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Steel Rack Connections: Identification of Most Influential Factors and a Comparison of Stiffness Design Methods.

Shah SN, Sulong NH, Shariati M, Jumaat MZ - PLoS ONE (2015)

Bottom Line: Four tests were repeatedly performed for each set to bring uniformity to the results taking the total number of tests to thirty-two.The moment-rotation (M-θ) behavior, load-strain relationship, major failure modes and the influence of selected parameters on connection performance were investigated.The equal area method provided more consistent values of stiffness and lowest variance in the data set as compared to the other two methods.

View Article: PubMed Central - PubMed

Affiliation: Department of Civil Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia.

ABSTRACT
Steel pallet rack (SPR) beam-to-column connections (BCCs) are largely responsible to avoid the sway failure of frames in the down-aisle direction. The overall geometry of beam end connectors commercially used in SPR BCCs is different and does not allow a generalized analytic approach for all types of beam end connectors; however, identifying the effects of the configuration, profile and sizes of the connection components could be the suitable approach for the practical design engineers in order to predict the generalized behavior of any SPR BCC. This paper describes the experimental behavior of SPR BCCs tested using a double cantilever test set-up. Eight sets of specimens were identified based on the variation in column thickness, beam depth and number of tabs in the beam end connector in order to investigate the most influential factors affecting the connection performance. Four tests were repeatedly performed for each set to bring uniformity to the results taking the total number of tests to thirty-two. The moment-rotation (M-θ) behavior, load-strain relationship, major failure modes and the influence of selected parameters on connection performance were investigated. A comparative study to calculate the connection stiffness was carried out using the initial stiffness method, the slope to half-ultimate moment method and the equal area method. In order to find out the more appropriate method, the mean stiffness of all the tested connections and the variance in values of mean stiffness according to all three methods were calculated. The calculation of connection stiffness by means of the initial stiffness method is considered to overestimate the values when compared to the other two methods. The equal area method provided more consistent values of stiffness and lowest variance in the data set as compared to the other two methods.

No MeSH data available.


Related in: MedlinePlus

Deformation of the beam end connector.
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pone.0139422.g008: Deformation of the beam end connector.

Mentions: There was a variety in the types of failure among all connections. Only the maximum deformations observed during experiments are illustrated here. Fig 6(A) and 6(B) shows the front and back views of connection after failure, respectively. The deformation of columns A and B is illustrated in Fig 7(A) and 7(B), respectively. The deformation of the beam the connector is shown in Fig 8. The deformation of tabs in connectors A and B is illustrated in Fig 9(A) and 9(B), respectively.


Steel Rack Connections: Identification of Most Influential Factors and a Comparison of Stiffness Design Methods.

Shah SN, Sulong NH, Shariati M, Jumaat MZ - PLoS ONE (2015)

Deformation of the beam end connector.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4599833&req=5

pone.0139422.g008: Deformation of the beam end connector.
Mentions: There was a variety in the types of failure among all connections. Only the maximum deformations observed during experiments are illustrated here. Fig 6(A) and 6(B) shows the front and back views of connection after failure, respectively. The deformation of columns A and B is illustrated in Fig 7(A) and 7(B), respectively. The deformation of the beam the connector is shown in Fig 8. The deformation of tabs in connectors A and B is illustrated in Fig 9(A) and 9(B), respectively.

Bottom Line: Four tests were repeatedly performed for each set to bring uniformity to the results taking the total number of tests to thirty-two.The moment-rotation (M-θ) behavior, load-strain relationship, major failure modes and the influence of selected parameters on connection performance were investigated.The equal area method provided more consistent values of stiffness and lowest variance in the data set as compared to the other two methods.

View Article: PubMed Central - PubMed

Affiliation: Department of Civil Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia.

ABSTRACT
Steel pallet rack (SPR) beam-to-column connections (BCCs) are largely responsible to avoid the sway failure of frames in the down-aisle direction. The overall geometry of beam end connectors commercially used in SPR BCCs is different and does not allow a generalized analytic approach for all types of beam end connectors; however, identifying the effects of the configuration, profile and sizes of the connection components could be the suitable approach for the practical design engineers in order to predict the generalized behavior of any SPR BCC. This paper describes the experimental behavior of SPR BCCs tested using a double cantilever test set-up. Eight sets of specimens were identified based on the variation in column thickness, beam depth and number of tabs in the beam end connector in order to investigate the most influential factors affecting the connection performance. Four tests were repeatedly performed for each set to bring uniformity to the results taking the total number of tests to thirty-two. The moment-rotation (M-θ) behavior, load-strain relationship, major failure modes and the influence of selected parameters on connection performance were investigated. A comparative study to calculate the connection stiffness was carried out using the initial stiffness method, the slope to half-ultimate moment method and the equal area method. In order to find out the more appropriate method, the mean stiffness of all the tested connections and the variance in values of mean stiffness according to all three methods were calculated. The calculation of connection stiffness by means of the initial stiffness method is considered to overestimate the values when compared to the other two methods. The equal area method provided more consistent values of stiffness and lowest variance in the data set as compared to the other two methods.

No MeSH data available.


Related in: MedlinePlus