摘要
金属屋面系统上存在大量连接铝合金基材的自钻自攻螺钉,在金属屋面风揭破坏案例中有螺钉被拔出的事故。为研究连接铝合金基材的不锈钢复合材质自钻自攻螺钉的抗拉拔性能及计算方法,进行了以钻入方式、基材厚度、螺距、螺钉直径为变量的198个连接试件抗拉拔试验,通过试验结果分析不同因素对抗拉拔承载力的影响。结果显示:连接铝合金基材的自钻自攻螺钉的抗拉拔承载力与基材厚度、螺距、螺钉直径呈正相关;使用手动电钻将螺钉钻入基材时,螺距较小的试件容易受到施工影响导致抗拉拔承载力下降。将得到国内外标准中算式的试验值与计算值进行对比,对连接铝合金基材的自钻自攻螺钉的抗拉拔承载力计算式进行改进,改进后算式得到的计算值与试验值拟合较好。
Large numbers of self-tapping screws are used to fix aluminum sheets in the metal roofing system where the pull-out accidents of screw connections were reported frequently subjected to the wind uplift loads.In order to study the pull-out characteristics and presented a calculation method of self-tapping stainless steel screws to connect aluminum sheets,tensile tests of 198 connected specimens with different drilling methods,thicknesses of aluminum sheets,pitch and major diameters were conducted.Based on the results,the influences of different factors on the pull-out characteristics of self-tapping screws fixed aluminum sheets.The results indicated that the pull-out bearing capacity increased with the increase of aluminum sheet thickness,pitch and major diameters.The pull-out bearing capacity of specimens for carbon steel screw was better than that for stainless steel screw.The specimens with small pitch was susceptible of construction,which affected the pull-out bearing capacity.The test results were compared with the calculated results from the formulas recommended by codes of home and abroad.The formula for pull-out bearing capacity of self-tapping screws to fix aluminum sheets was modified.The results calculated by the modified formula fitted well with the test results.
作者
辛志勇
潘步新
汪大洋
张永山
朱勇
XIN Zhiyong;PAN Buxin;WANG Dayang;ZHANG Yongshan;ZHU Yong(Zhuhai Envete Engineering Testing Co.,Ltd.,Zhuhai 519120,China;School of Civil Engineering,Guangzhou University,Guangzhou 510006,China;Guangdong Metal Enclosure Structure Engineering Technology Research Center,Guangzhou 510006,China)
出处
《工业建筑》
CSCD
北大核心
2021年第1期100-109,共10页
Industrial Construction
基金
广东省自然科学基金项目(2020A1515010993,2015A030313511)。
关键词
不锈钢螺钉
自钻自攻
铝合金基材
拉拔承载力
计算式
carbon steel screw
self-tapping
aluminum sheet
pull-out bearing capacity
calculating equation
作者简介
第一作者:辛志勇,男,珠海安维特工程检测有限公司总经理,广东省建筑金属围护结构系统工程技术研究中心1975年出生,高级工程师;通信作者:潘步新,男,硕士研究生,418440996@qq.com。
