Research Of The Form Of High-rise Building Under The Influence Of Wind

Based on the analysis of the mutual influence between tall buildings and crosswind, this thesis puts forward the strategy for optimizing the form of high buildings as well as crosswind, and further proposes a standard for evaluating high-rise buildings that takes consideration of crosswind based on a study of the standards for evaluating green architecture. Finally, the practicability of this strategy is validated in this thesis.Because of their heights and volumes, high-rise buildings seriously obstruct the flows of winds in their building lots. Airflows of different types are formed around when the wind hits a high-rise building. These airflows interact each other, which lead to the complexity and disordering of crosswinds in the vicinity of the high-rise building. High-rise-induced winds greatly influence both internal and external environments: to the external environment, these winds harm the amenity of pedestrians on the streets as well as normal activities in public outdoor spaces like city squares; to the internal environment, as regional flows are very strong, high-rises are highly closed, so it is difficult to realize natural ventilation, which affects the health and emotions of high-rise users. Moreover, wind loads produced by high-rise-induced winds are serious challenges to the structures of high-rise buildings.However, the status of crosswind environment of high-rise buildings is closely related to the forms of the buildings themselves, so changing the forms of the buildings can lead to the optimization of the crosswind environment. Basing on the traditional designs of high-rises, changes to the plans, elevations and corners can well optimize the crosswind environment. With the emerging of the nonlinear design concept, the approach for optimizing crosswind environment is extended. Many designers take the wind as a significant factor from the beginning of their designs, and "generate" forms of buildings that can adapt to the wind environment.In order to determine the practicability of the strategy of optimization in actual projects, quantitative and scientific standards are in need to evaluate the results of optimization. On the basis of green building assessment system, the evaluation system for wind environment can be summarized, so that the status of wind environments in the process of architectural designs and actual operations can be evaluated. In the subsequent usage of buildings, this evaluation system can be revised and improved, and then continue to instruct the optimization design of the wind environment.