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Predicting crosswind response of tall buildings: Base isolation and nonlinear aeroelastic effects
Abstract This study introduces an analysis framework to evaluate the crosswind response of tall buildings under the influence of base isolation and nonlinear aeroelastic effect near the vortex lock-in wind speed. The motion-induced and buffeting forces are determined based on those in a building with a fixed base. The primary focus is on modeling the motion-induced force in tall buildings with base isolation, where no pre-existing model exists. The fundamental modal displacement is used to describe the building motion relative to the base. The Bouc-Wen model is employed to capture the hysteresis in the relation of shear force and displacement of the isolation system. Through response history analysis, the response statistics of a 65-story building with a square cross-section are determined and compared with those of a fixed-base building. An investigation is conducted to examine the impact of different isolation layer parameters on building response. Additionally, this study explores how the motion-induced force model influences the building response. The findings indicate that base isolation effectively mitigates nonlinear aeroelastic effects, leading to a significant reduction in crosswind response.
Highlights This study presents an analysis framework for predicting crosswind response of base-isolated tall buildings at the vicinity of vortex lock-in speed where nonlinear negative aerodynamic damping is notable. The motion-induced wind force is modeled as proportional to the building vibration velocity and is developed using the force information of the fixed-base building. The upper building motion is represented by fundamental modal displacement. The shear force of the base isolation system is described by Bouc-Wen hysteresis model. The response of a 65-story tall building with a square cross-section is simulated and the response statistics are determined as functions of wind speed and structural damping ratio. A comprehensive parameter study is conducted to explore the influences of different base isolation parameters on building response. The influence of motion-induced force model is also discussed.
Predicting crosswind response of tall buildings: Base isolation and nonlinear aeroelastic effects
Abstract This study introduces an analysis framework to evaluate the crosswind response of tall buildings under the influence of base isolation and nonlinear aeroelastic effect near the vortex lock-in wind speed. The motion-induced and buffeting forces are determined based on those in a building with a fixed base. The primary focus is on modeling the motion-induced force in tall buildings with base isolation, where no pre-existing model exists. The fundamental modal displacement is used to describe the building motion relative to the base. The Bouc-Wen model is employed to capture the hysteresis in the relation of shear force and displacement of the isolation system. Through response history analysis, the response statistics of a 65-story building with a square cross-section are determined and compared with those of a fixed-base building. An investigation is conducted to examine the impact of different isolation layer parameters on building response. Additionally, this study explores how the motion-induced force model influences the building response. The findings indicate that base isolation effectively mitigates nonlinear aeroelastic effects, leading to a significant reduction in crosswind response.
Highlights This study presents an analysis framework for predicting crosswind response of base-isolated tall buildings at the vicinity of vortex lock-in speed where nonlinear negative aerodynamic damping is notable. The motion-induced wind force is modeled as proportional to the building vibration velocity and is developed using the force information of the fixed-base building. The upper building motion is represented by fundamental modal displacement. The shear force of the base isolation system is described by Bouc-Wen hysteresis model. The response of a 65-story tall building with a square cross-section is simulated and the response statistics are determined as functions of wind speed and structural damping ratio. A comprehensive parameter study is conducted to explore the influences of different base isolation parameters on building response. The influence of motion-induced force model is also discussed.
Predicting crosswind response of tall buildings: Base isolation and nonlinear aeroelastic effects
Huang, Guoqing (author) / Fan, Yuhang (author) / Chen, Xinzhong (author) / Yang, Xudong (author) / Li, Zhihao (author)
Engineering Structures ; 305
2024-02-19
Article (Journal)
Electronic Resource
English