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Détail de l'auteur
Auteur Chia-Ming Uang
Documents disponibles écrits par cet auteur
Affiner la rechercheCyclic testing and modeling of cold-formed steel special bolted moment frame connections / Chia-Ming Uang in Journal of structural engineering, Vol. 136 N° 8 (Août 2010)
[article]
in Journal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 953-960
Titre : Cyclic testing and modeling of cold-formed steel special bolted moment frame connections Type de document : texte imprimé Auteurs : Chia-Ming Uang, Auteur ; Atsushi Sato, Auteur ; Jong-Kook Hong, Auteur Année de publication : 2011 Article en page(s) : pp. 953-960 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cyclic tests Steel frames Cold-formed steel Slip Bearings Bolted connections Buckling Mathematical models Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A cyclic testing of nine full-scale beam-to-column moment connection subassemblies was carried out to support the development of design provisions for a lateral load-resisting system in the AISI S110: Standard for Seismic Design of Cold-Formed Steel Structural Systems—Special Bolted Moment Frames. This type of one-story framing system features C-section beams connected to hollow structural section columns by bearing-type high-strength bolts and is commonly used in industrial platform construction. The test results showed that these specimens had an interstory drift capacity significantly larger than 0.04 rad. The cyclic behavior was characterized by a linear response, a slip range, and a significant hardening response due to bearing at bolt holes. The conventional strong column-weak beam design philosophy is not appropriate for this system. The inelastic action through the bolt slip and bearing in the connection is a ductile yielding mechanism. Beams and columns should be protected to remain elastic by the capacity design principles. Based on the concept of the instantaneous center of rotation of an eccentrically loaded bolt group, a model that can properly simulate the cyclic behavior of the bolted moment connection is presented.
DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p953_s1?isAuthorized=no [article] Cyclic testing and modeling of cold-formed steel special bolted moment frame connections [texte imprimé] / Chia-Ming Uang, Auteur ; Atsushi Sato, Auteur ; Jong-Kook Hong, Auteur . - 2011 . - pp. 953-960.
Génie Civil
Langues : Anglais (eng)
in Journal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 953-960
Mots-clés : Cyclic tests Steel frames Cold-formed steel Slip Bearings Bolted connections Buckling Mathematical models Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A cyclic testing of nine full-scale beam-to-column moment connection subassemblies was carried out to support the development of design provisions for a lateral load-resisting system in the AISI S110: Standard for Seismic Design of Cold-Formed Steel Structural Systems—Special Bolted Moment Frames. This type of one-story framing system features C-section beams connected to hollow structural section columns by bearing-type high-strength bolts and is commonly used in industrial platform construction. The test results showed that these specimens had an interstory drift capacity significantly larger than 0.04 rad. The cyclic behavior was characterized by a linear response, a slip range, and a significant hardening response due to bearing at bolt holes. The conventional strong column-weak beam design philosophy is not appropriate for this system. The inelastic action through the bolt slip and bearing in the connection is a ductile yielding mechanism. Beams and columns should be protected to remain elastic by the capacity design principles. Based on the concept of the instantaneous center of rotation of an eccentrically loaded bolt group, a model that can properly simulate the cyclic behavior of the bolted moment connection is presented.
DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p953_s1?isAuthorized=no Seismic performance factors for cold-formed steel special bolted moment frames / Atsushi Sato in Journal of structural engineering, Vol. 136 N° 8 (Août 2010)
[article]
in Journal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 961-967
Titre : Seismic performance factors for cold-formed steel special bolted moment frames Type de document : texte imprimé Auteurs : Atsushi Sato, Auteur ; Chia-Ming Uang, Auteur Année de publication : 2011 Article en page(s) : pp. 961-967 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Steel frames Cold-formed steel Bolted moment connection Seismic performance factors Response modification coefficient Deflection amplification factor System overstrength factor Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The American Iron and Steel Institute (AISI) recently issued a standard on the seismic design of cold-formed steel special bolted moment frames (SBMF). It is expected that ductility is provided through bolt slippage and bearing in the moment connection region; both the beams and columns are to be designed based on the capacity design principles. This paper provides background information for the proposed seismic performance factors. Based on cyclic testing results, a value of 3.5 was proposed for the response modification coefficient, R. A statistical evaluation through nonlinear time-history analysis, which considered the unique structural characteristics of this framing system, showed that the Newmark-Hall ductility reduction rule is conservative. Based on the analysis results, a revised rule was proposed, which resulted in a deflection amplification factor, Cd, of R/1.2( ≈ 3.0). A design procedure in the AISI seismic standard allows the designer to directly calculate the maximum seismic force in the moment connection at the design story drift level, thereby an empirical system overstrength factor, Ω0, is unnecessary for the design of SBMFs.
DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p961_s1?isAuthorized=no [article] Seismic performance factors for cold-formed steel special bolted moment frames [texte imprimé] / Atsushi Sato, Auteur ; Chia-Ming Uang, Auteur . - 2011 . - pp. 961-967.
Génie Civil
Langues : Anglais (eng)
in Journal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 961-967
Mots-clés : Steel frames Cold-formed steel Bolted moment connection Seismic performance factors Response modification coefficient Deflection amplification factor System overstrength factor Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The American Iron and Steel Institute (AISI) recently issued a standard on the seismic design of cold-formed steel special bolted moment frames (SBMF). It is expected that ductility is provided through bolt slippage and bearing in the moment connection region; both the beams and columns are to be designed based on the capacity design principles. This paper provides background information for the proposed seismic performance factors. Based on cyclic testing results, a value of 3.5 was proposed for the response modification coefficient, R. A statistical evaluation through nonlinear time-history analysis, which considered the unique structural characteristics of this framing system, showed that the Newmark-Hall ductility reduction rule is conservative. Based on the analysis results, a revised rule was proposed, which resulted in a deflection amplification factor, Cd, of R/1.2( ≈ 3.0). A design procedure in the AISI seismic standard allows the designer to directly calculate the maximum seismic force in the moment connection at the design story drift level, thereby an empirical system overstrength factor, Ω0, is unnecessary for the design of SBMFs.
DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p961_s1?isAuthorized=no Shake table testing of a utility - scale wind turbine / Ian Prowell in Journal of engineering mechanics, Vol. 138 N° 7 (Juillet 2012)
[article]
in Journal of engineering mechanics > Vol. 138 N° 7 (Juillet 2012) . - pp.900–909.
Titre : Shake table testing of a utility - scale wind turbine Type de document : texte imprimé Auteurs : Ian Prowell, Auteur ; Chia-Ming Uang, Auteur ; Ahmed Elgamal, Auteur Année de publication : 2012 Article en page(s) : pp.900–909. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Renewable energy Green energy Earthquake Seismic Shake table Wind turbine Résumé : Shake table tests were undertaken on a full-scale wind turbine (65-kW rated power, 22.6-m hub height, and 16-m rotor diameter) using the Network for Earthquake Engineering Simulation Large High Performance Outdoor Shake Table at the University of California, San Diego. Structural response characteristics and modal parameters are presented for base shaking imparted in two configurations, both parallel (configuration 1) and perpendicular (configuration 2) to the axis of rotation of the rotor. Results are summarized for a series of progressively stronger motions imparted in configuration 1, with analysis identifying damage sources leading to an overall loss in stiffness. Two sources of observed softening are identified and quantified: (1) degradation of grout at the tower base, and (2) loss of bolt torque at the connections between tower segments. Results showed that the two configurations had little difference in structural response and demand parameters. For the tested turbine, with appropriate consideration of boundary conditions and modal characteristics, linear theory for a single degree-of-freedom system can explain most of the observed dynamics. Although not significant for the tested turbine, it was observed that higher mode behavior may be important for large turbines. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000391 [article] Shake table testing of a utility - scale wind turbine [texte imprimé] / Ian Prowell, Auteur ; Chia-Ming Uang, Auteur ; Ahmed Elgamal, Auteur . - 2012 . - pp.900–909.
Mécanique appliquée
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 138 N° 7 (Juillet 2012) . - pp.900–909.
