锁铆连接在模块化装配式冷弯薄壁型钢结构中应用可行性研究

Feasibility Research on Self-piercing Rivet Connections Used in Structure Prefabricated Modularly With Cold-formed Thin-walled Steel

为了解决锁铆技术在装配式冷弯薄壁型钢结构中应用的问题,采用5种常见厚度的冷弯薄壁型钢锁铆连接及自攻螺钉连接进行了抗剪性能、抗拉性能对比试验;以自攻螺钉连接的性能为标准,依据抗剪与抗拉的承载力、刚度、延性、变形量等性能指标分析了锁铆连接力学性能的可行性;基于冷弯薄壁型钢结构房屋工地建造方式及锁铆连接工艺的特殊性,分析了锁铆连接施工可行性.研究结果表明:同等情况下,锁铆连接的抗拉性能指标及抗剪承载力、抗剪刚度、剪切延性均优于自攻螺钉连接,尤其抗剪刚度优势显著,但剪切变形相对较小;锁铆连接应用于非抗震结构中可行性较大,对于有抗震需求的结构可行性有待进一步验证;锁铆仅适用于工厂生产加工的模块化装配式冷弯薄壁型钢结构体系,且被连接的钢板组合厚度不宜大于4 mm.

To solve the application problem about self-piercing rivet(SPR)technique used in prefabricated cold-formed thin-walled steel structure,for SPR and self-drilling screw connections of cold-formed thin-walled steel sheet with five common thicknesses,the comparison tests of shear and tension performance were conducted.On the basis of the performance of the self-drilling screw connection,the feasibility of mechanical properties of SPR connection was analyzed according to the shearing and tensile performance index comprised of bearing capacity,stiffness,ductility,deformation and so on.Based on the constructing method of construction sites for cold-formed thin-walled steel structures and the particularity of SPR technique,the construction feasibility of SPR connection was also analyzed.The results showed that in same condition for SPR connection,the performance index of shear and tension such as bearing capacity,stiffness,ductility and so on are better than self-drilling screw connection,especially in shear stiffness,however,the shear deformation is relatively small.The application of SPR connection in non-seismic structure is more feasible,but it needs a further study for seismic structure.In addition,SPR is only apply to modular prefabricated cold-formed thin-walled steel structure system that is industrially produced and machined,as well as the combination thickness of steel plate should not be go over4mm.