Wind Load Characteristics And Measuring Points’partition And Optimization Of Large-span Roof Structure Group

In recent years, large-span roof structures are widely used in most public places and sports centers. These structures are light in weight and small in damping. When they are in the atmosphere of low turbulence, the wind-induced vibration is obvious, which often causes wind damages. Therefore, many scholars and designers of long-span roof structures have done a lot of research. However, researches on wind pressure distribution under the influence of a number of large span roof structures are much less. And ball roof structure is a new style, of which the wind pressure distribution is slightly different from that of other types. Since the large-span roof structures can influence each other and the ball flat roof structure is particular, the research of their wind pressure distribution is necessary.When offering the structure wind load for designing institute, we can accurately get the equivalent wind load from the measuring points. But it brings great inconvenience because of the various measuring points. And load inputting is more troublesome. So we partition the structures and then give the partition wind load on structures, which can reduce a lot of work. But a certain partition principle must be provided. Wind load will be calculated from partition structure and it also can be given according to the measured points. One problem that should be paid attention is whether they are equivalent or not.When partition average wind load of structure is given, some representative points from each partition can be chosen. Those points can represent the average wind pressure of each partition. According to traditional combination method to select the representative points is time-consuming. But when uniform design method is cited, test time can be significantly reduced and the process is much easier.This thesis takes Wuhan University of Science and Technology sports center as engineering background. The sports center contains a stadium, natatorium and gymnasium. The rigid model wind tunnel test for the sports center was conducted. Based on the experimental data, the study on the wind-resistant analysis and design of large span roof structure group is showed. The study mainly considers the feature of wind pressure distribution and shape coefficient. In addition, the high roof of the stadium is used to be an example; it shows the principle of partition and equivalence evaluation. Stress states of the two loading modes before and after partition are compared. After using uniform design method to choose partition representative points, the partition wind pressure and equivalent wind load can be obtained according to all points and representative points in one partition. The difference is easily seen. Time history analysis method is used to calculate wind-induced vibration response of the high roof of stadium, and then the time history analysis result and that of static analysis are compared.