Application of Reliability Based Design and Assessment to Seismic Evaluations

2010 ◽  
Author(s):  
Maher Nessim ◽  
Nader Yoosef-Ghodsi ◽  
Doug Honegger ◽  
Joe Zhou ◽  
Shanshan Wang
Keyword(s):  
Finite Element ◽  
Probability Distribution ◽  
Natural Gas ◽  
Finite Element Model ◽  
Element Model ◽  
Soil Liquefaction ◽  
Simplified Approach ◽  
Natural Gas Pipelines ◽  
Reliability Based Design ◽  
Ground Deformations

The application of reliability based design and assessment (RBDA) as a basis for seismic evaluations of natural gas pipelines is explored through analysis of a number of representative pipeline examples. To accomplish this, a simplified approach was developed to generate a representative probability distribution of permanent ground deformations due to soil liquefaction. An idealized pipeline alignment through a liquefiable layer under a river was defined, and a number of cases representing NPS12 and NPS36 pipelines in classes 1, 2 and 3 were analyzed using a finite element model. The probability of exceeding the strain limits for pipe body and girth weld were calculated and compared to the reliability targets. The results were used to identify diameter and class combinations that can meet the reliability targets, and to make preliminary conclusions regarding the viability of using RBDA for seismic evaluations.

scholarly journals Finite element model calibration of multi-story buildings through interferometric imaging and spectral ratio method

2016 ◽  
Vol 43 (4) ◽  
pp. 320-325 ◽  
Author(s):  
Yavuz Kaya
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Spectral Ratio ◽  
Element Model ◽  
Ratio Method ◽  
Interferometric Imaging ◽  
Simplified Approach ◽  
Amplitude Spectra ◽  
Finite Element Model Calibration ◽  
Sr Method

To identify and calibrate the finite element model for multi-story buildings, a simplifıed approach is being introduced in this paper; this methodology is based on interferometric imaging and encompasses spectral ratio (SR) method. Interferometric imaging provides a new set of seismic data free of coupling between structures to its subsurface and independent of the excitation of the building. The SR method, on the other hand, is the ratio of Fourier amplitude spectra of the roof-deconvolved records on two adjacent stories. The newly introduced methodology enables each story to be identified uniquely for its stiffness since the SR of a particular story is dependent only on the properties of itself and the stories above.

The Application of Multi-Node Cable Element

2012 ◽  
Vol 430-432 ◽  
pp. 1498-1501
Author(s):  
Xiao Yu Sun ◽  
Zhen Qing Wang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Longitudinal Mode ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Temperature Dependent ◽  
Simplified Approach ◽  
Linear Finite Element ◽  
Nonlinear Finite Element Model ◽  
Inertia Forces

A non-linear finite element model of inclined cables, cables with non-leveled supports, in the large displacement and deformation fields is proposed for computing the dynamic response to wind loads which blow in arbitrary direction. The temperature-dependent elastoplastic behaviors of cables were taken into account in the nonlinear finite element model. This model was used for an extensive looping factor parameter study.A parametric super element model for cable passing through multiple pulleys is presented in this study for the static analysis of structures. The proposed formulation,which accounts for longitudinal inertia forces, allows to spot the circumstances when the simplified approach, adopting longitudinal mode condensation, becomes too crude.

Finite Element Simulation of Tire-Rim Interface

1989 ◽  
Vol 17 (4) ◽  
pp. 305-325 ◽  
Author(s):  
N. T. Tseng ◽  
R. G. Pelle ◽  
J. P. Chang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Finite Element Simulation ◽  
Contact Pressure ◽  
Element Model ◽  
Experimental Measurements ◽  
Inflation Pressure ◽  
Interference Fit ◽  
Element Simulation ◽  
Rubber Composite

Abstract A finite element model was developed to simulate the tire-rim interface. Elastomers were modeled by nonlinear incompressible elements, whereas plies were simulated by cord-rubber composite elements. Gap elements were used to simulate the opening between tire and rim at zero inflation pressure. This opening closed when the inflation pressure was increased gradually. The predicted distribution of contact pressure at the tire-rim interface agreed very well with the available experimental measurements. Several variations of the tire-rim interference fit were analyzed.

Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

1996 ◽  
Vol 24 (4) ◽  
pp. 339-348 ◽  
Author(s):  
R. M. V. Pidaparti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Rubber Belt ◽  
Steel Cord ◽  
Torsional Analysis

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

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