Mots-clés : Renewable energy Green energy Earthquake Seismic Shake table Wind turbine Résumé : Shake table tests were undertaken on a full-scale wind turbine (65-kW rated power, 22.6-m hub height, and 16-m rotor diameter) using the Network for Earthquake Engineering Simulation Large High Performance Outdoor Shake Table at the University of California, San Diego. Structural response characteristics and modal parameters are presented for base shaking imparted in two configurations, both parallel (configuration 1) and perpendicular (configuration 2) to the axis of rotation of the rotor. Results are summarized for a series of progressively stronger motions imparted in configuration 1, with analysis identifying damage sources leading to an overall loss in stiffness. Two sources of observed softening are identified and quantified: (1) degradation of grout at the tower base, and (2) loss of bolt torque at the connections between tower segments. Results showed that the two configurations had little difference in structural response and demand parameters. For the tested turbine, with appropriate consideration of boundary conditions and modal characteristics, linear theory for a single degree-of-freedom system can explain most of the observed dynamics. Although not significant for the tested turbine, it was observed that higher mode behavior may be important for large turbines. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000391 Welded sleeve connection design of cantilevered steel sign structures / Hyoung-Bo Sim in Journal of structural engineering, Vol. 137 N° 11 (Novembre 2011)
[article]
in Journal of structural engineering > Vol. 137 N° 11 (Novembre 2011) . - pp. 1303-1310
Titre : Welded sleeve connection design of cantilevered steel sign structures Type de document : texte imprimé Auteurs : Hyoung-Bo Sim, Auteur ; Chia-Ming Uang, Auteur Année de publication : 2012 Article en page(s) : pp. 1303-1310 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Signs Steel pipes Fatigue Welds Finite-element analysis Résumé : Cantilevered steel sign structures are widely used for on-premises freestanding signs. A welded sleeve connection detail is commonly used to splice pipes of different diameters. This type of structure can be flexible and the connections are vulnerable to fatigue cracking attributable to wind-induced vibration. Fatigue has not been considered in design, although the connection has an inherently low fatigue resistance. To investigate the cause of failure at the sleeve connection and to mitigate the problem, a study of 10 sample failure cases and a series of finite-element analyses were performed. The finite-element analyses showed that the actual load-transfer mechanism in the sleeve connection was not very consistent with that assumed in design. In addition, very high-stress concentration caused the weld-toe crack to propagate into the pipe section. The common practice of strengthening the connection by welded gusset plates did not alleviate the problem. A frequency analysis indicated that the second-mode resonance because of wind-induced vortex shedding may cause a large number of damage cycles. Two alternative connection details were proposed to mitigate weld cracking. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i11/p1303_s1?isAuthorized=no [article] Welded sleeve connection design of cantilevered steel sign structures [texte imprimé] / Hyoung-Bo Sim, Auteur ; Chia-Ming Uang, Auteur . - 2012 . - pp. 1303-1310.
Génie Civil
Langues : Anglais (eng)
in Journal of structural engineering > Vol. 137 N° 11 (Novembre 2011) . - pp. 1303-1310
Mots-clés : Signs Steel pipes Fatigue Welds Finite-element analysis Résumé : Cantilevered steel sign structures are widely used for on-premises freestanding signs. A welded sleeve connection detail is commonly used to splice pipes of different diameters. This type of structure can be flexible and the connections are vulnerable to fatigue cracking attributable to wind-induced vibration. Fatigue has not been considered in design, although the connection has an inherently low fatigue resistance. To investigate the cause of failure at the sleeve connection and to mitigate the problem, a study of 10 sample failure cases and a series of finite-element analyses were performed. The finite-element analyses showed that the actual load-transfer mechanism in the sleeve connection was not very consistent with that assumed in design. In addition, very high-stress concentration caused the weld-toe crack to propagate into the pipe section. The common practice of strengthening the connection by welded gusset plates did not alleviate the problem. A frequency analysis indicated that the second-mode resonance because of wind-induced vortex shedding may cause a large number of damage cycles. Two alternative connection details were proposed to mitigate weld cracking. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i11/p1303_s1?isAuthorized=no