Finite Element Modeling of Bolted Cold-Formed Steel Storage Rack Upright Frames

2016 ◽  
Vol 846 ◽  
pp. 251-257
Author(s):  
Nima Talebian ◽  
Benoit P. Gilbert ◽  
Nadia Baldassino ◽  
Hong Guan
Keyword(s):  
Finite Element ◽  
Experimental Test ◽  
Transverse Shear ◽  
Shear Stiffness ◽  
Fe Model ◽  
Test Results ◽  
Shell Elements ◽  
Building Enclosure ◽  
Earthquake Design ◽  
Cold Formed Steel

Steel storage racks, commonly assembled from cold-formed steel profiles, are braced in the cross-aisle direction, where bracing members are typically bolted between two uprights forming an “upright frame”. Especially for high-bay racks and racks supporting the building enclosure, accurately determining the transverse shear stiffness of upright frames is essential in calculating the elastic buckling load, performing earthquake design and serviceability checks. International racking specifications recommend different approaches to evaluate the said transverse shear stiffness. The Rack Manufacturers Institute (RMI) Specification conservatively uses an analytical solution based on Timoshenko and Gere's theory while the European (EN15512) and Australian (AS4084) Specifications recommend testing to be conducted. Previous studies have shown that Finite Element Analyses (FEA), solely using beam elements, fail to reproduce experimental test results and may overestimate the transverse shear stiffness by a factor up to 25. This discrepancy is likely attributed to the local deformations occurring at the bolted joints. In this paper, a commercially used upright frame configuration has been modeled using shell elements in FEA and the response is verified against published experimental test results. A good correlation is found between the FEA and test results, concluding that shell elements are able to fully capture the behaviour of the upright frame. Future studies on the use of the FE model are also presented.

scholarly journals Feasibility Verification of Mountable PZT-Interface for Impedance Monitoring in Tendon-Anchorage

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Thanh-Canh Huynh ◽  
Young-Hwan Park ◽  
Jae-Hyung Park ◽  
Jeong-Tae Kim
Keyword(s):  
Finite Element ◽  
Experimental Test ◽  
Structural Model ◽  
Fine Tuning ◽  
Equivalent Model ◽  
Fe Model ◽  
Classification Methods ◽  
Test Results ◽  
Electromechanical Impedance ◽  
Impedance Monitoring

This study has been motivated to numerically evaluate the performance of the mountable PZT-interface for impedance monitoring in tendon-anchorage. Firstly, electromechanical impedance monitoring and feature classification methods are outlined. Secondly, a structural model of tendon-anchorage subsystem with mountable PZT-interface is designed for impedance monitoring. Finally, the feasibility of the mountable PZT-interface is numerically examined. A finite element (FE) model is designed for the lab-scaled tendon-anchorage. The FE model of the PZT-interface is tuned as its impedance signatures meet the experimental test results at the same frequency ranges and also with identical patterns. Equivalent model properties of the FE model corresponding to prestress forces inflicted on the lab-tested structure are identified from the fine-tuning practice.

scholarly journals Applicability of a Three-Layer Model for the Dynamic Analysis of Ballasted Railway Tracks

Vibration ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 151-174
Author(s):  
André F. S. Rodrigues ◽  
Zuzana Dimitrovová
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Dynamic Analysis ◽  
Shear Stiffness ◽  
Shear Resistance ◽  
Railway Track ◽  
Fe Model ◽  
Inertial Effects ◽  
Layer Model ◽  
3D Finite Element

In this paper, the three-layer model of ballasted railway track with discrete supports is analyzed to access its applicability. The model is referred as the discrete support model and abbreviated by DSM. For calibration, a 3D finite element (FE) model is created and validated by experiments. Formulas available in the literature are analyzed and new formulas for identifying parameters of the DSM are derived and validated over the range of typical track properties. These formulas are determined by fitting the results of the DSM to the 3D FE model using metaheuristic optimization. In addition, the range of applicability of the DSM is established. The new formulas are presented as a simple computational engineering tool, allowing one to calculate all the data needed for the DSM by adopting the geometrical and basic mechanical properties of the track. It is demonstrated that the currently available formulas have to be adapted to include inertial effects of the dynamically activated part of the foundation and that the contribution of the shear stiffness, being determined by ballast and foundation properties, is essential. Based on this conclusion, all similar models that neglect the shear resistance of the model and inertial properties of the foundation are unable to reproduce the deflection shape of the rail in a general way.

