Numerical Investigation on Structural Behaviour and Curling Influence of Aluminum Alloy Bolted Connections

2012 ◽  
Vol 166-169 ◽  
pp. 885-889 ◽  
Author(s):  
Tae Soo Kim ◽  
Yong Hyun Jo ◽  
Yun Cheol Choi
Keyword(s):  
Test Results ◽  
Strain Development ◽  
Bolted Connections ◽  
Structural Behaviour ◽  
Element Analysis ◽  
Edge Distance ◽  
End Distance ◽  
Parametric Studies ◽  
Structural Behaviors ◽  
Test Result

Numerical simulation is utilized to estimate the structural behaviors such as ultimate strength, fracture mode and curling effect of single shear bolted connections fabricated with aluminum alloys. In the Kim’s previous research, the validity of finite element analysis was verified through the comparison of test results and analysis results. In this paper, curling deformation and strain development between test result and analysis result were investigated. Also, additional parametric studies are performed for bolted connections with other variables of edge distance and end distance, which are not considered in the existing experiment. The conditions of end distance and edge distance for curing occurrence were discussed.

An Experimental Study on Ultimate Behaviors of Double Shear Bolted Connections with Ferritic Stainless Steel

2013 ◽  
Vol 664 ◽  
pp. 976-979
Author(s):  
Tae Soo Kim ◽  
Min Seung Kim
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Test Results ◽  
Bolted Connections ◽  
Bolted Connection ◽  
Double Shear ◽  
Loading Direction ◽  
Constant Dimension ◽  
End Distance ◽  
Bolt Diameter

Based on the existing test results of single shear bolted connection fabricated with cold-formed ferritic stainless steel, in this study, the experiment for double shear bolted connections with bolt arrangements(1×2, 2×2) and end distance parallel to the loading direction as main variables has been performed. Specimens were planed with a constant dimension of edge distance perpendicular to the loading direction, bolt diameter, pitch and gauge. Ultimate strength and fracture mode obtained from test results were compared with those predicted by current American and Japan design codes such as AISI and AIJ.

Ultimate Behavior of Single Shear Bolted Connections with Thin-Walled Aluminum Alloys(6061-T6)

2012 ◽  
Vol 446-449 ◽  
pp. 3441-3445 ◽  
Author(s):  
Tae Soo Kim ◽  
Yong Hyun Jo ◽  
Seung Hun Kim ◽  
Yong Taeg Lee
Keyword(s):  
Finite Element ◽  
Ultimate Strength ◽  
Plane Deformation ◽  
Free Edge ◽  
Fe Analysis ◽  
Test Results ◽  
Bolted Connections ◽  
Element Analysis ◽  
Out Of Plane ◽  
Single Shear

The purpose of this study is to investigate the ultimate behaviors of aluminum alloy bolted connections assembled with four bolts. Specimens for single shear bolted connections were tested and finite element analysis based on this test results was conducted. The validity of finite element(FE) analysis for predicting the structural behaviors such as ultimate strength, fracture mode and curling(out-of-plane deformation) occurrence was verified through the comparisons between test results and FE analysis results. It is known that the curling resulted in sudden strength drop. Moreover, FE models with free edge and restrained out-of-plane deformation for curled specimens are analyzed additionally, therefore, the influence of curling on the ultimate strength; strength reduction ratio is estimated.

Block Shear Behaviors of Angle Two-Bolted Connections with Austenitic Stainless Steel – Experiment and Finite Element Analysis

2013 ◽  
Vol 658 ◽  
pp. 350-353
Author(s):  
Tae Soo Kim ◽  
Min Seung Kim ◽  
Sung Woo Shin
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Ultimate Strength ◽  
Strength Reduction ◽  
Test Results ◽  
Bolted Connections ◽  
Element Analysis ◽  
Block Shear

Since stainless steel has significant characteristics such as its superior corrosion resistance, durability, aesthetic appeal etc., it has been utilized as structural members in buildings. Recently, ultimate behaviors and curling influence in austenitic stainless steel single shear bolted connections with thin-walled plane plates have been investigated by T.S. Kim. In this paper, finite element analysis (FEA) has been conducted based on the existing test results of angle bolted connections in fabricated with austenitic stainless steel. The validation of the numerical analysis prediction was verified through the comparison of test results for fracture mode, ultimate strength and curling occurrence. Curling (out-of- plane deformation) also observed in the connections with a long end distance. The curling caused the ultimate strength reduction and the ultimate strength reduction ratios (varied from 12% to 25%) caused by curling have been estimated quantitatively through the comparison of FEA results of FE models with free edge and restrained curling.

