Theoretical Analysis And Software Development Of Wind-induced Responses On Buildings And Structures

In China, high-rise buildings and long-span structures have been greatly developed in the last twenty years with the development of Chinese economy. At the same time, the architectural appearances of structures become more and more complex. The current status and future trend of this development causes urgent need of the computer applications on structure analysis. The wind-induced dynamic responses are important even decisive for high-rise buildings and long-span structures. But in《Load code for the design of building structures》(GB50009—2001), the computing tables of wind dynamic response factors are calculated according to regular and symmetrical buildings, which are not applicable to irregular or non-symmetrical buildings. Therefore, it is necessary to develop a sort of applicable analyzing software to calculate the wind-induced responses on high-buildings and long-span structures.Based on the PKPM structural analysis software series and random vibration theory, wind-induced response calculation software is developed in this dissertation, which can calculate the along-wind equivalent static wind loads and criterion measure of inhabitant comfort. Effectiveness and precision of the software are verified by calculating the wind responses of several representative high-rise buildings. We can find that in the case of regular high-buildings the results using both the Chinese load code and the computer software are closer, while in the case of irregular high- rise buildings there is a difference up to 15% between the two methods. This clearly shows that it is necessary to consider the contribution of multiple modes in acceleration calculation, especially to the high- rise buildings with complex architectural appearance.In addition, formulae for wind-induced dynamic response and wind Vibration factors of cantilevered roofs on stadiums have also been derived in this dissertation. In the calculation of equivalent static wind load in the project of Beijing Workers Stadium maintain, power spectrum densities of fluctuating pressure are first tranSformed from the data obtained in Wind tunnel test. The result shows that wind vibration factors calculated with measured power spectrum densities are more accurate than those calculated with the Davenport spectrum, and the former results have been applied in the designs.Based on RMS (root mean square) value of along-wind displacement, which is derived from random vibration theory, the along-wind equivalent wind loads are obtained and used in《Load code for the design of building structures》(GB50009--2001). In《Technical specification for steel structure of tall buildings》(JGJ99-98) the maximum along-wind acceleration of tall buildings is calculated according to along-wind equivalent wind loads, and this method is not accurate in theory. In this dissertation, the equation of maximum along-wind acceleration is derived from random vibration theory and correlative factors are calculated respectively with background and resonant response method and numerical integral method. Compared with the method of JGJ99-98, we can find that there is a difference of about 10% between these two methods on tall buildings.