Interference Effects on Windinduced Responses of Supertall Building Caused by Adjacent Buildings

Abstract:

The aeroelastic model experiment of Shanghai World Financial Center was carried out in TJ2 boundary layer wind tunnel. Then,a study was conducted on the interference effects of distant buildings with half the height of World Financial Center and the nearby Jin Mao Building with nearly the same height of World Financial Center on average and root mean square value of horizontal and rotational displacement, absolute maximum acceleration on the top of World Financial Center.The results show that, when the intensive highrise buildings (excluding Jin Mao Building) concentrate on the upstream or one side of World Financial Center, they have some influence on World Financial Center’s average response and root mean square value(RMS) response, especially the rotational response. When the intensive buildings concentrate on the downstream of World Financial Center, they have little influence on World Financial Center’s response. When Jin Mao Building locates in the upstream of World Financial Center, the average response of horizontal displacement of World Financial Center reduces due to wind block effects. However, the tail flow of Jin Mao Building causes the RMS horizontal displacement response of World Financial Center to increase. When the shielding effect causes uneven distribution of the average or fluctuating pressure at cardiac axis sides, it increases average or root mean square rotational displacement response. Different from previous studies, when Jin Mao Building locates in the downstream of World Financial Center, the frequency of vortex shedding of World Financial Center will change. Moreover, when the vortex shedding frequency is close to structural first natural frequency, it causes vortexinduced resonance phenomenon in direction of vibration of first natural frequency. When Jin Mao Building locates beside World Financial Center, it causes Narrow Road effect, which has some influences on average and RMS displacement response according to Narrow Road position and the pressure distribution.