Bearing Performance and Design Method of Aluminum Alloy Bolted Connections

2011 ◽  
Vol 71-78 ◽  
pp. 882-889 ◽  
Author(s):  
Yuan Qing Wang ◽  
Huan Xin Yuan ◽  
Yong Jiu Shi ◽  
Gui Xiang Zhang
Keyword(s):  
Aluminum Alloy ◽  
Design Method ◽  
Sheet Thickness ◽  
Test Results ◽  
Bolted Connections ◽  
Bolted Connection ◽  
End Distance ◽  
Screw Diameter ◽  
Primary Form ◽  
Good Agreement

Served as the primary form of joints in aluminum structures, the bolted connection is of great necessity to be investigated. The bearing performance of aluminum alloy bolted connections was evaluated by test and finite element (FE) analysis. A total of 20 bolted connections were tested and the varying parameters incorporated screw diameter and end distance. The test results included the ultimate bearing capacities and relationship between applied load and bolt hole deformation. Numerical simulation for the test process was implemented; thereupon reliability and accuracy of the FE models could be validated by good agreement with test results. By virtue of the verified numerical model, elaborated analysis of principle variables including inner and outer plies, end distance, screw diameter, sheet thickness and so on was carried out. Compared to the current overly conservative design rules, a new design method that could make full use of the bearing capacity was proposed. The corresponding design value of bearing strength was also presented with reference to the recommended constructional provisions.

A Numerical Study on Block Shear Strength of Channel Four-Bolted Connections Fabricated with Austenitic Stainless Steel

2013 ◽  
Vol 680 ◽  
pp. 247-251 ◽  
Author(s):  
Tae Soo Kim ◽  
Min Seong Kim ◽  
Seung Hun Kim ◽  
Yong Taeg Lee
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Ultimate Strength ◽  
Numerical Study ◽  
Plane Deformation ◽  
Strength Reduction ◽  
Bolted Connections ◽  
Element Analysis ◽  
Block Shear ◽  
Structural Behaviors

Stainless steel has been utilized on structural members of building due to significant characteristics in its superior corrosion resistance, durability, aesthetic appeal etc. Recently, structural behaviors and curling effect in single shear bolted connection fabricated with thin-walled plane plates have been studied by T.S. Kim. In this paper, finite element analysis (FEA) has been conducted based on the existing test result of channel bolted connections in austenitic stainless steel. The validation of numerical approach was verified to predict the structural behaviors such as fracture mode, ultimate strength and curling occurrence of bolted connections. Curling (out-of- plane deformation) also occurred in the connections with a long end distance like bolted connections assembled with plane plates. The curling caused the ultimate strength reduction and ultimate strength reduction caused by curling has been estimated quantitatively through the comparison of FEA results of FE models with free edge and restrained curling. Additional parametric analysis for FE models with extended variables has been performed. Therefore, the ultimate strengths were compared with current design strengths and reasonable strength formulae for connections with no curling effect were proposed.

Parametric Analysis for Ultimate Strength Prediction of Stainless Steel Bolted Joints with Single Bolt

2011 ◽  
Vol 255-260 ◽  
pp. 79-83
Author(s):  
Tae Soo Kim ◽  
Jin Seong Lim
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Ultimate Strength ◽  
Mesh Size ◽  
Bolted Joints ◽  
Test Results ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Parametric Studies ◽  
Single Shear

A variety of parametric studies utilizing the finite element analysis (FEA) have been performed by Kim et al in order to predict the mechanical behavior(ultimate strength) of single shear bolted joints in cold-formed(thin-walled) stainless steel. The precedent researches have been conducted with respect to the mechanical behaviors of single shear bolted joints fabricated with four bolts and two bolts. Subsequently, this study has been focused on the comparison of ultimate behaviors between the existing test results and FEA results. In addition, parametric study has been performed in order to investigate the influence of mesh size and washer existence on ultimate behaviors. Therefore, reasonable finite element modelling method and condition were recommended in this paper.

