昌北机场直立锁边金属屋面板抗风揭试验研究

EXPERIMENTAL STUDY OF WIND UPLIFT RESISTANCE ON METAL ROOF PANELS WITH STANDING SEAM SYSTEMS AT CHANGBEI AIRPORT

近年来,轻便、大跨、强度高、防水性能好的直立锁边金属屋面系统越来越多地应用于机场、火车站和体育馆,但由于缺乏相应设计和施工标准,其抗风承载力不足的弊端也逐渐体现出来。以昌北机场T2航站楼金属屋面修复加固工程为研究背景,通过足尺试验对直立锁边金属屋面板进行抗风揭性能试验和评价。通过分析不同加固模式下的金属屋面板抗风揭破坏形态和承载力变化规律,确定直立锁边金属屋面系统的合理加固措施。试验结果表明,采用夹具进行加固可以有效地提高HXY-400型直立锁边金属屋面板的抗风揭承载力,其抗风揭承载力较未设夹具的屋面板抗风揭承载力提升4.18倍;檩条间距、檩条连接件抗剪承载力及檩条自身抗弯能力对于直立锁边金属屋面板的抗风揭承载力有着直接影响。

The standing seam metal roof system has the advantages of light weight,large spans,high strength and good waterproof performances.Therefore,it was increasingly used in airports,train stations and stadiums.However,due to the lack of the corresponding design and construction specifications,the disadvantage of the insufficient wind uplift resistance was gradually reflected.Taking the repair and reinforcement project of metal roofs for terminal T2 at Changbei Airport as the research background,the wind uplift resistance of metal roof panels with standing seam systems was tested and evaluated by full-scale tests.The reasonable reinforcement measures of the metal roof with standing seam systems were determined by analyzing failure modes of wind uplift and variation rules of wind uplift resistance for the metal roof panels with standing seam systems in different reinforcement modes.The test results showed that the clamps could effectively improve the wind uplift resistance of HXY-400 standing seam metal roof panels,and its wind uplift resistence was 4.18 times higher than that of the roof panels without clamps.In addition,purlin spacing also had a direct impact on the wind uplift resistance of standing seam metal roof panels.