为研究不锈钢-木组合梁不锈钢螺栓连接件的抗剪性能,设计4个推出试验试件并开展了试验研究,得到了连接件的破坏模式以及相关力学性能.将试验结果分别与《木结构设计标准:GB 50005-2017》和《EN 1995-1-1:2004+A1:Eurocode 5:De-sign of timber structures.Part 1-1:General Common rules and rules for buildings》中承载力计算方法进行了对比分析.结果表明:不锈钢-木组合梁不锈钢螺栓连接件的破坏模式主要为木材劈裂破坏,产生沿螺栓间距方向的纵向贯穿裂缝,不锈钢螺栓发生受弯变形并屈服.螺栓间距的增大能够提高初期刚度、延性与极限承载能力,但会使试件更早进入屈服状态,且在达到80%极限承载力时剪切滑移刚度发生大幅度退化.GB 50005-2017的计算结果偏于保守,EN 1995-1-1:2004+A1在考虑抗拔效应后计算结果接近试验值的80%,可作为不锈钢-木组合梁不锈钢螺栓连接件抗剪承载力设计参考.
Research on the Shear Performance of Stainless Steel Bolted Connections in Stainless Steel-timber Composite Beams
To investigate the shear performance of stainless steel bolt connectors in stainless steel-timber composite beams,four push-out test specimens were designed and experimental research was conducted.This resulted in the identification of the connectors'failure modes and associated mechanical properties.The test results were compared and analyzed against the load-bearing capacity calculation methods outlined in"GB50005-2017:Wood Structure Design Standard"and"EN 1995-1-1:2004+A1:Eurocode 5:Design of Timber Structures.Part 1-1:General Common Rules and Rules for Buildings."The results indicated that the primary failure mode of the shear performance of stainless steel-wood composite beam bolted connections was wood splitting,characterized by longitudinal cracks along the bolt spacing direction,and shear deformation and yielding of the stainless steel bolts.An increase in bolt spacing enhanced the initial stiffness,ductility,and ultimate load-bearing capacity but led to earlier yielding of the specimens.Additionally,a significant reduction in shear sliding stiffness occurred upon reaching 80%of the ultimate load-bearing capacity.The calculations based on GB50005-2017 were conservative,while those from EN 1995-1-1:2004+A1,after considering the anti-pulling effect,were close to 80%of the experimental values,making them a viable reference for the design of shear-bearing capacity in stainless steel-timber composite beam bolted connections.
stainless steel-timber composite beamshear connectorslaunch the experimentshear slip stiffnessshear capacity
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