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A platform for research: civil engineering, architecture and urbanism
Effects of Structural and Aerodynamic Couplings on the Dynamic Response of Tall Twin Buildings with a Skybridge
Two types of coupling may emerge in wind-resistant designs of twin buildings connected by a skybridge. One is aerodynamic coupling due to a high level of cross-correlation between the wind loading components exerted on the buildings [Lim and Bienkiewicz, 2008a]. The other is structural coupling, introduced by the skybridge, synchronizing the motions of vibration of the buildings [Lim and Bienkiewicz, 2008b]. The coupling issues have stimulated wind tunnel studies utilizing an expanded high-frequency force balance (HFFB) technique, originally developed and utilized in laboratory investigations of single tall buildings. To date, only a limited number of efforts employing an enhanced HFFB approach have been published in open literature: [Xie and Irwin, 1998, 2001], [Boggs and Hosoya, 2000] and [Lim and Bienkiewicz, 2007]. Xie and Irwin [1998] developed a multi-HFFB system and proposed a generalized loading model formulated in the time domain. They combined the base wind loading, the nonlinear mode shapes, building eccentricity and an assumed wind pressure scheme. The proposed framework was applied in the estimation of the dynamic wind response of a generic twin-tower [Xie and Irwin, 2001]. Boggs and Hosoya [2000] studied a two-tower structure with coupled motions and they employed six (coupled) modes in the modal superposition analysis of the vibration of the buildings. Lim and Bienkiewicz [2007] developed a dual high-frequency force balance (DHFFB) system to measure the correlated wind loading which they subsequently used to predict the coupled building response. Of main interest in their study were the wind-induced rooftop accelerations of twin tall buildings with various aspect ratios. This paper is concerned with issues of the aerodynamic interference and structural coupling of two tall buildings connected by a skybridge. A refined HFFB approach to account for such couplings was employed. The base dynamic loading, measured using a DHFFB, was employed to calculate the rooftop accelerations. The aerodynamic coupling effects were evaluated by including and excluding the cross-correlations of the wind loading components. A parametric study of these effects was carried out for a range of the inter-building structural coupling and three representative mean return periods.
Effects of Structural and Aerodynamic Couplings on the Dynamic Response of Tall Twin Buildings with a Skybridge
Two types of coupling may emerge in wind-resistant designs of twin buildings connected by a skybridge. One is aerodynamic coupling due to a high level of cross-correlation between the wind loading components exerted on the buildings [Lim and Bienkiewicz, 2008a]. The other is structural coupling, introduced by the skybridge, synchronizing the motions of vibration of the buildings [Lim and Bienkiewicz, 2008b]. The coupling issues have stimulated wind tunnel studies utilizing an expanded high-frequency force balance (HFFB) technique, originally developed and utilized in laboratory investigations of single tall buildings. To date, only a limited number of efforts employing an enhanced HFFB approach have been published in open literature: [Xie and Irwin, 1998, 2001], [Boggs and Hosoya, 2000] and [Lim and Bienkiewicz, 2007]. Xie and Irwin [1998] developed a multi-HFFB system and proposed a generalized loading model formulated in the time domain. They combined the base wind loading, the nonlinear mode shapes, building eccentricity and an assumed wind pressure scheme. The proposed framework was applied in the estimation of the dynamic wind response of a generic twin-tower [Xie and Irwin, 2001]. Boggs and Hosoya [2000] studied a two-tower structure with coupled motions and they employed six (coupled) modes in the modal superposition analysis of the vibration of the buildings. Lim and Bienkiewicz [2007] developed a dual high-frequency force balance (DHFFB) system to measure the correlated wind loading which they subsequently used to predict the coupled building response. Of main interest in their study were the wind-induced rooftop accelerations of twin tall buildings with various aspect ratios. This paper is concerned with issues of the aerodynamic interference and structural coupling of two tall buildings connected by a skybridge. A refined HFFB approach to account for such couplings was employed. The base dynamic loading, measured using a DHFFB, was employed to calculate the rooftop accelerations. The aerodynamic coupling effects were evaluated by including and excluding the cross-correlations of the wind loading components. A parametric study of these effects was carried out for a range of the inter-building structural coupling and three representative mean return periods.
Effects of Structural and Aerodynamic Couplings on the Dynamic Response of Tall Twin Buildings with a Skybridge
Lim, Juntack (author) / Bienkiewicz, Bogusz (author)
Structures Congress 2009 ; 2009 ; Austin, Texas, United States
Structures Congress 2009 ; 1-9
2009-04-29
Conference paper
Electronic Resource
English
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