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Closure to “LRFD factors for pultruded wide-flange columns”by Linda M. Vanevenhoven, Carol K. Shield, and Lawrence C. Bank / Linda M. Vanevenhoven in Journal of structural engineering, Vol. 138 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 5 (Mai 2012) . - pp.659–660. Titre : Closure to “LRFD factors for pultruded wide-flange columns”by Linda M. Vanevenhoven, Carol K. Shield, and Lawrence C. Bank Type de document : texte imprimé Auteurs : Linda M. Vanevenhoven, Auteur ; Carol K. Shield, Auteur Année de publication : 2012 Article en page(s) : pp.659–660. Note générale : Génie civil Langues : Anglais (eng) ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000524 [article] Closure to “LRFD factors for pultruded wide-flange columns”by Linda M. Vanevenhoven, Carol K. Shield, and Lawrence C. Bank [texte imprimé] / Linda M. Vanevenhoven, Auteur ; Carol K. Shield, Auteur . - 2012 . - pp.659–660. Génie civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 5 (Mai 2012) . - pp.659–660. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000524

LRFD factors for pultruded wide-flange columns / Linda M. Vanevenhoven in Journal of structural engineering, Vol. 136 N° 5 (Mai 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 5 (Mai 2010) . - pp. 554-564 Titre : LRFD factors for pultruded wide-flange columns Type de document : texte imprimé Auteurs : Linda M. Vanevenhoven, Auteur ; Carol K. Shield, Auteur ; Lawrence C. Bank, Auteur Année de publication : 2011 Article en page(s) : pp. 554-564 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Columns  Resistance  factors  Reliability  Local  buckling  Global  buckling  Wide  flange  profiles  Pultrusion Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Fiber-reinforced polymer (FRP) pultruded profiles are produced by a number of manufacturers worldwide in similar, but nonstandard, wide-flange, I, angle, and tubular profiles. At present there is no American National Standards Institute approved design code in the United States for structural design with pultruded FRP profiles. Manufacturers of pultruded profiles each provide their own design equations, design methods, material properties, and safety factors for their pultruded products. There is a need for standardization of production and design of pultruded profiles to enable mainstream use of these profiles in structural engineering practice. The purpose of this paper is twofold: (1) to provide appropriate resistance factors (ϕ factors) for wide-flange pultruded columns that are compatible with ASCE 7 load factors and (2) to provide a unified analytical equation for local and global buckling of concentrically loaded axial members, which may be appropriate for a future design code. The resistance factors are provided for different target levels of structural reliability, β, and for different nominal design properties of the pultruded materials. The resistance factors were determined using Monte Carlo simulation based on the results of 75 tests of full-scale pultruded columns that have been reported in the literature. In addition, resistance factors and structural reliabilities were calculated for the design equations provided by the manufactures in their design codes. The paper demonstrates that a unified design equation for pultruded columns can be developed for LRFD with reliability indices that are similar to those used for conventional materials. The paper also shows that markedly different reliability indices are obtained for the different manufacturer-provided equations even though identical allowable stress design safety factors are recommended by all manufacturers. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i5/p554_s1?isAuthorized=no [article] LRFD factors for pultruded wide-flange columns [texte imprimé] / Linda M. Vanevenhoven, Auteur ; Carol K. Shield, Auteur ; Lawrence C. Bank, Auteur . - 2011 . - pp. 554-564. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 5 (Mai 2010) . - pp. 554-564 Mots-clés : Columns  Resistance  factors  Reliability  Local  buckling  Global  buckling  Wide  flange  profiles  Pultrusion Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Fiber-reinforced polymer (FRP) pultruded profiles are produced by a number of manufacturers worldwide in similar, but nonstandard, wide-flange, I, angle, and tubular profiles. At present there is no American National Standards Institute approved design code in the United States for structural design with pultruded FRP profiles. Manufacturers of pultruded profiles each provide their own design equations, design methods, material properties, and safety factors for their pultruded products. There is a need for standardization of production and design of pultruded profiles to enable mainstream use of these profiles in structural engineering practice. The purpose of this paper is twofold: (1) to provide appropriate resistance factors (ϕ factors) for wide-flange pultruded columns that are compatible with ASCE 7 load factors and (2) to provide a unified analytical equation for local and global buckling of concentrically loaded axial members, which may be appropriate for a future design code. The resistance factors are provided for different target levels of structural reliability, β, and for different nominal design properties of the pultruded materials. The resistance factors were determined using Monte Carlo simulation based on the results of 75 tests of full-scale pultruded columns that have been reported in the literature. In addition, resistance factors and structural reliabilities were calculated for the design equations provided by the manufactures in their design codes. The paper demonstrates that a unified design equation for pultruded columns can be developed for LRFD with reliability indices that are similar to those used for conventional materials. The paper also shows that markedly different reliability indices are obtained for the different manufacturer-provided equations even though identical allowable stress design safety factors are recommended by all manufacturers. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i5/p554_s1?isAuthorized=no

