Documents disponibles écrits par cet auteur

Lumber-boxed concrete structural system—concept and preliminary analysis / Madhu M. Karthik in Journal of structural engineering, Vol. 137 N° 11 (Novembre 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 11 (Novembre 2011) . - pp. 1381-1389 Titre : Lumber-boxed concrete structural system—concept and preliminary analysis Type de document : texte imprimé Auteurs : Madhu M. Karthik, Auteur ; Mander, John B., Auteur ; David V. Rosowsky, Auteur Année de publication : 2012 Article en page(s) : pp. 1381-1389 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Timber  Concrete  Stress  strain  Stress  blocks  Moment  curvature Résumé : Lumber has the advantages of being a lightweight construction material, easy to handle, and environmentally benign. However, large creep deflections and significant issues with sound transmission, particularly the footfall problem, generally limit lumber use to small spans and low-rise buildings. A concrete topping on lumber subfloors may mitigate some of these issues, but even with well-engineered wood systems, the spans are relatively short. In this study, a new structural system is analytically explored. Called a lumber-boxed concrete structural system, the dual system utilizes the positive attributes of both dimensional lumber and reinforced concrete; composite action is not a requirement of the system. A stress-block approach is developed to calculate strength and deformation behavior. An analytical stress-block-based moment-curvature analysis is performed on the lumber-boxed concrete structural elements. Results show that the structural lumber-boxed concrete members may have better strength and ductility capacities when compared to an equivalent size ordinary reinforced concrete member. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i11/p1381_s1?isAuthorized=no [article] Lumber-boxed concrete structural system—concept and preliminary analysis [texte imprimé] / Madhu M. Karthik, Auteur ; Mander, John B., Auteur ; David V. Rosowsky, Auteur . - 2012 . - pp. 1381-1389. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 11 (Novembre 2011) . - pp. 1381-1389 Mots-clés : Timber  Concrete  Stress  strain  Stress  blocks  Moment  curvature Résumé : Lumber has the advantages of being a lightweight construction material, easy to handle, and environmentally benign. However, large creep deflections and significant issues with sound transmission, particularly the footfall problem, generally limit lumber use to small spans and low-rise buildings. A concrete topping on lumber subfloors may mitigate some of these issues, but even with well-engineered wood systems, the spans are relatively short. In this study, a new structural system is analytically explored. Called a lumber-boxed concrete structural system, the dual system utilizes the positive attributes of both dimensional lumber and reinforced concrete; composite action is not a requirement of the system. A stress-block approach is developed to calculate strength and deformation behavior. An analytical stress-block-based moment-curvature analysis is performed on the lumber-boxed concrete structural elements. Results show that the structural lumber-boxed concrete members may have better strength and ductility capacities when compared to an equivalent size ordinary reinforced concrete member. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i11/p1381_s1?isAuthorized=no

Performance-based procedure for direct displacement design of engineered wood-frame structures / Yue Wang in Journal of structural engineering, Vol. 136 N° 8 (Août 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 978-988 Titre : Performance-based procedure for direct displacement design of engineered wood-frame structures Type de document : texte imprimé Auteurs : Yue Wang, Auteur ; David V. Rosowsky, Auteur ; Weichiang Pang, Auteur Année de publication : 2011 Article en page(s) : pp. 978-988 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Direct  displacement  design  Performance-based  design  Seismic  design  Wood  shear  wall  Wood-frame  structures Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper reports on a study to extend a recently proposed direct displacement design (DDD) procedure for midrise engineered wood-frame structures and develop a set of factors for use in the procedure to meet specified performance levels with certain target probabilities. Representative index multistory building configurations were selected from the archetype buildings developed for the FEMA ATC-63. Seismic hazard levels and performance requirements recommended by ASCE 41-06 and modified for use in the National Science Foundation sponsored NEESWood project were used. The archetype buildings, originally designed using current force-based design procedures, were redesigned using the simplified DDD procedure (also described herein) with a range of nonexceedance (NE) probability adjustment factors (CNE). Specifically, the design interstory shear forces and the sheathing nail spacings were determined for each structure designed using CNE. Nonlinear time-history analysis was performed for each archetype structure under the 2%/50 year seismic hazard level and peak interstory drift distributions were developed. The NE probability at the 4% drift limit was then plotted against building height and design charts were developed for each different value of CNE. Given the building height and desired NE probability, engineers/designers can select the appropriate minimum value of CNE using these charts. Additional analyses could be performed to consider other hazard levels and performance requirements. Using design charts of this type, engineers/designers are able to specify a target drift limit as well as a target NE probability when using the simplified DDD procedure. Thus, a true performance-based procedure for the seismic design of midrise wood-frame structures is described. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p978_s1?isAuthorized=no [article] Performance-based procedure for direct displacement design of engineered wood-frame structures [texte imprimé] / Yue Wang, Auteur ; David V. Rosowsky, Auteur ; Weichiang Pang, Auteur . - 2011 . - pp. 978-988. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 978-988 Mots-clés : Direct  displacement  design  Performance-based  design  Seismic  design  Wood  shear  wall  Wood-frame  structures Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper reports on a study to extend a recently proposed direct displacement design (DDD) procedure for midrise engineered wood-frame structures and develop a set of factors for use in the procedure to meet specified performance levels with certain target probabilities. Representative index multistory building configurations were selected from the archetype buildings developed for the FEMA ATC-63. Seismic hazard levels and performance requirements recommended by ASCE 41-06 and modified for use in the National Science Foundation sponsored NEESWood project were used. The archetype buildings, originally designed using current force-based design procedures, were redesigned using the simplified DDD procedure (also described herein) with a range of nonexceedance (NE) probability adjustment factors (CNE). Specifically, the design interstory shear forces and the sheathing nail spacings were determined for each structure designed using CNE. Nonlinear time-history analysis was performed for each archetype structure under the 2%/50 year seismic hazard level and peak interstory drift distributions were developed. The NE probability at the 4% drift limit was then plotted against building height and design charts were developed for each different value of CNE. Given the building height and desired NE probability, engineers/designers can select the appropriate minimum value of CNE using these charts. Additional analyses could be performed to consider other hazard levels and performance requirements. Using design charts of this type, engineers/designers are able to specify a target drift limit as well as a target NE probability when using the simplified DDD procedure. Thus, a true performance-based procedure for the seismic design of midrise wood-frame structures is described. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p978_s1?isAuthorized=no

