scholarly journals Equivalent static force method for selective storage racks with uplifting baseplates

2020 ◽  
Vol 165 ◽  
pp. 105821 ◽  
Author(s):  
James R. Maguire ◽  
Lip H. Teh ◽  
G. Charles Clifton ◽  
Timothy J. McCarthy
Keyword(s):  
Static Force ◽  
Force Method ◽  
Selective Storage ◽  
Storage Racks

Dynamic analysis of buildings for earthquake-resistant design

2003 ◽  
Vol 30 (2) ◽  
pp. 338-359 ◽  
Author(s):  
Murat Saatcioglu ◽  
JagMohan Humar
Keyword(s):  
Dynamic Analysis ◽  
Seismic Design ◽  
Earthquake Engineering ◽  
Response Spectrum ◽  
Time History ◽  
Building Code ◽  
Static Force ◽  
Force Method ◽  
Inelastic Analysis ◽  
Hysteretic Response

The proposed 2005 edition of the National Building Code of Canada specifies dynamic analysis as the preferred method for computing seismic design forces and deflections, while maintaining the equivalent static force method for areas of low seismicity and for buildings with certain height limitations. Dynamic analysis procedures are categorized as either linear (elastic) dynamic analysis, consisting of the elastic modal response spectrum method or the numerical integration linear time history method, or nonlinear (inelastic) response history analysis. While both linear and nonlinear analyses require careful analytical modelling, the latter requires additional considerations for proper simulation of hysteretic response and necessitates a special study that involves detailed review of design and supporting analyses by an independent team of engineers. The paper provides an overview of dynamic analysis procedures for use in seismic design, with discussions on mathematical modelling of structures, structural elements, and hysteretic response. A discussion of the determination of structural period to be used in association with the equivalent static force method is presented.Key words: dynamic analysis, earthquake engineering, elastic analysis, fundamental period, hysteretic modelling, inelastic analysis, National Building Code of Canada, seismic design, structural analysis, structural design.

Cross-aisle seismic performance of selective storage racks

2020 ◽  
Vol 168 ◽  
pp. 105999 ◽  
Author(s):  
James R. Maguire ◽  
Lip H. Teh ◽  
G. Charles Clifton ◽  
Z.H. Tang ◽  
James B.P. Lim
Keyword(s):  
Seismic Performance ◽  
Selective Storage ◽  
Storage Racks

scholarly journals Assessment of the Seismic Behavior of Selective Storage Racks Subjected to Chilean Earthquakes

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 855 ◽  
Author(s):  
Eduardo Nuñez ◽  
Catalina Aguayo ◽  
Ricardo Herrera
Keyword(s):  
Numerical Models ◽  
Time History ◽  
Reduction Factor ◽  
Elastic Behavior ◽  
Inelastic Behavior ◽  
Base Shear ◽  
Aspect Ratios ◽  
The Cross ◽  
Selective Storage ◽  
Storage Racks

A seismic performance evaluation of selective storage racks subjected to Chilean Earthquakes was conducted using nonlinear pushover and nonlinear dynamic time-history analyses. Nine seismic records with two horizontal components and magnitude Mw > 7.7 were applied to numerical models of prototype rack structures. The prototype racks were designed considering two types of soil and two aspect ratios. The inelastic behavior of beam connections was included in the models. The results showed a predominantly elastic behavior, mainly in the cross-aisle direction, in comparison to the down-aisle direction. The inelastic action was concentrated in pallet beams and up-rigths. Higher values of base shear were reached, due to elevated rigidity in rack configurations, and an acceptable performance was obtained. A response reduction factor was reported in both directions, reaching values larger than the limit imposed by the Chilean standard. However, values below this limit were obtained in the cross-aisle direction, in some cases. Finally, in all cases, the calculated response modification factor is highly influenced by the overstrength obtained from seismic design.

scholarly journals Application of Hyperelastic Nodal Force Method to Evaluation of Aortic Valve Cusps Coaptation: Thin Shell vs. Membrane Formulations

Mathematics ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 1450
Author(s):  
Yuri Vassilevski ◽  
Alexey Liogky ◽  
Victoria Salamatova
Keyword(s):  
Aortic Valve ◽  
Finite Elements ◽  
Shell Model ◽  
Thin Shell ◽  
Aortic Valves ◽  
Shear Moduli ◽  
Force Method ◽  
Elastic Potentials ◽  
Shell Analysis ◽  
First Time

Coaptation characteristics are crucial in an assessment of the competence of reconstructed aortic valves. Shell or membrane formulations can be used to model the valve cusps coaptation. In this paper we compare both formulations in terms of their coaptation characteristics for the first time. Our numerical thin shell model is based on a combination of the hyperelastic nodal forces method and the rotation-free finite elements. The shell model is verified on several popular benchmarks for thin-shell analysis. The relative error with respect to reference solutions does not exceed 1–2%. We apply our numerical shell and membrane formulations to model the closure of an idealized aortic valve varying hyperelasticity models and their shear moduli. The coaptation characteristics become almost insensitive to elastic potentials and sensitive to bending stiffness, which reduces the coaptation zone.

Geometry optimization of acetonitrile monomer and dimers using CNDO/force method

1986 ◽  
Vol 96 (3-4) ◽  
pp. 285-290 ◽  
Author(s):  
R Brakaspathy ◽  
Surjit Singh
Keyword(s):  
Geometry Optimization ◽  
Force Method

reduction of equilibrium, compatibility and flexibility matrices, in the force method

1992 ◽  
Vol 35 (6) ◽  
pp. 1219-1236 ◽  
Author(s):  
S. Pellegrino ◽  
A. S. K. Kwan ◽  
T. F. Van Heerden
Keyword(s):  
Force Method

Weak-Link Analysis of Motor-Operated Butterfly Valve

2002 ◽  
Author(s):  
Donghae Kim
Keyword(s):  
Structural Integrity ◽  
Weak Link ◽  
Link Analysis ◽  
Seismic Load ◽  
Seismic Loads ◽  
Static Force ◽  
Bending Stress ◽  
Butterfly Valve ◽  
Load Path ◽  
Valve Assembly

The purpose of this paper is to address the structural integrity of the motor operated butterfly valve assembly by providing the methodology and equations to quantitatively determine the permissible component load in the load path from the operator to the valve. The weak link analysis is to determine the maximum allowable torque on the butterfly valve by equating the stresses caused by the torque and seismic load with the appropriate allowable stress value, and then the unknown torque is solved. Analysis methods are based on classical static force balancing equations and on classical axial, shear, and bending stress equations using the worst possible load combinations including seismic loads resulting from design basis earthquake.

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