scholarly journals A parametric study of cylindrical pedicle screw design implications on the pullout performance using an experimentally validated finite-element model

2010 ◽  
Vol 32 (2) ◽  
pp. 145-154 ◽  
Author(s):  
Panagiotis E. Chatzistergos ◽  
Evangelos A. Magnissalis ◽  
Stavros K. Kourkoulis
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Pedicle Screw ◽  
Parametric Study ◽  
Element Model ◽  
Screw Design

Ultimate strength of columns laterally braced by girt–diaphragm systems

1989 ◽  
Vol 16 (3) ◽  
pp. 227-238 ◽  
Author(s):  
Bruno Massicotte ◽  
Denis Beaulieu ◽  
André Picard
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Ultimate Strength ◽  
Parametric Study ◽  
Design Method ◽  
Element Model ◽  
Structural System ◽  
Industrial Buildings ◽  
Stabilizing Effect ◽  
Stability Statistics

This paper deals with the stabilizing effect of girts and cladding on columns in light industrial buildings. The construction aspects of such systems are briefly reviewed and a description of their behavior is presented. Solutions available to determine column strength in column–girt–diaphragm systems are reviewed. The use of a finite-element-based software is proposed as the only practical way to analyze this type of structural system. Results of a large parametric study using a finite element model are presented and a method to evaluate the ultimate strength of actual columns is introduced. Finally, a simple hand design method is derived. Key words: diaphragm, design, finite element, girt, column, stability, statistics.

A Parametric Study for the Seismic Response Analysis of a Nuclear Reactor Building by Using a Three-Dimensional Finite Element Model

2016 ◽  
Author(s):  
Byunghyun Choi ◽  
Akemi Nishida ◽  
Norihiro Nakajima
Keyword(s):  
Finite Element ◽  
Research And Development ◽  
Finite Element Model ◽  
Seismic Response ◽  
Parametric Study ◽  
Three Dimensional ◽  
Element Model ◽  
Response Analysis ◽  
Seismic Response Analysis ◽  
Uncertainty Parameters

Research and development of three-dimensional vibration simulation technologies for nuclear facilities is one mission of the Center for Computational Science and e-Systems of the Japan Atomic Energy Agency (JAEA). A seismic intensity of upper 5 was observed in the area of High-Temperature Engineering Test Reactor (HTTR) at the Oarai Research and Development Center of JAEA during the 2011 Tohoku earthquake. In this paper, we report a seismic response analysis of this earthquake using three-dimensional models of the HTTR building. We performed a parametric study by using uncertainty parameters. Furthermore, we examined the variation in the response result for the uncertainty parameters to create a valid 3D finite element model.

Computer Modeling and Parametric Study of Thermal Effects in Integral Abutment Bridge

2012 ◽  
Vol 446-449 ◽  
pp. 733-738
Author(s):  
Mohammed Awad ◽  
Tian Lai Yu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Axial Force ◽  
Temperature Rise ◽  
Parametric Study ◽  
Element Model ◽  
Structural Behavior ◽  
Integral Abutment ◽  
Thermally Induced ◽  
Integral Abutment Bridge

Structural behavior of concrete integral abutment bridge subjected to temperature rise was investigated through a numerical modeling and parametric study. Long-term, field monitoring through the summer was performed on Industrial Park Bridge located in Heilongjiang province, China from June 13, 2010 until June 28, 2010. The collected data was used to validate the accuracy of a 3D-finite element model of the bridge which took into account soil-structure interaction. Based on the calibrated finite element model a parametric study considered two parameters, bridge length and abutment height, was carried out to investigate the effects of this parameters on structural behavior of integral abutment bridge subject to temperature rise. It was determined that Thermal load in the superstructure of the integral bridge develop significant magnitudes of bending and axial forces in the superstructure. The largest magnitude of thermally induced moment always occurs near the abutment, and axial force is constant across the length of each span. For bridge thermal expansion, longer bridges and taller abutments cause larger thermally induced superstructure axial force due to development of higher backfill pressure. Generally span length has a higher influence for thermally induced superstructure forces in terms of axial force and bending moment than the abutment height.

