Reduction of seismic input motion through adjusting contact length of foundation side walls to surrounding medium

2018 ◽  
Vol 27 (18) ◽  
pp. e1546
Author(s):  
Pouran Fallahzadeh Farashahi ◽  
Hossein Jahankhah
Keyword(s):  
Surrounding Medium ◽  
Contact Length ◽  
Seismic Input ◽  
Side Walls ◽  
Input Motion

Analysis and Evaluation of the Liquefaction on Layered Soil

2002 ◽  
Author(s):  
Sang Hoon Lee ◽  
Kwang Hoon Yoo
Keyword(s):  
Nuclear Power ◽  
Time History ◽  
The Other ◽  
Liquefaction Potential ◽  
Analysis And Evaluation ◽  
Seismic Input ◽  
The Us ◽  
Input Motion ◽  
Maximum Shear Strength ◽  
Typical Soil

Liquefaction potential on the specific site of nuclear power plant is analyzed and reviewed. The layered site for this study consists of silt and sand. Based on the limited available soil data, maximum shear strength at critical locations using Seed & Idriss method and computer program SHAKE is calculated, and liquefaction potential is reviewed. As seismic input motion used for the assessment of liquefaction, the artificial time history compatible with the US NRC Regulatory Guide 1.60 is used. Assessment results of the liquefaction are validated by analyzing to the other typical soil foundations which can show the effects on the foundation depth and soil data.

scholarly journals Eliminating Conservatism in the Piping System Analysis Process Through Application of a Suite of Locally Appropriate Seismic Input Motions

2009 ◽  
Author(s):  
Anthony L. Crawford ◽  
Robert E. Spears ◽  
Mark J. Russell
Keyword(s):  
System Analysis ◽  
Seismic Analysis ◽  
Interaction Analysis ◽  
Department Of Energy ◽  
Piping System ◽  
Total Uncertainty ◽  
Seismic Input ◽  
Nuclear Systems ◽  
Computationally Intensive ◽  
Input Motion

Seismic analysis is of great importance in the evaluation of nuclear systems due to the heavy influence such loading has on their designs. Current Department of Energy seismic analysis techniques for a nuclear safety-related piping system typically involve application of a single conservative seismic input applied to the entire system [1]. A significant portion of this conservatism comes from the need to address the overlapping uncertainties in the seismic input and in the building response that transmits that input motion to the piping system. The approach presented in this paper addresses these two sources of uncertainty through the application of a suite of 32 earthquake realizations with equal probability of occurrence whose collective performance addresses the total uncertainty while each individual motion represents a single variation of it. It represents an extension of the soil-structure interaction analysis methodology of SEI/ASCE 43-05 [2] from the structure to individual piping components. Because this approach is computationally intensive, automation and other measures have been developed to make such an analysis efficient. These measures are detailed in this paper.

Seismic Input Motion Determined from a Surface-Downhole Pair of Sensors: A Constrained Deconvolution Approach

2010 ◽  
Vol 100 (3) ◽  
pp. 1375-1380 ◽  
Author(s):  
D. Bindi ◽  
S. Parolai ◽  
M. Picozzi ◽  
A. Ansal
Keyword(s):  
Seismic Input ◽  
Input Motion

Seismic Input Motion Identification in a Heterogeneous Halfspace

2018 ◽  
Vol 144 (8) ◽  
pp. 04018070 ◽  
Author(s):  
C. Jeong ◽  
E. Esmaeilzadeh Seylabi
Keyword(s):  
Seismic Input ◽  
Input Motion

The Fine Structure of Rat Granulosa Cell Cultures Correlated with Progestin Secretion

1973 ◽  
Vol 31 ◽  
pp. 552-553
Author(s):  
T. M. Crisp ◽  
F.R. Denys
Keyword(s):  
Fine Structure ◽  
Granulosa Cell ◽  
Cell Cultures ◽  
Single Injection ◽  
Surrounding Medium ◽  
Petri Dish ◽  
Female Rats ◽  
Vaginal Smear ◽  
Immature Female ◽  
Serum Gonadotropin

The purpose of this paper is to present observations on the fine structure of rat granulosa cell cultures grown in the presence of an adenohypophyseal explant and to correlate the morphology of these cells with progestin secretion. Twenty-six day old immature female rats were given a single injection of 5 IU pregnant mares serum gonadotropin (PMS) in order to obtain ovaries with large vesicular follicles. At 66 hrs. post-PMS administration (estrus indicated by vaginal smear cytology), the ovaries were removed and placed in a petri dish containing medium 199 and 100 U penicillin/streptomycin (P/S)/ml. Under a 20X magnification dissecting microscope, some 5-8 vesicular follicles/ovary were punctured and the granulosa cells were expressed into the surrounding medium. The cells were transferred to centrifuge tubes and spun down at 1000 rpm for 5 mins.

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