Wind Effects And Wind Induced Vibration Control Of High-Rise Buildings

Based on the wind tunnel tests the influence of polygon high-rise building's concave convex corner on the wind load shape coefficients distribution was studied. The distribution characteristics of mean wind pressure shape coefficients and extreme wind pressure shape coefficients of seven representative polygon sections with different concave convex corners were discussed and compared with both the standard crisscross section and the CAARC mode. According to the analysis of wind pressure sensitive position of seven cross-sections, the best section for wind-resistant was also presented. It is shown that:The upwind right-cutting angle's shape coefficients are inconsistent with the standard crisscross; The incoming flow's separation points of four sections, including crisscross, deep, shallow serrated square and shallow serrated square cross-section with a groove are different; Groove makes the shape coefficients of cutting angle and middle area uniform by mitigating the separation of flow in the cutting angle; By comparing these four cross-sections, the shallow serrated square cross-section with a groove is considered to be the optimal section while the shallow serrated square cross-section the most unfavorable section. Groove in proper place is beneficial to wind-resistant.Wind tunnel test of mutli-point synchronous pressure measurement on rigid model of a high-rise building was conducted. Considering the interference effects of the surrounding buildings, the wind load time history of 24 wind directions was obtained by wind tunnel tests. The quality and stiffness of each layer of this high-rise building were extracted from SATWE model, and a simplified layer model was formed based on finite element theory. Each structure layer had two translational degrees of freedom without taking the reverse into account. By wind vibration time-history analysis, the displacement and acceleration response of the building were studied. It is found that due to the large cross wind effect at 90°and 105°wind direction, the maximum synthesis acceleration of top floor are 16.54 cm/s2 and 16.83 cm/s2, which are greater than specification 15 cm/s2). Therefore it is necessary to conduct wind vibration control to improve and enhance its wind-induced vibration comfort.In this study, the crosswind vibration control of the buildings was conducted by using tuned liquid damper (TLD). The deep theory was employed to derive water-structure interaction equations. By analyzing of the water depth ratio, frequency ratio, mass ratio, TLD installation location and other parameters on the damping effect, the best TLD design program was obtained. The results show that the top layer's acceleration responses are reduced to 13.37 cm/s2 (90°) and 12.01 cm/s2 (105°) by means of structure vibration control with TLD installed on the top layer. The maximum synthesis acceleration of the top layer is 13.95 cm/s2 (15°), which is consistent with the regulatory requirements. Thus, the wind induced vibration comfort and security can be greatly enhanced by applying TLD to control the wind vibration.