Shear strength and drift capacity of fiber-reinforced concrete slab-column connections subjected to biaxial displacements / Min-Yuan Cheng in Journal of structural engineering, Vol. 136 N° 9 (Septembre 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 9 (Septembre 2010) . - pp. 1078-1088 Titre : Shear strength and drift capacity of fiber-reinforced concrete slab-column connections subjected to biaxial displacements Type de document : texte imprimé Auteurs : Min-Yuan Cheng, Auteur ; Gustavo J. Parra-Montesinos, Auteur ; Carol K. Shield, Auteur Année de publication : 2011 Article en page(s) : pp. 1078-1088 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Punching  shear  Drift  Ductility  Shear  studs  Flat  plate  Steel  fibers Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Results from the tests of three large-scale slab-column subassemblies subjected to combined gravity load and biaxial lateral displacements are presented. The main purpose of the experimental program was to investigate the use of randomly oriented steel fiber reinforcement as a means to increase connection punching shear strength and deformation capacity. The connection of Specimen SB1 was reinforced with regular strength (1,100 MPa) fibers, 30 mm long and 0.55 mm in diameter, while the connection of Specimen SB2 featured high-strength (2,300 MPa) fibers, 30 mm long and 0.38 mm in diameter. Both types of fibers were targeted at a 1.5% volume fraction. The connection of Specimen SB3, on the other hand, was reinforced with shear studs, designed according to the 2008 American Concrete Institute Building Code. All three connections were subjected to a gravity shear ratio of approximately 1/2 during application of biaxial lateral displacements. The use of fiber reinforcement in the connection region resulted in superior deformation capacity compared to the connection with shear stud reinforcement. Average connection rotation, just before punching, was approximately 0.04 rad in the two fiber-reinforced concrete connections. On the other hand, shear stud reinforcement seems to have had little effect on connection ductility. The connection with shear stud reinforcement failed at an average rotation of 0.023 rad. Inspection of this connection after the test indicated a breakout failure of the concrete engaged by the second line of studs accompanied by severe bending of the bottom steel rail. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i9/p1078_s1?isAuthorized=no [article] Shear strength and drift capacity of fiber-reinforced concrete slab-column connections subjected to biaxial displacements [texte imprimé] / Min-Yuan Cheng, Auteur ; Gustavo J. Parra-Montesinos, Auteur ; Carol K. Shield, Auteur . - 2011 . - pp. 1078-1088. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 9 (Septembre 2010) . - pp. 1078-1088 Mots-clés : Punching  shear  Drift  Ductility  Shear  studs  Flat  plate  Steel  fibers Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Results from the tests of three large-scale slab-column subassemblies subjected to combined gravity load and biaxial lateral displacements are presented. The main purpose of the experimental program was to investigate the use of randomly oriented steel fiber reinforcement as a means to increase connection punching shear strength and deformation capacity. The connection of Specimen SB1 was reinforced with regular strength (1,100 MPa) fibers, 30 mm long and 0.55 mm in diameter, while the connection of Specimen SB2 featured high-strength (2,300 MPa) fibers, 30 mm long and 0.38 mm in diameter. Both types of fibers were targeted at a 1.5% volume fraction. The connection of Specimen SB3, on the other hand, was reinforced with shear studs, designed according to the 2008 American Concrete Institute Building Code. All three connections were subjected to a gravity shear ratio of approximately 1/2 during application of biaxial lateral displacements. The use of fiber reinforcement in the connection region resulted in superior deformation capacity compared to the connection with shear stud reinforcement. Average connection rotation, just before punching, was approximately 0.04 rad in the two fiber-reinforced concrete connections. On the other hand, shear stud reinforcement seems to have had little effect on connection ductility. The connection with shear stud reinforcement failed at an average rotation of 0.023 rad. Inspection of this connection after the test indicated a breakout failure of the concrete engaged by the second line of studs accompanied by severe bending of the bottom steel rail. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i9/p1078_s1?isAuthorized=no