Simplified direct displacement design of six-story woodframe building and pretest seismic performance assessment / Weichiang Pang in Journal of structural engineering, Vol. 136 N° 7 (Juillet 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 813-825 Titre : Simplified direct displacement design of six-story woodframe building and pretest seismic performance assessment Type de document : texte imprimé Auteurs : Weichiang Pang, Auteur ; David V. Rosowsky, Auteur ; Shiling Pei, Auteur Année de publication : 2011 Article en page(s) : pp. 813-825 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Displacement-based  design  Wood  structures  Shear  walls  Earthquake  engineering  Seismic  hazard  Structural  engineering  Performance-based  design Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents a simplified direct displacement design (DDD) procedure which was used to design the shear walls for a six-story woodframe structure. The building was tested in the final phase of a Network for Earthquake Engineering Simulation (NEES) project. Specifically, NEESWood Capstone Building was designed to meet four performance expectations: damage limitation, life safety, far-field collapse prevention (CP), and near-fault CP. The performance expectations are defined in terms of combinations of interstory drift limits and prescribed seismic hazard levels associated with predefined nonexceedance probabilities. To verify that design requirements were met, a series of nonlinear time-history analyses (NLTHAs) was performed using suits of both far-field and near-fault ground motion records. The distributions of interstory drifts obtained from the NLTHA confirm that the Capstone Building designed using DDD meets all four target performance expectations, thereby validating the DDD procedure. Additionally, collapse analysis in accordance with the recently proposed Applied Technology Council project 63 (ATC-63) methodology was performed. The results of incremental dynamic analyses confirmed that the Capstone Building designed using the DDD procedure has adequate capacity margin against collapse, as dictated by the ATC-63 methodology. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i7/p813_s1?isAuthorized=no [article] Simplified direct displacement design of six-story woodframe building and pretest seismic performance assessment [texte imprimé] / Weichiang Pang, Auteur ; David V. Rosowsky, Auteur ; Shiling Pei, Auteur . - 2011 . - pp. 813-825. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 813-825 Mots-clés : Displacement-based  design  Wood  structures  Shear  walls  Earthquake  engineering  Seismic  hazard  Structural  engineering  Performance-based  design Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents a simplified direct displacement design (DDD) procedure which was used to design the shear walls for a six-story woodframe structure. The building was tested in the final phase of a Network for Earthquake Engineering Simulation (NEES) project. Specifically, NEESWood Capstone Building was designed to meet four performance expectations: damage limitation, life safety, far-field collapse prevention (CP), and near-fault CP. The performance expectations are defined in terms of combinations of interstory drift limits and prescribed seismic hazard levels associated with predefined nonexceedance probabilities. To verify that design requirements were met, a series of nonlinear time-history analyses (NLTHAs) was performed using suits of both far-field and near-fault ground motion records. The distributions of interstory drifts obtained from the NLTHA confirm that the Capstone Building designed using DDD meets all four target performance expectations, thereby validating the DDD procedure. Additionally, collapse analysis in accordance with the recently proposed Applied Technology Council project 63 (ATC-63) methodology was performed. The results of incremental dynamic analyses confirmed that the Capstone Building designed using the DDD procedure has adequate capacity margin against collapse, as dictated by the ATC-63 methodology. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i7/p813_s1?isAuthorized=no