Finite Element Analysis on Structural Behaviours of Single Shear Cold-Formed Stainless Steel Bolted Connections with Two Bolts

2010 ◽  
Vol 452-453 ◽  
pp. 613-616 ◽  
Author(s):  
Yong Taeg Lee ◽  
Tae Soo Kim ◽  
Jin Seong Lim ◽  
Seung Hun Kim
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stainless Steel ◽  
Ultimate Strength ◽  
Plane Deformation ◽  
Plate Thickness ◽  
Bolted Connections ◽  
Element Analysis ◽  
End Distance ◽  
Single Shear

The experimental research for single shear bolted connection of cold-formed stainless steel fabricated with two bolts (2×1 bolt arrangement) has been conducted by T.S. Kim etc. Plate thickness and end distance parallel to the direction of loading was considered as main variables. It is found that the curling occurred easily in bolted connections with a long end distance and thinner plate. In this paper, finite element analysis study has been performed in order to compare test results with the predicted results and to investigate in detail the ultimate strength and curling influence. Finite element analysis(FEA) procedures also were introduced. FE models of connections with restrained out of plane deformation were also simulated for comparison with the curled models. Therefore, the validation of FEA in predicting ultimate strength and curling behavior was verified and the strength reduction ratio caused by curling was estimated.

Flexural Behavior of Void RC and PC Slab with Polystyrene Forms

2010 ◽  
Vol 452-453 ◽  
pp. 61-64 ◽  
Author(s):  
Seung Hun Kim
Keyword(s):  
Precast Concrete ◽  
The Self ◽  
Flexural Behavior ◽  
Displacement Curve ◽  
Test Results ◽  
Analysis Model ◽  
Element Analysis ◽  
Floor System ◽  
Structural Behaviors

Where the self weight of the overall RC(Reinforced Concrete) or PC(Precast Concrete) floor system needs to be considered, the quantity of in-situ concrete required can be reduced by the application of polystyrene void forms to slab. In this study, flexural behaviors of void RC and PC slab with polystyrene form were evaluated to understand the effect on the self weight reduction of the slab. This paper presents experimental works and finite element analysis on the bending of the void slabs. Six specimens were tested. The main parameters of experiments were the slab types (RC and PC), the types and arrangement details of polystyrene form, and the thickness of slab. Structural behaviors of void slabs were evaluated on the basis of failure mode, load-displacement curve, and ultimate strengths. Test results indicated that nominal strengths by ACI code agreed well with experimental results. The results of analysis were compared with the results of test for estimating the validity of analysis model.

Item Context and /s/ Phone Articulation Test Results

1972 ◽  
Vol 15 (4) ◽  
pp. 852-860 ◽  
Author(s):  
Zoe Zehel ◽  
Ralph L. Shelton ◽  
William B. Arndt ◽  
Virginia Wright ◽  
Mary Elbert
Keyword(s):  
Test Score ◽  
Sound Production ◽  
Broad Context ◽  
Test Results ◽  
Production Task ◽  
Test Result

Fourteen children who misarticulated some phones of the /s/ phoneme were tape recorded articulating several lists of items involving /s/. The lists included the Mc-Donald Deep Test for /s/, three lists similar to McDonald’s but altered in broad context, and an /s/ sound production task. Scores from lists were correlated, compared for differences in means, or both. Item sets determined by immediate context were also compared for differences between means. All lists were found to be significantly correlated. The comparison of means indicated that both broad and immediate context were related to test result. The estimated “omega square” statistic was used to evaluate the percentage of test score variance attributable to context.

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