Individualized prediction of pedicle screw fixation strength with a finite element model

2020 ◽  
Vol 23 (4) ◽  
pp. 155-167
Author(s):  
Jonas Widmer ◽  
Marie-Rosa Fasser ◽  
Eleonora Croci ◽  
José Spirig ◽  
Jess G. Snedeker ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Pedicle Screw ◽  
Screw Fixation ◽  
Element Model ◽  
Pedicle Screw Fixation ◽  
Fixation Strength ◽  
Individualized Prediction

Development of an Advanced Finite Element Model and Parametric Study to Evaluate Cement Sheath Barrier

2019 ◽  
Vol 141 (9) ◽  
Author(s):  
Harshkumar Patel ◽  
Saeed Salehi
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Material Properties ◽  
Parametric Study ◽  
Element Model ◽  
Mechanical Stresses ◽  
Response Curves ◽  
Cement Material ◽  
Wellbore Pressure ◽  
Cement Sheath

Cement failure is known as one of the major causes for loss of well control events. Cement design is considered as one of the top technological knowledge gaps in high-pressure high-temperature oil and gas exploration. The primary objective of this paper is to perform a parametric analysis and identify critical parameters affecting the mechanical integrity of the set cement sheath. To achieve the objective, three-dimensional finite element models consisting of concentric casings and annular cement sheath were created. The finite element model was validated by analytical calculations. Performance of cement sheath was assessed by analyzing radial, hoop, and maximum shear stresses at different loading conditions. A parametric study was conducted by individually varying influencing factors such as cement material properties, sheath dimensions, and wellbore pressure loads. Values of all parameters were normalized and represented on the same plot against mechanical stresses. Such response curves can be used to estimate whether cement will structurally fail because of various operational loads or material aging. The plot can also be utilized to rank various factors in terms of influence on cement’s performance. Sensitivity response reveals that wellbore pressure, cement material properties, and annulus pressure are major parameters influencing mechanical stresses in neat class G cement. The order of importance depends on the type of stress. Results indicate interfacial bond failure and radial cracking to be the more likely modes of failure for class G cement. Cement response curves can help design engineers and regulators alike in quickly evaluating short-term or long-term fitness-for-service of cement sheath from the perspective of structural integrity. Industry standards and guidelines can be improved by adding performance curves for standard cement recipes.

Design and Installation of Buried Heated Pipelines at the Capixaba North Terminal Offshore Brazil

2004 ◽  
Author(s):  
Rafael Familiar Solano ◽  
Fa´bio Braga de Azevedo ◽  
Murilo Augusto Vaz ◽  
Carlos de Oliveira Cardoso
Keyword(s):  
Thermal Stability ◽  
Finite Element ◽  
Finite Element Model ◽  
Parametric Study ◽  
Feasible Solution ◽  
Element Model ◽  
Full Detail ◽  
Upheaval Buckling ◽  
Minimum Cover ◽  
Pipeline Design

The export pipelines of the Capixaba North Terminal (TNC) offshore Brazil will be operating with a great thermal stability potential due to the high temperatures that are necessary to assure an adequate flow. This paper focuses on the challenges for the design and installation group, due to the very strict maximum allowable imperfection (prop), in order to find a feasible solution for the installation process by a conventional lay barge. Also, the paper employs a finite element model and carries out a parametric study based on the soil coverage requirements and the maximum allowable imperfection originated from laying operations and pipeline burial process. The upheaval buckling will be studied in full detail in order to evaluate predefined curvatures, with the objective of finding the minimum cover height to limit the pipeline displacement and thus assuring its integrity. This work also aims to establish a numeric tool that will serve as basis for the upheaval buckling analysis in new pipeline design.

Investigation on the Behaviour of a Composite Floor Made of Cellular Beams in Fire Situation

2014 ◽  
Vol 5 (2) ◽  
pp. 175-188
Author(s):  
Gisèle Bihina ◽  
Bin Zhao ◽  
Abdelhamid Bouchaïr
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Parametric Study ◽  
Elevated Temperatures ◽  
Mechanical Load ◽  
Element Model ◽  
Resistance Rate ◽  
Natural Fire ◽  
In Fire ◽  
The Finite Element Model

The main results from a numerical investigation on a composite floor made of cellular beams at elevated temperatures are presented. From a full-scale natural fire test, a 3D finite element model has been developed under ANSYS code to simulate the thermo-mechanical behaviour of a composite floor with cellular beams. The calibration of this numerical model is based on the measured material properties and temperatures. A good correlation between the test and the numerical simulation is observed, in terms of temperatures, deformed shape and deflections. The finite element model is then used in a parametric study varying bay size, mechanical load and fire resistance rate. The results from this parametric study are compared to those from an analytical method, highlighting the conservativeness of the latter.

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