surnrnation and the finite difference methods. This technique allowed the realistic modelling of source and propagation effects, including local soil conditions. In the modelling, as seismic source we considered the 1980 Irpinia earthquake, a good example of strong shaking for the area of Naples, located about 90 km from the source. Along a profile through Naples, trencling N86°W, the subsoil is mainly formed by alluvial (ash, stratified sand and peat) and pyroclastic materials overlying a pyroclastic rock (yellow Neapolitan tuff) representing the Neapolitan bedrock. The detailed information available on the subsoil mechanical properties and its geometry warrants the application of the sophisticated hybrid technique. For SH waves, a comparison was made between a realistic 2-D seismic response and a standard I-D response, based on the vertical propagation of waves in a plane layered structure. As expected the sedimentary cover caused an increase in the signal's amplitudes and duration. If a thin uniform peat layer is present, the amplification effects are reduced, and the peak ground accelerations are similar to those observed for the bedrock model. This can be explained by the backscattering of wave energy at such a laqer. The discrepancies evidenced between the l -D and the 2-D seismic response suggest that serious caution must be taken in the formulation of seismic regulations. This is particularly true in the presence of the thin peat laqer where the misinatch between the l -D and the 2-D amplification functions is particularly evident in correspondence of the dominant peak and of the second significant peak.

Wave-passage effect on the seismic response of suspension bridges considering local soil conditions

2017 ◽  
Vol 17 (2) ◽  
pp. 501-513 ◽  
Author(s):  
Süleyman Adanur ◽  
Ahmet Can Altunışık ◽  
Hasan Basri Başağa ◽  
Kurtuluş Soyluk ◽  
A. Aydın Dumanoğlu
Keyword(s):  
Seismic Response ◽  
Soil Conditions ◽  
Suspension Bridges ◽  
Passage Effect ◽  
Local Soil ◽  
Local Soil Conditions ◽  
Wave Passage ◽  
Wave Passage Effect

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).

Research and Develop on Static Frequency Converter of Pumped Storage Power Plant

2012 ◽  
Vol 608-609 ◽  
pp. 1120-1126 ◽  
Author(s):  
De Shun Wang ◽  
Bo Yang ◽  
Lian Tao Ji
Keyword(s):  
Power Plant ◽  
Control Strategy ◽  
Large Scale ◽  
Frequency Converter ◽  
Position Estimation ◽  
Position Sensor ◽  
Storage Unit ◽  
Rotor Position ◽  
Start Up ◽  
Pumped Storage

A static frequency converter start-up control strategy for pumped-storage power unit is presented. And rotor position detecting without position sensor is realized according to voltage and magnetism equations of ideal synchronous motor mathematics model. The mechanism and implementation method of initial rotor position determination and rotor position estimation under low frequency without position sensor are expounded and validated by simulations. Based on the mentioned control strategy, first set of a static frequency converter start-up device in China for large-scale pumped-storage unit is developed, which is applied to start-up control test in the 90 MW generator/motor of Panjiakou Pumped-storage Power Plant. Test results show that rotor position detecting, pulse commutation, natural commutation, and unit synchronous procedure control of static start-up are all proved. The outcomes have been applied in running equipment, which proves the feasibility of mentioned method.

scholarly journals Morphological Characterization of Root System Architecture in Diverse Tomato Genotypes during Early Growth

2018 ◽  
Vol 19 (12) ◽  
pp. 3888 ◽  
Author(s):  
Aurora Alaguero-Cordovilla ◽  
Francisco Gran-Gómez ◽  
Sergio Tormos-Moltó ◽  
José Pérez-Pérez
Keyword(s):  
Root System ◽  
System Architecture ◽  
Lateral Root ◽  
Morphological Plasticity ◽  
Root System Architecture ◽  
Morphological Characterization ◽  
Early Growth ◽  
Soil Conditions ◽  
Wild Tomato Species ◽  
Local Soil

Plant roots exploit morphological plasticity to adapt and respond to different soil environments. We characterized the root system architecture of nine wild tomato species and four cultivated tomato (Solanum lycopersicum L.) varieties during early growth in a controlled environment. Additionally, the root system architecture of six near-isogenic lines from the tomato ‘Micro-Tom’ mutant collection was also studied. These lines were affected in key genes of ethylene, abscisic acid, and anthocyanin pathways. We found extensive differences between the studied lines for a number of meaningful morphological traits, such as lateral root distribution, lateral root length or adventitious root development, which might represent adaptations to local soil conditions during speciation and subsequent domestication. Taken together, our results provide a general quantitative framework for comparing root system architecture in tomato seedlings and other related species.

Seawater pumped-storage power plant in Okinawa island, Japan

1993 ◽  
Vol 35 (3-4) ◽  
pp. 237-246 ◽  
Author(s):  
Akitaka Hiratsuka ◽  
Takashi Arai ◽  
Tsukasa Yoshimura
Keyword(s):  
Power Plant ◽  
Okinawa Island ◽  
Pumped Storage

Advanced Governor Controller for Pumped-Storage Power Plant and Its Simulation Tool

2006 ◽  
Author(s):  
Kazunori Iwabuchi ◽  
Yasuo Takagi ◽  
Tadashi Konnai ◽  
Yuusuke Nakahara ◽  
Kazumasa Kubota ◽  
...  
Keyword(s):  
Power Plant ◽  
Simulation Tool ◽  
Pumped Storage

An experiment in the control of the ground water-level in a fen peat soil

1951 ◽  
Vol 41 (1-2) ◽  
pp. 149-162 ◽  
Author(s):  
H. H. Nicholson ◽  
G. Alderman ◽  
D. H. Firth
Keyword(s):  
Ground Water ◽  
Water Level ◽  
Large Scale ◽  
Field Experiments ◽  
Peat Soil ◽  
Climatic Conditions ◽  
Ground Water Level ◽  
Effective Control ◽  
Soil Conditions ◽  
Local Soil

1. The methods of investigation of the effect of ground water-level on crop growth, together with tho field installations in use, are discussed.2. Direct field experiments are handicapped by the difficulties of achieving close control on a sufficiently large scale, due to considerable variations of surface level and depth of peat within individual fields and to rapid fluctuations in rainfall and evaporation. Many recorded experiments are associated with climatic conditions of substantial precipitation during the growing season.3. Seasonal fluctuations of ground water-level in Fen peat soils in England, in natural and agricultural conditions, are described.4. The local soil conditions are outlined and the implications of profile variations are discussed.5. The effective control of ground water-level on a field scale requires deep and commodious ditches and frequent large underdrains to ensure the movement of water underground with sufficient freedom to give rapid compensatory adjustment for marked disturbances of ground water-level following the incidence of heavy rain or excessive evaporation.6. A working installation for a field experiment in ordinary farming conditions is described and the measure of control attained is indicated.

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