scholarly journals Experiment and Design Method on Cold-Formed Thin-Walled Steel Lipped Channel Columns with Slotted Web Holes Under Axial Compression

2017 ◽  
Vol 11 (1) ◽  
pp. 244-257 ◽  
Author(s):  
Xingyou Yao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Ultimate Strength ◽  
Test Results ◽  
Distortional Buckling ◽  
Steel Columns ◽  
Cold Formed Steel ◽  
Thin Walled ◽  
Shell Finite Element ◽  
The Web

Background: Cold-formed steel structural sections used in the walls of residential buildings and agricultural facilities are commonly C-shaped sections with web holes. These holes located in the web of sections can alter the elastic stiffness and the ultimate strength of a structural member. The objective of this paper is to study the buckling mode and load-carrying capacity of cold-formed thin-walled steel column with slotted web holes. Methods: Compression tests were conducted on 26 intermediate length columns with and without holes. The tested compressive members included four different kinds of holes. For each specimen, a shell finite element Eigen-buckling analysis and nonlinear analysis were also conducted. The influence of the slotted web hole on local and distortional buckling response had also been studied. The comparison on ultimate strength between test results and calculated results using Chinese cold-formed steel specification GB50018-2002, North American cold-formed steel specification AISI S100-2016, and nonlinear Finite Element method was made. Result: Test results showed that the distortional buckling occurred for intermediate columns with slotted holes and the ultimate strength of columns with holes was less than that of columns without holes. The ultimate strength of columns decreased with the increase in transverse width of hole in the cross-section of member. The Finite element analysis results showed that the web holes could influence on the elastic buckling stress of columns. The shell finite element could be used to model the buckling modes and analysis the ultimate strength of members with slotted web holes. The calculated ultimate strength shows that results predicted with AISI S100-2016 and analyzed using finite element method are close to test results. The calculated results using Chinese code are higher than the test results because Chinese code has no provision to calculate the ultimate strength of members with slotted web holes. Conclusion: The calculated method for cold-formed thin-walled steel columns with slotted web holes are proposed based on effective width method in Chinese code. The results calculated using the proposed method show good agreement with test results and can be used in engineering design for some specific cold-formed steel columns with slotted web holes studied in this paper.

scholarly journals Design and Structural Analysis of a Rack System for Using in Agriculture

2018 ◽  
Vol 66 (3) ◽  
pp. 641-646
Author(s):  
Miroslav Blatnický ◽  
Ján Dižo ◽  
Dalibor Barta
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Structural Analysis ◽  
Fe Model ◽  
Steel Tubes ◽  
Shell Elements ◽  
Human Power ◽  
Construction Design ◽  
Pull Out ◽  
Pressure Pipeline

The paper deals with a construction design and structural analysis of the rack system which will be used for storage of steel tubes of pressure pipeline for fodder mixtures transportation in agricultural company. Structure of the designed equipment is made by the welding of steel parts and consists of the main framework and four pull-out racks on both sides. Racks move by means of human power through a rotating crank. Every individual pull-out racks is able to carries pipes of various dimensions, both length and diameter with total weight up to 3 tons with respect to customer requests. Since it is a prototype’s structure, we have designed main dimensions of it, material and technology for production and performed also structural analyses as the integral part of every engineering design. Structural analyses were conducted by means of numeric procedure known as finite element method. With respect to the used steel profiles shell elements were used for FE model. Analyses were performed for maximal loading cases in order to identify the level of safety in the most exposed locations of the structure.

scholarly journals Factors contributing to the transverse shear stiffness of bolted cold-formed steel storage rack upright frames with channel bracing members

