Documents disponibles écrits par cet auteur

Evaluation of racking performance of wood portal frames with different wall configurations and construction details / Chun Ni in Journal of structural engineering, Vol. 138 N° 8 (Août 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 8 (Août 2012) . - pp.984–994. Titre : Evaluation of racking performance of wood portal frames with different wall configurations and construction details Type de document : texte imprimé Auteurs : Chun Ni, Auteur ; Minjuan He, Auteur ; Songlai Chen, Auteur Année de publication : 2012 Article en page(s) : pp.984–994. Note générale : Génie civil Langues : Anglais (eng) Mots-clés : Racking  performance  Portal  frame  wall  Finite  element  model Résumé : The performance of portal frame walls was studied using a finite-element model verified with results from tests of full-size portal frame walls. Parameters such as wall height, metal strap type and location, doubling of the bottom plate, sheathing placement, and nailing pattern were investigated. Results indicate that in all cases, lateral load capacity and stiffness are greatly reduced with the increase of wall height. Considering the effect of different metal strap types and locations, the tensile strength of metal straps has the greatest impact on the lateral load capacity and stiffness. Walls with metal straps placed directly on the framing members outperform walls with metal straps placed over the sheathing. For walls with a double bottom plate and two rows of nails fastening the bottom plate, the stiffness and lateral load capacity are slightly increased compared with walls with a single bottom plate. For walls with unblocked sheathing at midheight, the lateral load capacity is the same as in walls with continuous sheathing running from the bottom of the wall to the top, but the stiffness is slightly less. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000537 [article] Evaluation of racking performance of wood portal frames with different wall configurations and construction details [texte imprimé] / Chun Ni, Auteur ; Minjuan He, Auteur ; Songlai Chen, Auteur . - 2012 . - pp.984–994. Génie civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 8 (Août 2012) . - pp.984–994. Mots-clés : Racking  performance  Portal  frame  wall  Finite  element  model Résumé : The performance of portal frame walls was studied using a finite-element model verified with results from tests of full-size portal frame walls. Parameters such as wall height, metal strap type and location, doubling of the bottom plate, sheathing placement, and nailing pattern were investigated. Results indicate that in all cases, lateral load capacity and stiffness are greatly reduced with the increase of wall height. Considering the effect of different metal strap types and locations, the tensile strength of metal straps has the greatest impact on the lateral load capacity and stiffness. Walls with metal straps placed directly on the framing members outperform walls with metal straps placed over the sheathing. For walls with a double bottom plate and two rows of nails fastening the bottom plate, the stiffness and lateral load capacity are slightly increased compared with walls with a single bottom plate. For walls with unblocked sheathing at midheight, the lateral load capacity is the same as in walls with continuous sheathing running from the bottom of the wall to the top, but the stiffness is slightly less. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000537

Midply truss wall system / Jung-Pyo Hong in Journal of structural engineering, Vol. 138 N° 9 (Septembre 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 9 (Septembre 2012) . - pp.1120–1127. Titre : Midply truss wall system : High-performance shear wall for midrise wood-frame buildings Type de document : texte imprimé Auteurs : Jung-Pyo Hong, Auteur ; Chun Ni, Auteur ; Matt Vinson, Auteur Année de publication : 2012 Article en page(s) : pp.1120–1127. Note générale : Génie civil Langues : Anglais (eng) Mots-clés : Shear  walls  Wood  structures  Experimental  studies  Cyclic  tests  Wood  trusses  Conceptual  design  Connections Résumé : A high-performance wood-frame shear wall system, named the MIDPLY truss wall (MTW), was developed for application to midrise wood-frame buildings. The basic MTW system consists of metal-plate–connected wood trusses, sheathing panels, and steel tie-downs. The sheathing panels of the MTW system are placed between the wood trusses and connected with mechanical fasteners. The main concept of the MTW system is to increase the lateral load resistance of a shear wall by reconfiguring the wall frame members into lateral load–resisting wood trusses. In this study, the feasibility of the MTW system was investigated. Eight 2,440×2,440 mm MTW walls were constructed and tested under monotonic and cyclic loading in accordance with ASTM test standards. Shear stiffness, strength properties, and ductility of the MTW walls were evaluated and compared with those of comparable MIDPLY walls. Overall, the MTW system shows significant improvements in shear stiffness, yield load, peak load, and ductility. This paper contains a discussion of the failure modes, the effect of the vertical load, the importance of truss design, and the further studies needed. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000536 [article] Midply truss wall system : High-performance shear wall for midrise wood-frame buildings [texte imprimé] / Jung-Pyo Hong, Auteur ; Chun Ni, Auteur ; Matt Vinson, Auteur . - 2012 . - pp.1120–1127. Génie civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 9 (Septembre 2012) . - pp.1120–1127. Mots-clés : Shear  walls  Wood  structures  Experimental  studies  Cyclic  tests  Wood  trusses  Conceptual  design  Connections Résumé : A high-performance wood-frame shear wall system, named the MIDPLY truss wall (MTW), was developed for application to midrise wood-frame buildings. The basic MTW system consists of metal-plate–connected wood trusses, sheathing panels, and steel tie-downs. The sheathing panels of the MTW system are placed between the wood trusses and connected with mechanical fasteners. The main concept of the MTW system is to increase the lateral load resistance of a shear wall by reconfiguring the wall frame members into lateral load–resisting wood trusses. In this study, the feasibility of the MTW system was investigated. Eight 2,440×2,440 mm MTW walls were constructed and tested under monotonic and cyclic loading in accordance with ASTM test standards. Shear stiffness, strength properties, and ductility of the MTW walls were evaluated and compared with those of comparable MIDPLY walls. Overall, the MTW system shows significant improvements in shear stiffness, yield load, peak load, and ductility. This paper contains a discussion of the failure modes, the effect of the vertical load, the importance of truss design, and the further studies needed. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000536