荷载对钢-混凝土连接锈蚀栓钉力学性能影响研究

Research on mechanical properties of load on steel-concrete corroded

为了研究荷载对钢-混凝土连接栓钉锈蚀程度对其力学特性的影响,对不同锈蚀程度的栓钉连接件的进行荷载试验。根据钢筋的锈蚀原理,利用人工方法加速钢-混凝土的栓钉锈蚀,为荷载试验提供达到相应的锈蚀程度样品,并通过荷载试验分别对四组样品进行极限承载力和变形特性展开研究。由试验结果可知:若栓钉连接件的钉杆发生锈蚀,尤其当锈蚀出现在靠近结合面处,该栓钉连接件的承载力以及变形特性均会受到影响;而且栓钉的锈蚀程度越大,其承载力则越低;当栓钉锈蚀质量损失率达到20.8%时,其极限承载力降低了17%;栓钉连接件大头端部锈蚀质量损失率约20%时,极限承载力下降仅为3%。研究结果为钢-混凝土的试验设计、施工使用等提供参考。

In order to study the effect of load on the corrosion degree of steel-concrete connection bolts and its mechanical characteristics, the load tests were performed on bolt-nail connectors with different degrees of corrosion. According to the corrosion principle of steel bars, manual method methods are used to accelerate the corrosion of steel-concrete studs, and samples for the corresponding degree of corrosion are provided for the load test. The ultimate bearing capacity and deformation characteristics of the four groups of samples are studied through load tests. The test results show that if the nail rod of the bolt-and-nail connector rusts, especially when the corrosion occurs near the joint surface, the bearing capacity and deformation characteristics of the bolt-and-nail connector will be affected. And the greater the degree of rust of the stud, the lower its bearing capacity. When the rate of mass loss of corroded nails reached 20.8%, its ultimate bearing capacity was reduced by 17%;when the rate of mass loss of corroded big head ends of bolts was about 20%, the ultimate bearing capacity dropped only 3%.The research results provide reference for the experimental design and construction of reinforced concrete.