直立锁边屋面系统风揭破坏全过程试验研究

At present, there are many different test standards for evaluating the wind-resistant performance of metal roof system, which brings inconvenience to engineering design. Based on ANSI/FM 4474-2004, ETAG 006: 2007 and CSA A123. 21-04, static and dynamic wind-resistant tests were carried out on the same type of standing seam roof system. Through the tests, the failure mode, bearing capacity and damage of the roof system were obtained, and the effects of test methods on the wind-resistant performance of the roof system were further compared. The comparative study shows that the test methods have obvious effects on the failure mode and bearing capacity of the roof system. Under the static loading, the roof system is more prone to experience occlusion failure, while under the dynamic loading, the roof system is more likely to experience tearing failure. At the same time, the more number of cycles that a load level contains, the smaller the load value when the roof system occurs tearing failure. Therefore, it is very important to determine the number of cycles based on the wind load characteristics of the region. In addition, the damage of the roof system in the wind uplift failure process was compared, and it is found that the roof systems tested using different methods all experience contact impressions, obvious rotation of anti-wind clip, partial separation of curling and permanent plastic deformation. Therefore, it can be concluded that the test method has little effect on the failure process of the roof system.