机械固定式单层卷材屋面系统关键连接节点抗拔性能试验研究
郝勇 , 丁秋雨 , 武航飞 , 周垠 , 徐怀兵 , 周占学
建筑钢结构进展 ›› 2026, Vol. 28 ›› Issue (8) : 55 -64.
机械固定式单层卷材屋面系统关键连接节点抗拔性能试验研究
Experimental Study on Pull-Out Performance of Key Connection Joints in Mechanically Fixed Single-Ply Membrane Roofing Systems
为研究风吸力作用下易发生破坏的机械固定式单层卷材屋面系统关键连接节点的抗拔性能,将0.8、0.9、1.0、1.1 mm四种厚度的Q235压型钢板分别与两种类型长螺钉组合,开展了8组共计24个试件的静力拉拔试验。分析了长螺钉-压型钢板连接的破坏机理、抗拔承载力的影响因素以及国内外规范中螺钉抗拔承载力计算公式的适用性,最后对某游泳馆屋面在各等级风力作用下的抗风揭安全性进行评估。结果表明,螺纹宽度相同时,长螺钉-压型钢板连接的抗拔承载力随着板厚的增加而呈非线性增大。螺纹宽度的增加对薄板试件抗拔承载力的提升作用比对厚板试件抗拔承载力的提升作用更显著。采用欧洲标准计算螺钉抗拔承载力的结果偏于保守;对于深螺纹长螺钉-压型钢板连接,澳洲标准计算值最接近试验值。对于浅螺纹长螺钉-压型钢板连接,中国规范计算值最接近试验值,而按澳洲标准计算则偏于不安全。游泳馆屋面在0~14级风作用下不会发生风揭破坏,而当风力大于14级后,长螺钉将被拔出,屋面系统将发生风揭破坏。
To study the pull-out performance of key connection joints in mechanically fixed single-ply membrane roofing systems which are prone to damage under the action of wind uplift, Q235 profiled steel plates with four thicknesses of 0.8, 0.9, 1.0, and 1.1 mm were combined with two types of long screws respectively, and static pull-out tests were carried out on twenty-four specimens in eight groups. The failure mechanism of long screw-profiled steel plate connections, the influencing factors of pull-out bearing capacity, and the applicability of the calculation formula of screw pull-out bearing capacity in Chinese and international codes were analyzed, Finally, the wind-uplift safety of a natatorium roof under different wind force levels was evaluated. The results show that when the thread width is the same, the pull-out bearing capacity of the long screw-profiled steel plate connection increases nonlinearly with the increase of the plate thickness. The increase in thread width has a more significant effect on the pull-out bearing capacity of thin plate specimens than on that of thick plate specimens. The calculation results of European standards are too conservative. For deep-thread long screw-profiled steel plate connections, the Australian standard calculation values are closest to the test values. For shallow-thread long screw-profiled steel plate connections, the calculated values of Chinese code are closest to the experimental value, while the calculation according to the Australian standard is unsafe. The natatorium roof will not suffer wind-uplift failure under wind forces of grades 0~14. When the wind force exceeds grade 14, the long screws will be pulled out, and wind-uplift failure will occur in the roofing system.
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