杭绍台铁路站房金属屋面抗风揭试验研究

Experimental Study on Wind Resistance of Metal Roof in Hangzhou-Shaoxing-Taizhou Railway Station

以杭绍台铁路站房金属屋面为研究对象,通过抗风揭试验,明确其失效模式和抗风揭承载力,并探讨不同参数对直立锁边金属屋面抗风揭性能的影响。研究结果表明:直立锁边金属屋面在风吸力作用下主要的破坏模式是锁边处屋面板与支座的脱扣破坏;改变支座高度、檩条间距、布置抗风夹均能提高直立锁边金属屋面的抗风揭性能,其中布置抗风夹效果最为显著;高强抗风夹能转变金属屋面系统的失效模式,较常规抗风夹而言,能大幅提高屋面板抗风承载力;动态循环加载对直立锁边金属屋面的极限承载力存在着明显的影响,在实际工程中进行动态循环抗风揭试验是十分有必要的。

Taking the metal roof of Hangzhou-Shaoxing-Taizhou Railway Station as the research object,through the wind resistance test,its failure mode and wind resistance were determined,and the effects of different parameters on the wind resistance of standing seam metal roof were discussed,the results showed that the main failure mode of the standing seam metal roof under wind suction was trip-out failure between the roof panel at seams and bearings.changing the bearing height,purlin spacing and arranging the anti-wind clip could improve the wind resistance of the metal roof with standing seams,and the effect of arranging the anti-wind clip was the most significant.The high-strength wind resistance clamp could change the failure mode of metal roofing system and greatly improve the wind bearing capacity of roof panel compared with the conventional wind clamp.Dynamic cyclic loading had an obvious influence on the ultimate bearing capacity of metal roof with standing seams.It is very necessary to carry out dynamic cyclic wind resistance test in practical engineering.