1 Effects of Wind-Induced Tall Building Vibrations on Human Motor Performance Kwok-Shing Wong 1 , Chui Luen Vera Hau 2 Kenny C.S. Kwok 1 and Ravindra S. Gonetilleke 3 1 Institute for Infrastructure Engineering, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751. 17364557@student.uws.edu.au 2 CLP Power Wind/Wave Tunnel Facility, The Hong Kong University of Science and Technology. 3 Department of Industrial Engineering and Logistics Management, The Hong Kong University of Science and Technology Abstract Prolonged exposure to wind-induced vibrations in tall buildings can cause discomfort, impair task performance, and even trigger motion sickness symptoms. To evaluate the influence of wind-induced vibrations on human motor performance, a dual-axis tall building motion simulator that simulated sinusoidal vibrations while participants performed a Fitts’ Law type of task was used. Participants experienced a static condition, and motion conditions with acceleration levels of 8 and 30 milli-g, at frequencies of 0.125, 0.25 and 0.5 Hz, in fore-aft and lateral postural orientations. The results showed that increases in frequency, and particularly, magnitude of acceleration level leads to measureable performance degradation. 1 Introduction Building owners strive to design and construct buildings that reach new heights while minimizing the construction cost. These tall buildings often adopt slender shapes, which possess low natural frequencies of vibration and inherently low structural damping values, and thus increases their sensitivity to wind excitations. During strong wind events, these wind-sensitive buildings are prone to wind-induced vibrations that are generally predicted and assessed against occupant comfort criteria such as ISO/FDIS 10137:2007(E). Prolonged exposure to these vibrations can cause discomfort, impair physical and cognitive task performance, and trigger motion sickness symptoms, particularly for motion sickness prone individuals. The goal of this project is to evaluate the impact of wind-induced tall building vibrations on human motor performance. A versatile and transportable dual-axis tall building motion simulator was designed and built to study occupant comfort, physical and cognitive task performance in wind-excited tall buildings. The Fitts’ Law tapping task was used to measure task performance under static and motion conditions including fore-aft and lateral movements. 2 Motion simulator 2.1 Specifications, design and calibration A dual-axis tall building motion simulator was designed and built at the Hong Kong University of Science and Technology (HKUST). The test platform houses a 4 m x 3 m test room and is