压型钢板-UHPC组合连接件抗剪性能试验研究
万家恺 , 马晨雨 , 田知典 , 程小亮 , 张号军 , 朱爱珠
建筑钢结构进展 ›› 2026, Vol. 28 ›› Issue (7) : 65 -72.
压型钢板-UHPC组合连接件抗剪性能试验研究
Shear Performance Test of Profiled Steel Sheet-UHPC Composite Connectors
为研究新型自攻螺钉连接的压型钢板-超高性能混凝土(ultra-high performance concrete, UHPC)组合连接件的抗剪性能,对15组组合连接件开展了推出试验研究,测试并分析了自攻螺钉的直径、埋深、埋深与直径比值(长径比)及间距等参数对连接件抗剪承载性能的影响。试件所用压型钢板厚度为1.2 mm。结果表明:自攻螺钉直径、长径比对连接件的破坏模式与抗剪承载力影响显著;当螺钉直径较小(4.2 mm、4.8 mm)时,螺钉的横截面相对较小,连接件发生自攻螺钉剪断破坏;当螺钉直径较大(5.5 mm、6.3 mm)时,螺钉抗剪承载力提高,压型钢板因厚度较小,孔壁压屈失效先于螺钉剪断,连接件以钢板孔壁承压-螺钉剪切组合失效为主,建议螺钉直径不小于4倍板厚。连接件的抗剪承载力随螺钉埋深增大总体呈上升趋势;当螺钉直径较大(6.3 mm)或螺钉直径与板厚比值较大时,连接件的抗剪承载力主要由孔壁承压强度控制;螺钉埋深与直径比值不小于3.52时,未发生拔出失效;螺钉间距与直径比值超过7.0时,间距对连接件抗剪承载力影响较小。对比现行相关规范中连接件的计算方法可知,《冷弯薄壁型钢结构技术规范》(GB/T 50018—2025)与Eurocode 4中对螺钉剪切失效承载力的预测方法可较好预测自攻螺钉的剪切破坏承载力。
To investigate the shear performance of novel profiled steel sheet-ultra-high performance concrete (UHPC) composite connectors fastened by self-tapping screws, 15 groups of push-out tests were conducted on the composite connector specimens. The effects of screw diameter, embedded depth, embedded depth-to-diameter ratio, and screw spacing on the shear-bearing performance of the connectors were tested and analyzed. The thickness of the profiled steel sheets used in the specimens was 1.2 mm. The test results show that the screw diameter and embedded depth-to-diameter ratio of self-tapping screw have a significant impact on the failure mode and shear-bearing capacity of the connectors. When the screw diameter was small, such as 4.2 mm and 4.8 mm, the cross-sectional area of the screw was relatively small, and shear failure of the self-tapping screw occurred. When the screw diameter was larger, such as 5.5 mm and 6.3 mm, the load required for screw shear failure increased due to the larger screw diameter. In contrast, because the profiled steel sheet was relatively thin, bearing buckling failure of the hole wall occurred before the screw shear failure, resulting in a combined failure mode of screw bearing and screw shearing. It is recommended that the screw diameter should be no less than four times the steel sheet thickness. The shear-bearing capacity of the connector generally increased with the embedded depth of the screw. However, when the screw diameter was large (6.3 mm) or the ratio of screw diameter to sheet thickness was large, the shear-bearing capacity of the connector was mainly governed by the bearing strength of the hole wall. No screw pull-out failure occurred when the embedded depth-to-diameter ratio was not less than 3.52. When the screw spacing-to-diameter ratio exceeded 7.0, the shear-bearing capacity of the connector was less sensitive to the screw spacing. A comparison among the calculation methods in current relevant codes showed that the bearing capacity prediction methods for screw shear failure in Technical code of cold-formed thin-wall steel structures(GB/T 50018—2025) and Eurocode 4 can reliably predict the shear-bearing capacity of self-tapping screws in the profiled steel sheet-UHPC connectors.
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