2019 ◽  
Vol 136 ◽  
pp. 50-63 ◽  
Author(s):  
Nima Talebian ◽  
Benoit P. Gilbert ◽  
Nadia Baldassino ◽  
Hassan Karampour
Keyword(s):  
Transverse Shear ◽  
Shear Stiffness ◽  
Cold Formed Steel

scholarly journals Bearing Capacity of Circular Footing on Sand Deposit

2015 ◽  
Vol 773-774 ◽  
pp. 1518-1523 ◽  
Author(s):  
Aminaton Marto ◽  
Mohsen Oghabi ◽  
Nor Zurairahetty Mohd Yunus
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Experimental Test ◽  
Static Load ◽  
Sandy Soils ◽  
Soil Parameters ◽  
Test Results ◽  
Finite Element Software ◽  
Sand Deposit ◽  
Circular Footing

Bearing capacity and settlement are two important parameters in geotechnical engineering. The bearing capacity of circular foundations on sandy soils is important to geotechnical practicing engineers. Design of foundations includes soil parameters and bearing capacity of foundation. This paper presents the results of laboratory experimental model tests of circular footings supported on sand deposit under static load. The finite element software Abaqus is used to compare the results. The effects of the relative density of the sand (30%, 50%, and 70%) and the diameter of circular footing (75 mm and 100 mm) are investigated. It can be concluded that the experimental test results fit quite well with the results of numerical method.

The Modeling Study on Kinematic Interface Joints Based on Accordant Displacement Method

2010 ◽  
Vol 29-32 ◽  
pp. 48-53
Author(s):  
Xue Qian Chen ◽  
Qiang Du ◽  
Xiao Juan Chen
Keyword(s):  
Finite Element ◽  
Solid State Laser ◽  
Fe Analysis ◽  
Ambient Vibration ◽  
Fe Model ◽  
Mean Square ◽  
Test Results ◽  
Contact Form ◽  
Displacement Method ◽  
Reflector System

The kinematic interface joints are widely used in reflector systems of the high-power solid-state laser facilities. In order to get better finite element(FE) analysis results of reflector systems, it is important to model the joints exactly. The accordant displacement method is used for modeling the joints according to the contact form of joints. The FE model of the reflector system is built subjected to the assuming, the modal analysis and the ambient vibration calculations are carried out. The computing results of inherent frequencies, measure points’ root mean square(RMS) displacements and the transfer characteristics of four kinematic interface positions are accordant with that of the test results. The compared results show that the method modeling the kinematic interface joints is feasible in the paper.

FE Modeling of EB-FRP Strengthened RC Beams

2014 ◽  
Vol 1065-1069 ◽  
pp. 1147-1150
Author(s):  
Kang Liu
Keyword(s):  
Finite Element ◽  
Fe Model ◽  
Rc Beams ◽  
Fe Modeling ◽  
Test Results ◽  
Structural System ◽  
Externally Bonded ◽  
Insight Into

A finite element (FE) model for externally bonded FRP (EB-FRP) strengthened RC beams is developed to simulate the responses of the structural system, to gain a better insight into the mechanism of the system. Comparisons between the predictions of the model and test results are presented to demonstrate its capability and accuracy.

DYNAMIC RESPONSE OF METALLIC SANDWICH PANELS UNDER BLAST LOADINGS

2012 ◽  
Vol 12 (03) ◽  
pp. 1250017 ◽  
Author(s):  
HONGXIN WANG ◽  
XIAOXIONG ZHA ◽  
JIANQIAO YE
Keyword(s):  
Finite Element ◽  
Energy Balance ◽  
Dynamic Response ◽  
Analytical Method ◽  
Sandwich Panels ◽  
Fe Model ◽  
Test Results ◽  
Fluid Structure Interactions ◽  
Parametric Studies ◽  
Blast Loadings

An energy-balance-based analytical method and finite element (FE) simulations were developed in this paper to study the dynamic response of metallic sandwich panels subject to blast loadings. The analytical model can be used to predict approximately the deflection of the panels, while the FE model can take into account fluid–structure interactions and the effect of strain rate. Both models were validated by comparing their predictions with the test results available in the literature. Parametric studies were then carried out to assess various factors that are influential in characterizing the dynamic behavior of sandwich panels subject to blast loads.

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